control systems Mcqs
1. A car is raining at a constant speed of 50 km/h, which of the following is the feedback element for the driver ?
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A. Eyes

B. Clutch

C. None of the above

D. Steering wheel

E. Needle of the speedometer
2. The capacitance, in force-current analogy, is analogous to_____________?
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A. displacement

B. momentum

C. velocity

D. mass
3. Spring constant in force-voltage analogy is analogous to_____________?
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A. current

B. reciprocal of capacitance

C. resistance

D. capacitance

4. increases the steady state accuracy?
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A. Integrator

B. Phase lead compensator

C. Phase lag compensator

D. Differentiator

5. ______________By which of the following the system response can be tested better ?
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A. Sinusoidal input signal

B. Unit impulse input signal

C. Exponentially decaying signal

D. Ramp input signal

6. Which of the following is an electromagnetically device ?
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A. LVDT

B. Induction relay

C. Thermocouple

D. None of the above

E. Any of the above

7. A controller, essentially, is a________________?
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A. clipper

B. amplifier

C. comparator

D. sensor

8. Which of the following should be done to make an unstable system stable ?
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A. The gain of the system should be decreased

B. The number of zeros to the loop transfer function should be increased

C. The number of poles to the loop transfer function should be increased

D. The gain of the system should be increased
9. Which of the following can be measured by LVDT ?
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A. Displacement

B. Acceleration

C. Any of the above

D. Velocity

10. An automatic toaster is a ___________ loop control system?
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A. open

B. closed

C. partially closed

D. any of the above

11. If the gain of the critical damped system is increased it will behave as______________?
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A. underdamped

B. oscillatory

C. critically damped

D. none of the above

E. overdamped

12. Which of the following is an open loop control system ?
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A. Field controlled D.C. motor

B. Ward leonard control

C. Stroboscope

D. Metadyne

13. The first order control system, which is well designed, has a_______________?
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A. small bandwidth

B. none of the above

C. negative time constant

D. large negative transfer function pole
14. Due to which of the following reasons excessive bond width in control systems should be avoided ?
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A. Noise is proportional to band width

B. None of the above

C. It leads to low relative stability

D. It leads to slow speed of response

15. A good control system has all the following features except_____________?
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A. sufficient power handling capacity

B. good stability

C. slow response

D. good accuracy

16. In open loop system_____________?
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A. the control action is independent of the output

B. the control action depends on system variables

C. the control action depends on the size of the system

D. the control action depends on the input signal

17. With feedback __________ increases?
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A. gain

B. effects of disturbing signals

C. sensitivity

D. system stability
18. ___________From which of the following transfer function can be obtained ?
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A. Output-input ratio

B. Signal flow graph

C. Standard block system

D. Analogous table

E. None of the above

19. The viscous friction co-efficient, in force-voltage analogy, is analogous to______________?
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A. charge

B. reciprocal of inductance

C. resistance

D. none of the above

E. reciprocal of conductance

20. has tendency to oscillate______________?
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A. Open loop system

B. Closed loop system

C. Both A. and B.

D. Neither A. nor B.

21. The transient response, with feedback system_____________?
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A. rises quickly

B. decays slowly

C. rises slowly

D. decays quickly
22. A closed loop system is distinguished from open loop system by which of the following ?
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A. Input pattern

B. Servomechanism

C. Feedback

D. Output pattern

23. Which of the following is the output of a thermocouple ?
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A. Direct current

B. Alternating current

C. A.C. voltage

D. None of the above

E. D.C. voltage
24. When the initial conditions of a system are specified to be zero it implies that the system is________________?
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A. working normally with zero reference input

B. at rest without any energy stored in it

C. working normally with reference input

D. at rest but stores energy
25. Which of the following statements is correct for any closed loop system ?
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A. Only one of the static error co-efficients has a finite non-zero value

B. All the co-efficients can have zero value

C. All the co-efficients are always non-zero

D. None of the above

26. The transfer function technique is considered as inadequate under which of the following conditions ?
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A. Systems having multiple input disturbances

B. Systems having stability problems

C. Systems having complexities and non-linearities

D. All of the above
27. A.C. servomotor resembles_____________?
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A. universal motor

B. two phase induction motor

C. Three phase induction motor

D. direct current series motor

28. The temperature, under thermal and electrical system analogy, is considered analogous to_______________?
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A. charge

B. voltage

C. none of the above

D. capacitance

E. current

29. Which of the following is the best method for determining the stability and transient response ?
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A. None of the above

B. Nyquist plot

C. Bode plot

D. Root locus
30. Which of the following is the non-linearity caused by servomotor ?
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A. Saturation

B. Backlash

C. None of the above

D. Static friction

31. Static error coefficients are used as a measure of the effectiveness of closed loop systems for specified ___________ input signal?
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A. position

B. acceleration

C. velocity

D. all of the above
32. Velocity error constant of a system is measured when the input to the system is unit ___________ function?
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A. parabolic

B. step

C. impulse

D. ramp
33. Phase margin of a system is used to specify which of the following ?
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A. Absolute stability

B. Time response

C. Frequency response

D. Relative stability
34. The initial response when tne output is not equal to input is called_____________?
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A. Either of the above

B. Transient response

C. Error response

D. Dynamic response

35. In force-voltage analogy, velocity is analogous to______________?
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A. capacitance

B. current

C. charge

D. inductance

36. Which of the following devices is used for conversion of co-ordinates ?
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A. Synchro-resolver

B. Selsyn

C. Microsyn

D. Synchro-transformer

37. In a system zero initial condition means that______________?
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A. The system is working with zero stored energy

B. The system is working with zero reference signal

C. The system is at rest and no energy is stored in any of its components
38. The second derivative input signals modify which of the following ?
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A. None of the above

B. The time constant of the system

C. The gain of the system

D. Damping of the system

E. The time constant and suppress the oscillations
39. Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?
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A. The system is relatively stable

B. The system is highly stable

C. None of the above

D. The system is highly oscillatory
40. Pressure error can be measured by which of the following ?
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A. Differential bellows and straingauge

B. Strain gauge and potentiometer

C. Strain gauge

D. Selsyn

41. ________________directly converts temperature into voltage?
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A. Thermocouple

B. Gear train

C. None of the above

D. Potentiometer

E. LVDT

42. In a system low friction co-efficient facilitates___________?
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A. increased speed of response

B. increased velocity lag error

C. reduced time constant of the system

D. reduced velocity lag error
43. The transient response of a system is mainly due to________________?
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A. stored energy

B. friction

C. inertia forces

D. internal forces

44. A signal other than the reference input that tends to affect the value of controlled variable is known as_________________?
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A. reference input

B. control element

C. command

D. disturbance
45. A conditionally stable system exhibits poor stability at______________?
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A. none of the above

B. reduced values of open loop gain

C. increased values of open loop gain

D. low frequencies

46. The type 2 system has __________ at the origin?
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A. simple pole

B. two poles

C. no net pole

D. net pole

47. ____________is a part of the human temperature control system?
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A. Leg movement

B. Digestive system

C. Perspiration system

D. Ear

48. The effect of error damping is to______________?
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A. none of the above

B. provide larger settling lime

C. reduce steady state error

D. delay the response

E. any of the above

49. The type 0 system has ___________ at the origin?
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A. two poles

B. none of the above

C. no pole

D. net pole

E. simple pole

50. Mass, in force-voltage analogy, is analogous to________________?
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A. current

B. resistance

C. inductance

D. charge