Direct Recruitment Examination of TTA
[ Kerala Circle] July 2013
Max Marks 200 Time
Allowed 3 Hours
I General Ability Test [20 Questions of each Mark]
II Basic Engineering [90 Questions of each Mark]
III Specialization [90
Questions of each Mark]
·
Candidates have to answer all Questions
·
There will be negative marking. For each wrong answer 25% of
the mark of that question will be deducted.
11. The smallest number
which when divided by 20,25,35 and 40 leaves remainders as of 14,19,29
and 34 respectively is:
a.
1394 b) 1404 c) 1664 d) 1406
22. Raju reads 3/5 of a book. He finds that there are still 80
pages left to be read. Total number of pages in the book are:
a.
100 b. 200 c. 300 4. 400
33. Indian cricket team won 4 more matches than it lost with Australia. If
it won 3/5 of its matches, how many matches did India play?
a.
8 b. 12 c. 16 d.
20
44. A man pays 40 times the annual rent to purchase a building.
The rate % per annum he derives from his investment is:
a.
25% b. 2.5% c. 4% d. 5%
55. The cost of 3 pens, 4 rulers and 5 erasers is Rs. 75 while
that of 10 erasers, 6 pens and 7 rulers is Rs 138, find the cost of 3 pens, 1
ruler and 5 erasers.
a.
Rs.39 b. Rs.42 c. Rs 44 d.
Cannot be found
66. If a:b=3:7, find the value of (5a+b) : (4a+5b)
a.
15:44 b. 22:35 c. 15:49 d. 22:47
77. A can do a piece of work in 20 days and B in 30 days. A
starts the work and worked for 6 days. Then B completed the remaining part of
the work. In how many days was the work completed?
a.
24 b.27 c. 32 d.
34
88. A train covered a distance of 250 km, partly at an average
speed of 40 km/hr and partly at 60 km/hr. Find the distance covered at 40 km/hr
if it took 5 hours to cover the distance.
a.
150km b.120km c.100km d. cannot be found
99. For which of the following disciplines is Nobel Prize
awarded?
a.
Physical and Chemistry b.
Physiology or Medicine c. Literature, Peace and Electronics d. All of the Above
110.
Which is the least populated state in the Indian Union?
a.
Arunachal Pradesh
b. Goa C. Meghalaya d. Sikkim
111.
The highest Indian decoration for showing valour and
gallantry in the war is
a.
Param Vishishta Seva Medal
b. Ashoka Chakra C. Paramveer Chakra d. Mahaveer Chakra
112.
Through which states does the river Chambal flow?
a.
UP, MP and Rajasthan b.
MP, Gujarat and UP c. Rajasthan, MP and Bihar d.
Gujarat, Haryana and UP
113.
Where is the Headquarters of World Trade Organization (WTO)
situated?
a.
Geneva b. Paris c. Washington
DC d.
Nairobi
114.
What is the currency of China?
a.
Yen b. Chinese
Dollar c. Yuan d. Baht
15.
Select the choice that provides the best meaning of the word
“monetary”
a.
Fiscal b. Stationary c. Scrupulous d. boring
16.
Select the choice that provides the best meaning of the word
“ Nascent”
a.
Loyal b. treacherous c. unnamed d. incipient
17.
Select the choice that provides the best meaning of the word
“Chaste”
a.
Curf b. Pure c.
Outspoken d.
loyal
18.
Select the choice that provides the opposite meaning of the
word “deter”
a.
Encourage b.
differ C. postpone d. prorogue
19.
Select the most effective word from the choice to fill in
the blanks to make the sentence meaningfully complete.
Ram agreed to ………………….. my
orders
A. Carry away b. Carry on c.
carry out d. carry off
20. Select the most effective word from
choice to fill in the blanks to make the sentence meaningfully complete.
If a speech
is full of pompous, it is ………………….
A. verbose b. grandiose c. bombastic d.
grandiloquent
Part II
- Which of the following is
conserved when light waves interfere with each other?
- Energy b. Intensity c. Amplitude d.
Momentum
- When n resistances each of
value r are connected in parallel, then resultant resistance is x. When
these n resistances are connected in series, total resistance is
- nx b. rnx c. x/n d. n2x
- Two bulbs marked 200 watt-250
volts and 100 watt-250 volts are joined in series to 250 volts supply.
Power consumed in circuit is
- 33 watt b.67watt c. 100 watt d.
300 watt
- Which of the following
capacitors is polarized?
- Mica b. Ceramic c.
Plastic film d. Electrolytic
- A 4.7 M W resistor is in series with a 0.015 mF capacitor. The combination is across a 12 V source.
How long does it take the capacitor to fully charge?
- 35 ms b. 352 ms c.
3.5s d. 70.5 ms
- A sine wave voltage is applied
across a capacitor. When the frequency of the voltage is decreased, the
current
- Increases b. remains constant c. Decreases d. ceases
- Three 10 KW resistors are connected in series. A 20kW resistor is connected in parallel across one of the
10kW resistors. The voltage source is 24 V. the total
current in the circuit is
- 900 mA b. 9mA c.
90 mA d. 800 mA
- A certain circuit is composed
of two parallel resistors. The total resistance is 1,403W. One of the resistors is 2W. The other resistor value is
- A. 1,403W b.
4.7 kW c. 2 kW d. 3,403 W
- A 33W half-watt resistor and a 330W half-watt resistor are connected across a 12 V source.
Which one(s) will overheat?
- 33W b. 330W c.
both resistors d. neither
resistor
- A certain appliance uses 350 w.
If it is allowed to run continuously for 24 days, how many kilowatt-hours
of energy does it consume?
- 20.16 kWh b. 201.6 kWh c. 2.01kWh d. 8.4 kWh
- A Power supply produces a 0.6 W
output with an input of 0.7 W . Its percentage of efficiency is
- 8.57% b. 42.85% c.
4.28% d. 85.7%
- A 6V battery is connected to a
300W load. Under these conditions, it is rated at 40 Ah.
How long can it supply current to the load?
- 1 hr b. 200 hrs c.
2000 hrs d. 10 hrs
- Doppler shift in frequency does
not depend on
- The speed of the observer
- The speed of the source
- The relative speed of the
observer with respect to source
- The distance between the
source and the observer
- The amplitude of light wave at
a distance x is A. At a point distant 3x from the source, the amplitude
would be
- 9A b. 3A c. A/3 d. A/9
- Korchoff’s laws are not
applicable to circuits with
- Distributed parameters
- lumped parameters
- passive elements
- non-linear resistances
- Cells are connected in series
in order to increase
- Current capacity
- Life of the cells
- Voltage rating
- Terminal voltage
- In lead acid batteries
- The electrolyte is weak
sulphuric acid
- The number of plates is always
odd
- The number of negative plates
is one more than the number of positive plates
- All of the above
- The rating of fuse wire is
always expressed in
- Volts b. amperes c.
ampere volts d.
ampere hours
- The thickness of insulation provided
on the conductor depends upon
- Current rating b. voltage rating c.
both A. and B. d. none of
these
- When two cells are connected in
parallel, it should be ensured that they have
- Identical internal resistances b. equal emfs c. same make d. same ampere-hour capacity
- Which cannot be calculated
using the principle of conservation of energy?
- The energy of a proton at
rest
- The production of back emf in
a motor
- Voltage transformation in an
ideal transformer
- The escape velocity of an
object from the gravitational field of a planet
- Why does superconductivity
acquire in certain materials at low temperatures
- At low temperatures there are
no lattice vibrations
- Some pairs of electrons
experience net attractions at low temperatures
- The materials allow loose
resistance at low temperatures
- At low temperatures the
materials become magnetic and this reduces the scattering of electron
pairs
- Specific resistance is measured
in
- Mho b. ohm c.
ohm-cm d. ohm/cm
- The equation of alternating
current is i=42.4 sin 628t. Then the average value of current is
- 42.42A b. 27A c. 38A d. 22A
- Which of the following case
represents the largest mmf?
- A 20 turn coil wound around a
10cm iron core and passing a current of 3A
- A 60 turn coil wound a 10cm
iron core and passing a current of 1 A
- A 100 turn coil wound a 10cm
iron core and passing a current of 0.75A
- A 50 turn coil wound a 10cm
iron core and passing a current of 0.75A
- The slope of line perpendicular
to 2x+y=0 is
- ½ b. -1/2 c. 2 d. -2
- The line passing through (2,3)
and (3,2) is
- X+y-5=0 b. x-y-1=0 c.
x+y+1=0 d. x-y+1=0
- Equation of circle passing
through origin and center(a,0) on x axis with radius ‘a’ is
- (x-a)2 + y2 =a2 b. x2-y2-2ax=0 c. both A and B d. neither of above
- The angle made by the line
x-y+5 =0 with y-axis is
- 30 degree b. 45 degree c. 60 degree d. 150 degree
- The angle covered by a wheel in
3 sec, if it makes 200 revolutions in a minute, is
- 10π b. 15 π c.
20 π d. 30 π
- If Ѳ=450 =, then sec Ѳ cot Ѳ – cosec Ѳ tan Ѳ =
- 0 b. 2 c.
√2 d. 2√2
- Which of the following is not
an example of a vector?
- Displacement b. Momentum c. Mass d. Angular velocity
- The sum of two unit vectors is
a unit vector. The magnitude of their difference is
- 2 b. √3 c.
√2 d. 1
- Rank of the matrix 1 -2 3 is
2 4 1
1
2 7
a) 1 b) 2 c) 3 d) none of these
35. Matrix
A = cos Ѳ -sin Ѳ is
Sin
Ѳ cos Ѳ
a) orthogonal matrix b) reciprocal matrix c) transposed matrix d) second order non-linear
36. Differential
equation d2y / dx2 + sinx dy/dx + yex
= sinhx is
A. First order and linear
B. First order and non-linear
C. Second order linear
D. Second order non-linear
37. Which of the following equations has
the same graph as the line 3y-1.5 x = 0?
A. Y=x/3 B. y=2x+3 C.
y=2x D. y=x/2
38. If
y=xx, x > 0, then dy/dx is
A. log x B. 2+log x C.
X x log x D. X x
(1+log x)
39. d/dx
(cos -1 x + sin -1 x) is equal to
A. π/2 B. 0 C.
2 π D. None of these
40. If √x + √y = 4 then dx/dy at y=1 is
A. 3 B.
-1 C. -3 D. none of
these
π/2
41. ∫ 0 sin 4 Ѳ / sin Ѳ d Ѳ is equal to
A. 2/3 B. 8/3 C. ¾ D. 4/3
2
42. The value of ∫ 0 (x -1) |x-1| dx is equal to
A.-2/3 B. 4/3 C. 2/3 D. 0
43.
If ω is a cube root of unity, then value of (1+ ω- ω2) (1- ω+
ω2) is
A. 1 B.
0 C. 2 D.
4
44. The locus represented by | Z-1| = |Z+
i | = is
A. Circle of radius 1 B. an ellipse with foci at (1,0) and (0,1)
C. a straight line through the
origin D. a circle on the line
joining (1,0), (0,1) as diameter
45. If z is a complex number, then
A. |Z2| > |Z|2 B. . |Z2|=. |Z|2 C. |Z2|
< . |Z|2 D. none of these
46. Value of √I + √-I is
A.0 B.
+/- √2 C. –i √2 D. (-2+2i)
47. What is the most significant development
in electronics since World war II ?
A. The development of LCD TV B. The Development of the diode
C. The Development of the
transistor D.The development of
TRIAC
48. Which material may also be considered
a semiconductor element?
A. Carbon B. Ceramic C.
Mica D. Argon
49. What can a semiconductor sense?
A. Temperature B. Magnetism C. Pressure D. All of these
50. The diffusion potential across a p-n
junction
A. Decreases with increasing doping
concentration
B. Increases with decreasing band
gap
C. Does not depend on doping
concentrations
D. Increases with increase in
doping concentrations
51. Forward bias of a silicon P-N junction
will produce a barrier voltage of approximately how many volts?
A. 0.2 B. 0.3 C. 0.7 D. 0.8
52. A P-N junction mimics a closed switch
when it
A. has a low junction resistance B. is reversed biased
C. Cannot overcome its barrier
voltage D. Has a vide depletion region
53. If conductance increases as
temperature increases, this is known as a
A. Positive coefficient B. Negative current flow C. Negative coefficient
D. positive resistance
54. Which statement best describes an
insulator?
A. a material with many free
electrons B. a material doped to
have some free electrons C.
A Material with few free electrons D.
none of the above
55. What electrical characteristic of
intrinsic semiconductor material is controlled by
The addition of impurities?
A. Conductivity B. Resistance C. Power D.
All of the above
56. A JFET
A. Is a current controlled device B. Has a low input resistance
C. Is a Voltage controlled device D.
Is always forward biased
57. When transistors are used in digital
circuits they usually operate in the:
A. Active region B. Breakdown region
C. Saturation and Cut off regions D. Linear region
58. A current ratio of IC/IE
is usually less than one and is called:
A. beta B. theta C.
Alpha D. Omega
59. In a C-E configuration, an emitter
resistor is used for:
A. Stabilization B. ac signal bypass
C. Collector bias D. higher gain
60. A transistor may be used as a switching
device or as a:
a) Fixed resistor b) tuning device c) rectifier d)
variable register
61. In a class B Push-Pull amplifier, the
transistors are biased slightly above the cutoff to avoid
a) Crossover distortion b) Unusually high efficiency c) Negative
feedback
d) A low input impedance
62. Often a common – collector will be the
last stage before the load: the main function of this stage is to
a) Provide voltage gain b) Buffer the voltage amplifiers from
the low-resistance loads c)
Provide phase inversion
d) Provide a high frequency path to
improve the frequency response
63. The center frequency of a band pass
filter is always equal to the
a) Bandwidth b) -3dB Frequency
c) Bandwidth divided by Q d) Geometric average of the critical
frequencies
64. In an averaging amplifier, the input
resistances are
a) Equal to the feedback resistance b) Less than the feedback resistance
c) Greater than the feedback
resistance d) Unequal
65. The ramp voltage at the output of an
op-amp integrator
a) increase or decreases at a
linear rate b) increases or decreases at an exponential
rate
c) Is always increasing and never
decreasing d) is constant
66. What is the minimum frequency at which
a crystal will oscillate?
a) Seventh harmonic b) third harmonic c) fundamental d)
second harmonic
67. Sinusoidal oscillators operate with
a) Positive feedback b) negative
feedback
c)
Both positive and negative feedback d)
none
68. Avalanche photodiodes are preferred
over PIN diodes in optical
communication
Systems because of
a) Speed of operation b) higher sensitivity
c)
Larger bandwidth d) larger
power handling capacity
69. Very Large Scale Integration (VLSI)
A) Refers to a small computer on a
chip b) cannot be applied to MOS
systems
c) Refers to IC’s with complexity
below 100 gates d) does not require costly process facilities
70. Avalanche breakdown results basically
due to
a) Impact ionization b) strong electric field across the junction
c) Emission of electrons d) rise in temperatures
71. An ideal power supply has
a) Zero internal resistance b) very large input resistance
c) Very large output resistance d) very low output resistance
72. Higher order active filters used for
variable
a) Bandwidth b) gain in the pass band c)
impedence d) roll-off rate
73. Convert the octal number 17 to decimal
a) 22 b) 23 c) 15 d) 34
74. How many binary digits are required to
count to 100 10 ?
a) 5 b)
8 c) 7 d) 9
75. A logic circuit that provides a HIGH
output for both inputs HIGH or both inputs LOW
is
a) An EX-NOR
gate b) an OR gate c) an EX-OR gate d)
a NAND gate
76. Parity systems are defined as either
_________ or ___________ and will add an extra _______to the digital
information being transmitted
a) Positive, negative, byte b) odd, even, bit
c) Upper, lower, digit d) on, off, decimal
77. One of De Morgan’s theorems states
that X+Y = XY Simply stated, this means that logically there is no difference
between
a. a NOR
and an AND gate with inverted
inputs
b. a NAND and OR gate with inverted
inputs
c. an AND
and a NOR gate with inverted
inputs
d. a NOR
and a NAND gate with inverted inputs
78. How many gates would be required to
implement the following Boolean expression before?
Simplification? XY + (X+Z) + Y (
X+Z)
a) 3 b)
4 c) 5 d) 6
79. Use Boolean algebra to find the most
simplified SOP expression for
F=ABD+ CD + ACD + ABC + ABCD
a) F=ABD+ABC+CD b) F=CD+AD c) F=BC+AB d) F=AC+AD
80. The implementation of simplified
sum-of-products expressions may be easily implemented into actual logic
circuits using all Universal ________gates with little or no increase in
circuit
Complexity. (Select the response
for the blank space that will BEST make the statement true)
a) AND/OR b) NAND c) NOR d) OR/AND
81. A logic probe is placed on the output
of a gate and the display indicator is dim. A pulser is used on each of the
input terminals, but the output indication does not change. What is wrong?
a. The output of the GATE appears to be open
b. The dim indication on the logic probe
indicates that the supply voltage is probably low
c. The dim indication is a result of a
bad ground connection on the logic probe
d. The gate may be a tristate device.
82. How is a J-K flip-flop made to
toggle?
a) J=0, K=0 b) J=1, K=0 c) J=0, K=1 d) J=1, K=1
83. On a master – slave flip-flop, when
is the master enabled?
a) When the gate is LOW b) When
the gate is HIGH
c) Both of the above d) neither of the above
84. How can parallel data be taken out of
a shift register simultaneously?
a) Use the Q output of the first FF b) Use the Q output of the last FF
c) The all of the Q outputs together d) Use the Q output of each FF
85. Synchronous counters eliminate the
delay problems encountered with asynchronous counters
Because the:
a. Input clock pulses are applied only
to the first and last stages
b. Input clock pulses are applied only
to the last stage
c. Input clock pulses are not used to
activate any of the counter stage
d. Input clock pulses are applied
simultaneously to each stage
86. The check sum method of testing a
ROM :
a) Indicates if the data in more than
one memory location is incorrect
b) Provides a means for locating and
correcting data errors in specific memory locations
c) Allows data errors to be pinpointed
to a specific memory location
d) Simply indicates that the contents
of the ROM are incorrect
87. Which of the following consumes
minimum power?
a) TTL b) CMOS c) DTL d) RTL
88. How many select lines will a 31:1
multiplexer have?
a) 5 b) 8 c) 9 d) 11
89. Karnaugh map is use for the purpose
of
a) reducing the electronic circuits
used
b) to map the given Boolean logic
function
c) to minimize the terms in a Boolean
expression
d) to Maximize the terms in a Boolean
expression
90. Which of following requires
refreshing?
a) SRAM
b) DRAM c) ROM d)
EPROM
Part III
- Wheatstone bridge
method of resistance measurement is ideally suitable for the measurement
of resistance values in the range
- 0.001 ohm to
1 ohm B. 0.1 ohm
to 100 ohm c. 100 ohm to 10
k-ohm d. 100 k-ohm to 10 M
ohm
- The value of
resistance of an earthing electrode depends upon
- Shape and
material of electrode b. depth to which electrode is driven into earth c.
specific resistance of soil D. All of the above
- A dc motor can
be easily identified by
- Yoke b. Size of the conductor c. Commutator d.
Winding
- In a dc motor,
the ratio of back emf to supply emf is an indication of its
- Efficiency b. speed regulation c. starting torque d. running torque
- In case of Parallel
operation of compound generators, for proper division of load from no load
to full load, it is essential that
- The regulation of each armature
should be same
- their series field resistances should be
equal
- their ratings should be equal
- none of these
- The frequency
of voltage generated in an alternator depends on
- Number of
poles b. speed of alternator c. both A. and B. d.
type of winding
- A 20 pole
alternator rotates at 600 rpm. The periodic time of current in seconds per
cycle is
- A. 0.02 B. 0.01 C.0.005 D. 0.04
- When an
induction motor runs at rated load and speed, the iron losses are
- Negligible b. very heavy c.
independent of supply frequency d.
independent of supply voltage
- In a
three-phase system, the voltages are separated by
- 45 degree B.
90 degree C. 120
degree D. 180 degree
- The equation
of a current given by i=Im sin 2ωt. the frequency of the
current in Hz is
- ω/2π 2. ω/2 c.
2ω/π d. ω/π
- In a ∆ - connected source feeding a
Y-connected load
- Each phase voltage equals the
difference of the corresponding load voltages
- Each phase
voltage equals the corresponding
load voltage
- Each phase
voltage is one-third the
corresponding load voltage
- Each phase
voltage is 600 out of phase with the corresponding load
voltage
- A single –
phase sinusoidal voltage of 120 V is connected to a 90Ω load. Current in
the circuit is
- 13.3 mA b. 133 mA c. 1.33 A d. 1.33 mA
- The primary
winding of a transformer has 110 V ac across it. What is the secondary
voltage if the turns ratio is 8?
- 8.8 V b. 88V c. 880V d.
8888V
- Slip of
induction motor does not depends on
- Rotor speed b. synchronous speed c. shaft torque d. core loss
- In a
synchronous motor, the inverted curve represent the relation between
- Field current
& Armature current b.
Armature current and Power Factor c. Field current & Power Factor d. none of these
- In a
transformer the coils of primary and secondary are placed concentrically
to achieve
- Reduced leakage flux between primary
and secondary winding
- Reduced
copper losses in the winding
- Reduced
insulation cost of the windings
- Reduced
voltage per turn in the winding
- What is the
necessity of copper brushes in a dc motors?
- To absorb the
mechanical shocks produced during running condition
- To convert
alternating supply current to direct current
- To increase
the flux cutting by the rotor
- None of these
- Bulk oil
circuit breaker is suitable for voltages up to
- 4 kV b. 10 kV c. 25 kV d. 36 kV
- Shunt reactors
are connected with transmission lines for
- Limiting
fault current b. limiting fault
voltage c. absorbing reactive power d. absorbing high voltage surges
- The advantage
of grounding a power system is that
- Earth fault
current can be used to operate relays
- “Arching
ground” phenomenon is avoided
- It provides symmetry to the line impedances
- Both A) and
B)
- The SCR is turned-off when the anode current falls
below
- Forward
current rating b. break
over voltage c. holding current d. latching current
- Chopper
control for DC motor provides vibration in
- Input voltage b. Frequency c. both A and B d. none of these
- As per
sampling theorem
- The signal
should be sampled at least twice each cycle of its lowest frequency
- Twice each cycle of its highest
frequency
- Guard time
should be as large as possible
- Nyquist rate
should as low as possible
- In
communication, the sampling technique leads to
- Higher
efficiency b. higher speed of communication c. cheaper communication d. all of the above
- In frequency
modulation, if the frequency of the modulating voltage is doubled, the
rate of deviation of carrier frequency
- Doubles b. becomes four times c. becomes half d. remains unaltered
- The drawback
of FM relative to AM is that
- Noise is very
high for high modulation frequencies
- Larger bandwidth is required
- Higher
modulating power is required
- Higher output
power is required
- In pulse
modulation system, the modulating signal controls the
- Pulse
amplitude b. pulse width c. pulse spacing d. al of these
- A PLL can be used to demodulate
- PAM signals b. PCM Signals c. FM Signals d. DSB-SC Signals
- Modems are
used for data transmission over telephone lines to
- Increase the transmission capacity b. improve noise performance c.
incorporate error control handling
d. eliminate dc component in the transmitted signal
- In a DM(Delta
Modulation ) system, the granular (idling) noise occurs when the
- Modulation signal
increases rapidly b. pulse
rate decreases c. modulating signal remains constant d. pulse amplitude decreases
- PCM systems
require regenerative repeaters over long distances. The correct sequence
of the operations which such a repeater performs is
- Timing, equalization and decision
making
- Equalization,
timing and decision making
- Timing,
thresholding (decision) and equalization
- Thresholding,
timing and equalization
- The loading of
telephone lines by inductances at uniform intervals is done to
- Reduce attenuation b. eliminate high frequencies
c. reduce near end cross talk d.
reduce far end cross talk
- Telephone
traffic is specified in terms of
- Average
waiting time b. peak
waiting time c. grade of service d. Erlongs
- Which of the
following requires a synchronizing signal?
- Single channel PPM system b. PAM c. PDM d. all of these
- In a PCM
system, the number of quantization levels are 16 and the maximum signal
frequency is 4 KHz, the bit transmission rate is
- 64 K bits/sec b.
16 K bits/sec c. 32 K bits/sec d.
32 bits/sec
- PAM signals
can be demodulated by using a
- Low pass
filter(LPF) alone b. a Schmitt
trigger followed by a LPF c. a
differentiator followed by a LPF d. a clipper circuit followed by a
LPF
- Microwave
frequency range extends from
- 3 MHz to 30
MHz b. 30 MHz c.
300 MHz to 300 GHz d. 300 MHz
to 3000MHz
- Which of the
following noise becomes important at microwave frequencies?
- Short noise
b. Flicker noise c. thermal noise d. transmit time noise
- The advantage
of microwave lower frequency signals are
- Increased
bandwidth b. ability to
use high gain, directive antenna
c. greater secrecy d. all of these
- When the free
space wave length of a signal equals the cut-off wavelength of guide
- Group
velocity of the signal becomes zero
- Phase
velocity of the signal becomes infinite
- Wavelength
within the waveguide becomes infinite
- All of above
- When microwave
signals follow the curvature of the earth, this is called
- Ducting b. Farady effect c. tropospheric scatter d. ionospheric reflection
- The wavelength
of microwaves at 100 GHz will be
- 3 cm b.
3 mm c. 0.03 cm d. 0.3 m
- Klystron
oscillator may be used as
- Signal source
in microwave generator b.
local oscillator in microwave receiver c.
pump oscillator in parametric amplifier
d. all of these
- TWT is
basically a/an
- Oscillator b. Tuned Amplifier c.
wideband amplifier d.
audio amplifier
- What is the
main difference between synchronous and asynchronous transmission
- The bandwidth
required is different
- The pulse
height is different
- The clocking is derived from the data
in synchronous transmission
- The clocking
is mixed with data in asynchronous transmission
- Satellite
transponders
- Use a higher frequency for reception
of radiation from earth stations and lower frequency for transmission to
earth stations
- Use lower
frequency for reception of radiation from earth stations and higher
frequency for transmission to earth stations
- Use a single
frequency for reception and transmission from one point on earth to
another
- Are devices
that echos the radiation without change from oen point on earth to
another
- What function
does a serial interface perform in data communication?
- Converts
serial data into audio data signals
- Converts
analog signal into digital signal
- Converts parallel data into a stream
bites and vice-versa
- All of these
- The data rate
of the ISDN Basic Rate Access D Channel is
- 64 Kbps b. 16 Kbps c. 8 Kbps d. 144 Kbps
- In a prototype
low pass filter, the series and shunt elements are respectively
- Capacitive
and inductive b. inductive and capacitive c. capacitive and resistive d. resistive and inductive
- Mho relay is
normally used for the protection of
- Long transmission lines b. medium length lines c. short length lines d. no length criterion
- The leakage
resistance of a 50 km long cable is 1 MΩ. For a 100Km long cable it will
be
- 1M Ω b. 2 M Ω c. 0.66M Ω d. none of these
- The effect of
bonding the cable is to
- Increase the
effective resistance and inductance
- Increase the effective resistance but
reduce inductance
- Decrease the
effective resistance and inductance
- Decrease the
effective resistance but increase the inductance
- The main
advantage of ac transmission over dc transmission system is
- Less
insulation problems
- Low losses in transmission power over
long distances
- Less
instability problems
- More economic
as end use appliances are mostly AC powered
- Constant
voltage transmission has the advantage(s) of
- Availability
of steady voltage at all loads at the receiving end
- Possibility
of better protection for the line due to possible use of higher terminal
reactance
- Possibility
of carrying increased power for a given conductor size in case of long
distance heavy power transmission
- All of these
- For a
distortion less transmission line where G is the shunt conductance between
two conductors.
- RL=GC b. RC=GL c. RG=LC d. RLGC=0
- Which of the
following statement is not correct?
- It is not possible to have precise
measurement which are not accurate
- Correctness
in measurement requires both accuracy and precision
- Reproducibility
and consistency are expressions that best describe precision in
measurements
- An instrument
with 2% accuracy is better than another with 5% accuracy
- A wattmeter
has a full scale range of 2500 W. It has an error ±1% of true value. If
true power is 1250 W , range of reading will be
- 1225 W – 1275
W b. 1245 W – 1255
W c. 1200 W – 1300 W d.
1237.5 W – 1262.5 W
- If two 300 V
full-scale voltmeters V1 & V2 having sensitivities of 100 k Ω / v and
150 k Ω/v are connected in series to measure 500 V then
- V1 and V2
will read 250 V each b. V1 will read 200V and V2 will read
300 V c. V1 will read 300 V
and V2 will read 200 V d.
V1 and V2 will read 0
- Hysteresis in
an instrument means
- Repeatability
of the instrument
- Reliability
of the instrument
- Change in same reading when input is
first increased and then decreased
- Inaccuracy
due to change in temperature
- A digital volt
meter measures
- Peak value b. peak-to-peak value c. rms value d. average value
- In a digital
voltmeter, the Oscillator frequency is 400 kHz and ramp voltage falls from
8 V to 0 V in 20msec. The number of pulses counted by the counter is
- 800 b. 2000 c. 4000 d.
8000
- Digital
instruments have input impedance of the order of
- 1 Ω B. k Ω C. M Ω D. m Ω
- Q-factor of
Q-Meter is
- ω0
R/L b. LR/ ω0 c. ω0L/R d.
none of these
- Range of an
analog transducer is 0-10 V. For a resolution of 5 mV, the bits of ADC will be
- 8 b. 9 c. 10 d. 11
-
- Backlash is
- Unwanted
signal tending to obscure the transducer signal
- Maximum angle or distance through
which any part of mechanical system may be moved in one direction without
causing motion of the next part
- Departure of
instrument output from its calibrated value
- All of these
- In a closed
loop control system
- Control
action depends on the output and also on the input command
- Output signal
is feedback to be compared with reference signal
- Accuracy is
better than in open loop system
- All of these
- A servo system must have
- Feedback
system b. power amplifier to amplify error c. capacity to control position or its
derivative d. All of these
- The main
drawback of a feedback system is
- Inaccuracy b. inefficiency c. insensitivity d. instability
- In a second
order system, if the damping factor ε is less than unity , the system will
be
- Under damped b. over damped c. critically damped d. freely oscillating
- The most
suitable method for determining the stability and transient response of a
system is
- Bode plot b. Root locus c.
Nyquist criterion d. Routh
Hurwitz criterion
- For Type three
system , the lowest frequency asymptote will have the slope of
- -20dB/octave b. -6 dB/octave c. -12 dB/octave d. -18 dB/octave
- Excessive
noise in a control system may result in
- Reduction in
gain b. reduction in bandwidth c. oscillations d. saturation in amplifying stages
- A system with
gain margin close to unity or a phase margin close to zero is
- Highly stable b. Highly oscillatory c. relatively stable d. none of these
- How many
address lines are needed to address each memory location in a 2048 X 4
memory chip?
- 10 b. 11 c. 12 d. 18
- The bus which
is used to transfer data from main memory to peripheral device is the
- Data bus b. Input bus c. DMA bus d. Output bus
- RISC is
characterized by
- Hardware
Control design with no micro codes
- Fixed
instruction format
- Several
general purpose registers and large cache memories which support very
fast access of data d. All of the above
- The
microprocessor contains ROM chip which contains
- Control
Function b. Arithmetic
Functions c. Instructions to execute data d. Memory Functions
- An assembler
for a microprocessor is used for
- Assembly of
processors in a production line
- Creation of
new programs using different modules
- Translation of a program from
assembly language to machine language
- Translation
of a higher level language into English text.
- A Language
developed to assist children in learning geometric shapes and computing is
- COBOL b. BASIC c. LOGO d.
LISP
- The process of
accessing data stored in a tape is similar to manipulating data on
- Stack b.
Queue c. List d. heap
- Which of the
following chips can be reprogrammed with special electric pulses?
- EPROM b. PROM c. ROM d.
EEPROM
- A computer
program that translates one program instruction at a time into machine
language is called
- Interpreter b. CPU c.
compiler d. Simulator
- Which of the
following memories has the shortest access time?
- Cache Memory b. Magnetic Bubble Memory c. Magnetic Core Memory d. RAM
- Linkage
between the CPU and users is provided by
- Peripheral Devices b. Storage c. Control Unit d. Software
- Which of
following typically uses a keyboard for input
- Desktop
Terminal b. Point of Sale
terminal c. Financial
Transaction terminal D. All of these
- How many OSI layers are covered in the X.25 standard?
- Three b.
Four c. Two d. Seven
- Layer Four of
the OSI model is
- Physical
layer b. Link layer c. Transport
Layer d. Network Layer
- The TCP/IP protocol which is used for remote
terminal connection service is
- TELNET b. FTP c. RARP d. UDP
- Which of the
Following protocol is used for transferring files from one machine to another?
- RARP b. ARP c.
TCP D. FTP
- A transparent
DBMS
- Cannot hide
sensitive information from users
- Keeps its
logical structure hidden from users
- Keeps its physical structure hidden
from users
- Both B) and
C) above
Thanks n Regards
Rajesh
TTA Bangalore
