Control Systems

11. A phase lag lead network introduces in the output

1. lag at all frequencies
2. lag at high frequencies and lead at low frequencies
3. lag at low frequencies and lead at high frequencies
4. none of the above

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12. A signal other than the reference input that tends to affect the value of controlled variable is known as

1. disturbance
2. command
3. control element
4. reference input

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13. A.C. servomotor is basically a

1. universal motor
2. single phase induction motor
3. two phase induction motor
4. three phase induction motor

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14. A.C. servomotor resembles

1. two phase induction motor
2. Three phase induction motor
3. direct current series motor
4. universal motor

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15. Addition of zeros in transfer function causes which of the following?

1. Lead-compensation
2. Lag-compensation
3. Lead-lag compensation
4. None of the above

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16. An amplidyne can give which of the following characteristics?

1. Constant current
2. Constant voltage
3. Constant current as well as constant voltage
4. Constant current, constant voltage and constant power

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17. An automatic toaster is a loop control system.

1. open
2. closed
3. partially closed
4. any of the above

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18. An increase in gain, in most systems, leads to

1. smaller damping ratio
2. larger damping ratio
3. constant damping ratio
4. none of the above

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19. Any externally introduced signal affecting the controlled output is called a

1. feedback
2. stimulus
3. signal
4. gain control

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20. As a result of introduction of negative feedback which of the following will not decrease?

1. Band width
2. Overall gain
3. Distortion
4. Instability

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