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Electrical Engineering Objective Questions { Control System }



183.  Nonlinearity in the servo?system due to saturation is caused by
A. servo motor
B. relays
C. gear trains
D. all of these
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184.  The servo-mechanism is called a proportional error device when the output of the system is
A. a function of the error only
B. a function of the first derivative of the error
C. a function of the error and its first derivative
D. a function of the second derivative of the error
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185.  The limits of GM and PM resulting in a reasonably good degree of relative stability respectively are
A. 12 dB, 1800
B. 6 dB, ?1800
C. 6d11, 39? to 35?
D. 12 dB, 30? to 35?
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186.  The ?180? phase line of Bode diagram is equal to
A. positive imaginary axis in Nyquist plot
B. negative imaginary axis in Nyquist plot
C. positive real axis in Nyquist plot
D. negative real axis in Nyquist plot
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187.  The servomotor works on the same basic principle as that of a
A. two phase induction motor
B. single phase induction motor
C. three phase induction motor
D. none of these
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188.  Which of the following can not be treated as an amplifier in control system?
A. DC generator
B. Amplidyne
C. DC motor
D. Metadyne
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189.  The selsyn servosystem provides a
A. mechanical gearing between two shafts
B. electrical gearing between two shafts
C. overvoltage protection both A and B above
D. none of these
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