Tachometer MCQ | Tachogenerator MCQ

1. For a tachometer, if θ(t) is the rotor displacement, e(t) is the output voltage and K is the tachometer constant, then the transfer function is defined as

  1. Ks2
  2. K/s
  3. Ks
  4. K

Answer
Answer. c

2. A tachometer is added to a servo-mechanism because

  1. it is easily adjustable.
  2. it can adjust damping
  3. it converts velocity of the shaft to a proportional d.c. voltage.
  4. it reduces steady-state error.

Answer
Answer. c

3. For a tachometer if θ(t) is the rotor displacement, e(t) is the output voltage and Kt is the tachometer constant, then the transfer function is defined as

  1. Kts2
  2. Kts
  3. Kt/s
  4. Kt

Answer
Answer. b

4. The effect of tachometer feedback in a control system is to reduce

  1. only time constant
  2. only gain
  3. damping ratio
  4. both gain and time constant

Answer
Answer. b

5. In a speed control system, output rate feedback is used to

  1. Limit the speed of motor
  2. Limit the acceleration of the motor
  3. Reduce the damping of the system
  4. Increase the gain margin

Answer
Answer. d

6. In position control systems, the device used for providing rate feedback is called

  1. servomotor
  2. tachogenerator
  3. synchro
  4. potentiometer

Answer
Answer. b

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