Multiple Choice Questions and Answers on Integral Square Error

1. The response of a servomechanism is 1+0.2e-60t-1.2e-10t when subjected to a unit step input. What is the damping ratio?

a) 1.21

b) 1.43

c) 1.59

d) 1.74

Answer: 1.43

2. For a unity feedback control system, the open loop transfer function G(s) = 10(s+2)/s2(s+1). What is the acceleration error constant?

a) Infinity

b) 5

c) 10

d) 20

Answer: 20

3. The open loop transfer function for a unit feedback system is G(s) = K/s(sT+1). By what factor the amplitude gain K should be reduced so that the peak overshoot becomes 25% from 75%?

a) 75

b) 25

c) 20

d) 10

Answer: 20

4. How many types of controllers and compensators are there respectively?

a) 4, 3

b) 3, 4

c) 4, 5

d) 5, 4

Answer: 4, 3

5. A unity feedback system has an open loop transfer function G(s) =25/s(s+8). What is the percentage of it’s peak overshoot?

a) 0.13%

b) 1.13%

c) 1.26%

d) 1.52%

Answer: 1.52%

6. What is the response of the feedback function with open loop transfer function G(s) = 4/s(s+5) and input is input step?

a) 1-1/3(4e-t – e-4t)

b) 1-1/2(6e-t – e-4t)

c) 1-1/3(6e-t – e-4t)

d) 1-1/2(4e-t – e4t)

Answer: 1-1/3(4e-t – e-4t)

7. What is the analogous electrical element of Frictional coefficient (B) in Force-Current Analogy for mechanical translational system?

a) Resistance

b) Conductance

c) Flux

d) Voltage

Answer: Conductance

8. What is the need for a controller?

a) Receive control signals

b) Transmit control signals

c) Modify control signals

d) Create control signals

Answer: Modify control signals

9. Actuator is the basic component of an automatic control system.

a) False

b) True

Answer: True

10. A performance index must offer selectivity.

a) True

b) False

Answer: True