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ASSISTANT-PROFESSOR-IN-ELECTRICAL-AND-ELECTRONICS-ENGINEERING---TECHNICAL-EDUCATION---ENGINEERING-COLLEGES Related Question Answers
76. The receiving end voltage can be higher than sending end voltage due to :
Hall effect Proximity effect Corona effect Ferranti effect
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77. The coefficient of reflection for current for an open ended line is :
Zero 1.0 -1.0 Infinity
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78. The positive sequence component of voltage at the point of fault is zero when it is a :
3 phase fault L-L fault L-G fault LLG fault
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79. The principle of operation of LVDT is based on variation of:
Resistance Reluctance Self inductance Mutual inductance
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80. In the measurement of power by two wattmeter method in three phase circuit, when one of the wattmeter shows zero reading, it can be inferred that:
Power factor of the circuit is zero Power factor of the circuit is 0.5 lagging Pow er factor of the circuit is unity Zero reading wattmeter is faulty
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81. The condition for stability of second order system is that the two system poles should be :
located at the origin in the 8-plane located in the imaginary axis of s-plane located in the right half of s-plane located in the left half of s-plane
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82. Select the incorrect relation :
TP =-----Z----- £ ■ GAf/100774 Maximum overshoot = lOOe*1^' % Ta=
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83. A unit step applied tothe closed-loop systemA unit step applied to the closed-loop system,
Critically damped response Under damped response Over damped response-5--------with K =1, will show :+ 2a +K Undamped response
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84. The characteristics equation of the system is obtained as, A(s) = s(s + 3X + 10)+K The range of K for stability is:
K>0 0 0 K >390
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85. For a system to be stable :
Both GM and PM should be zero Both GM and PM should be negative Both GM and PM should be positive GM should be infinite and PM should be zero
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86. The system represented by j » £ ^ 5j + u; y = [0l]^ j is :
Controllable and Observable Controllable but Unobservable Uncontrollable and Unobservable Uncontrollable but Observable
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87. A Non-linear system is characterized by :
Multiple equilibrium points Non generation of limit cycle Independed of input signal Independed of initial conditions
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88. Choose the incorrect statement with sampling process :
Sampling frequency should be at least 2 times the highest frequency in the signal Sampling introduces approximately a delay of Ts/2 Pre-filters are used before sampling of the signal to be processed Increase in the sampling frequency increases the stability margin
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89. PID controller introduces :
One pole and one zero One pole and two zeros Two poles and one zero No poles and zeros
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90. The effect of addition of a ‘zero’ to the system is :
To push the root-locus towards the right side of 8-plane To reduce the gain of the system To introduce a delay in the system response To reduce the stable range of operation of the system
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91. Positive feedback is used in :
Furnace temperature control Liquid flow control Speed control of motor Phase shift oscillatorPhase shift oscillator
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92. Tunnel diode :
is a reverse recovery diode is a power diodeis a power diode has light dopinghas light doping has heavy dopinghas heavy doping
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93. The a and β of a transistor are related to each otheras:
(B)=a/1+a B=1+a/1-a a=b/1+B a=1+B/1-B
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94. Two amplifiers each of bandwidth 10 kHz are cascaded. The overall bandwidth 'becomes :
5 kHz 6.4 kHz 10 kHz 20 kHz
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95. An op-amp has a common mode gain of 0.01 and a differential mode gain of 105. Its CMRR would be:
10 -7 108 103 107
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96. The 'Snubber’ circuit is used in thyristor circuits for:
Triggering dv/dt protection di/dt protection Bypass high frequency noise
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98. What is the simplified form of the Boolean expression? T = (X -t- Y)(x + Y X^ + K):
XY -XY XY XY-
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99. Which of the following is used as latch?
J-K Master-Slave R-S flip- flop D flip-flop T flip - flop
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