PART 05 - ELECTRICAL, ELECTRONICS, COMMUNICATION INSTRUMENTATION
ENGINEERING
(Answer ALL questions)
76. How much energy is stored by a 100 81. A shunt generator running at
inductance with a current of 1 A? has generated as 200 V. If the speed
1. 100 J increases to 1200 rpm, the generated emf
will be nearly
2. 1J
77. If a network contains B branches and
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N nodes then the number of mesh current 4. 290V
equations would be
82. In a generator in case the resistance of
the field winding is increased then output
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2. voltage will
B- N- 1 1. increase
OB 2. decrease
78. 3. remain unaffected
the current 4. fluctuate
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1. leads the applied voltage
83. D.C. motors are widely used in
2. lags behind the applied voltage
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1. sets
3. is in phase with the voltage
2. Air compressors
4. is in quadrature with the voltage
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3. Electric traction
79. In a certain series RC circuit, the true power
4. Machine shops
is 2 W and the reactive power is 3.5 VAR.
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What is the apparent power?
84. The starting winding of a single-phase motor
1. 3.5 VA is placed in
2VA
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2. 1. armature
3. 4.03 VA 2. field
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4. 3VA 3. rotor
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80. A sine wave voltage is applied across an 4. stator
inductor when the frequency of voltage is
increased, the current 85. An over-excited synchronous motor takes
1. increases 1. leading current
2. decreases 2. lagging current
3. remains the same 3. both (1)and (2)
4. is zero 4. in phase current
In open loop the control action 91. A Norton's equivalent is
1. depends on the size of the system 1. parallel circuit
2. depends on system variables
2. series circuit
3. depends on the input signal
3. series-parallel circuit
4. is independent of the output
4. none of the above
87. A controller is essentially a
1. Sensor 92. A resistor of 5 ohms is connected in one
2. Clipper branch of a complex network. The current in
this branch is 5 A. If this 5 resistor is
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3. Comparator
replaced by 10 resistor the current in this
4. Amplifier
branch will be
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88. A signal flow graph is a
1.
1. topological representation of a set of
differential equations 2. A
2. polar graph
OB 3. 5A
3. log log graph
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4. less than 5 A
4. special type of graph to analyse
modern control systems
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93. To determine the polarity of the voltage drop
89. the gain margin is positive and the across a resistor, it is necessary to know the
phase margin is negative, the system is
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value of the resistor
1. stable
2. value of current through the resistor
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2. unstable
3. stable or unstable depending on the 3. direction of current through the
system resistor
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4. undeterministic 4. power consumed by the resistor
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90. The effect of adding poles and zeros can be
94. In a network the number of tree branches
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determined quickly by which of the
following? 1. is equal to the number of links
1. Root locus 2. cannot be equal to number of links
2. Nyquist plot
3. is twice the number of links
3. Bode plot
4. has no relation with the number of link
4. Nicholar chart
branches
95. For a voltage source 99. Inverter gain is given by the ratio
1. the source emf and terminal voltage 1. dc output input voltage
are equal 2. ac output input voltage
2. terminal voltage is always lower than 3. dc output input voltage
source emf 4. ac output voltageldc input voltage
3. terminal voltage cannot be higher than 100. A diode works on the principle of
source emf
1. tunnelling of charge carriers across the
4. terminal voltage is zero junction
2. thermionic emission
96. Kirchoff s voltage law states that the
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3. diffusion of charge carriers across the
1. total voltage drop in a series circuit is junction
always finite 4. hoping of charge carriers across the
Z.C
2. sum of emf and voltage drops in a junction
closed mesh is zero
101. The major application of chopper drive is in
3. sum of emfs in a series circuit is zero OB 1. traction
4. sum of emf and voltage drops in a 2. computers
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closed mesh is not zero 3. heating furnishes
4. miniature motors
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97. In a thyristor, the magnitude of anode
current will When a thyristor gets turned on, the gate
drive
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1. increase if gate current is increased
1. should not be removed or it will turn
2. decrease if gate current is decreased
off the SCR
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3. increase if gate current is decreased may or may not be removed
4. not change with variation in gate 3. should be removed
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current 4. should be removed in order to avoid
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increased losses and higher function
98. For an SCR, dildt protection is achieved temperature
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through the use of
103. Computer cannot do anything without a
1. R in series with SCR
1. chip
2. L in series with SCR 2. memory
3. RL in series with SCR 3. output device
4. RLC in series with SCR 4. program
104. The first computer made available for 109. The most suitable thermocouple to be used
use was for measuring temperature in the range of
1. Mark-I C to 1500" C is
2. ENIAC
3. 2. Iron-Constantan
4. UNIVAC
3.
105. When did Intel announce its 16-bit 80286 Platinum-Rhodium
chip?
1. 1980 110. LVDT is a
2. 1982 1. displacement transducer
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3. 1984 2. velocity transducer
4. 1986 3. acceleration transducer
Z.C
106. How many bits can be stored in the 8 K pressure transducer
RAM?
111. In a strain measuring equipment using a
1. 8000
2. 8192
OB resistance strain gauge the output quantity
is
3. 4000 1. resistance
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4. 4096 2. voltage
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107. The larger the RAM of a computer, the faster 3. current
its processing speed is since i t eliminates the
4. impedance
1. need of ROM
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2. need for external memory 112. If the temperature increases by C, the
3. frequent disk resistivity of a thermistor is likely to become
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need for wider data path 1. one half of initial value
108. Which of the following types of transducers 2. one fiftieth of initial value
can be used for measuring the angular
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3. twice the initial value
position?
4. no change
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(a) Circular potentiometer
LVDT 113. The purpose of duplexer is
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E-Pick off
1. to convert TDM to FDM
Synchro
2. to provide same antenna both for
Select the correct answer using the codes
transmission and reception
given below :
1. and 3. to convert pulsed transmission to
transmission
2. (a) and
4. both (1)and
3. and
4. and
114. In FM transmission, amplitude of the 118. Generally the aircraft electrical system
modulating signal determines
supply frequency of
1. rate of frequency variations
1.
amount of frequency shift
3. total balance of transmission 2. 60 Hz
4. distance of broadcast
3. 400 Hz
115. The highest harmonic generated in human
voice is 4. 115 Hz
1 kHz
119. In GPS Navigation, there can be integration
2.
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between
3. 3kHz
1. GPS and INS
4.
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2. GPS and LORAN C
116. If the reflection coefficient of a line is zero,
the line is
3. GPS and ILS
1. Infinite line OB 4. GPS and DME
2. Open-circuited
3.
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Short-circuited
120. Mach Number is defined as the ratio between
4. Very short line
True air speed and speed of the sound a t
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117. The receiving antenna most used
1. sea level
for TV broadcasting in the UHF band is
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1. turnstile antenna 2. any altitude
dipole antenna
3. a particular altitude
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3. antenna
4. all altitudes
4. antenna
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