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Control System MCQ

Control System MCQ

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  • 01st May, 2021
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Control Systems MCQ Test

Following are mostly asked Control system MCQ test that are designed for professionals like you to crack you interviews. You can take this Control system online test before appearing to you real interview. This Control system quiz there are around 30+ multiple choice questions on Control system with four options.

1) In the cauer-2 form of LC network---------is series element and --------is shunt element respectively?

  • A.  L and C
  • B.  C and L
  • C.  L and L
  • D.  C and C

2) Lowest critical frequency is due to pole and it may be present at the origin or nearer to the origin, then the type of network is

  • A.  LC.
  • B.  RL.
  • C.  RC.
  • D.  Any of the above.

3) Lowest critical frequency is due to zero and it may be present at the origin or nearer to the origin, then the type of network is

  • A.  LC circuit.
  • B.  RC circuit.
  • C.  RLC circuit.
  • D.  RL Circuit.

4) Poles and zeros are arranged alternatively on negative real axis, then type of network is/are

  • A.  LC network.
  • B.  RC network.
  • C.  RL network.
  • D.  Both 2 and 3.

5) A box which tells the effect of inputs on control sub system is known as

  • A.  Data Box.
  • B.  Logical box.
  • C.  Decision box.
  • D.  State box.
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6) Which system is also known as automatic control system?

  • A.  Open loop control system
  • B.  Closed loop control system
  • C.  Either 1 or 2
  • D.  Nether 1 nor 2

7) Advantages of open loop control system is/are

  • A.  simple and economical.
  • B.  accurate.
  • C.  reliable.
  • D.  all of the above.

8) Which of the following are the disadvantages of a closed loop control system?

  • A.  Reduces the overall gain.
  • B.  Complex and costly.
  • C.  Oscillatory response.
  • D.  All of the above.

9) The output of the system has an effect upon the input quantity, then the system is a

  • A.  open loop control system.
  • B.  closed loop control system.
  • C.  either 1 or 2.
  • D.  none of the above.

10) By using which of the following elements, mechanical translational systems are obtained?

  • A.  mass element
  • B.  spring element
  • C.  dash-pot
  • D.  all of the above

11) Force balancing equation of a mass element is (where, x = displacement)

  • A.  M d2x/dt2
  • B.  M dx/dt
  • C.  M *x
  • D.  any of the above

12) Which of the following is/are the advantages of a closed loop control system?

  • A.  The closed loop systems are accurate.
  • B.  The closed loop systems are less affected by noise.
  • C.  both 1 and 2.
  • D.  nether 1 nor 2.

13) Force balancing equation of a dash-pot element is (where, x = displacement)

  • A.  B d2x/dt2
  • B.  B dx/dt
  • C.  B *x
  • D.  none of the above

14) Force balancing equation for elastic element (K) is (where, x = displacement)

  • A.  K d2x/dt2
  • B.  K dx/dt
  • C.  K *x
  • D.  none of the above

15) Which of the following is/are the disadvantages of an open loop control system?

  • A.  Inaccurate.
  • B.  Unreliable.
  • C.  both 1 and 2.
  • D.  none of the above.

16) Which of the following is the analogous quantity for mass element in force-voltage analogy?

  • A.  Resistance.
  • B.  Inductance.
  • C.  Capacitance.
  • D.  All of the above.

17) Electrical analogous quantity for spring element (K) in force-voltage analogy is

  • A.  L
  • B.  R
  • C.  1/C
  • D.  C

18) In force-current analogy, electrical analogous quantity for displacement (x) is

  • A.  voltage.
  • B.  inductance.
  • C.  capacitance.
  • D.  flux.

19) Electrical analogous quantity for dash-pot in force-current analogy is

  • A.  resistance.
  • B.  conductance.
  • C.  inductance.
  • D.  capacitance.

20) If a circuit consists of two mass elements, two spring elements and four friction elements. Find the order of transfer function?

  • A.  2
  • B.  4
  • C.  6
  • D.  12

21) If two blocks having gains A and B respectively are in series connection, find the resultant gain using block diagram reduction technique?

  • A.  A+B
  • B.  A*B
  • C.  A-B
  • D.  A/B

22) In signal flow graph input node is node having only------------

  • A.  incoming branches.
  • B.  outgoing branches.
  • C.  both 1 and 2.
  • D.  none of the above.

23) When writing a transfer function which of the following loops are not valid loops?

  • A.  Self loops at input node.
  • B.  Self loops at output node.
  • C.  Both 1 and 2.
  • D.  Neither 1 nor 2.

24) Which of the following is the electrical analogous element for displacement in force-voltage analogy?

  • A.  Flux.
  • B.  Voltage.
  • C.  Charge.
  • D.  Current.

25) If two blocks having gains A and B respectively are in parallel connection, find the resultant gain using block diagram reduction technique?

  • A.  A+B
  • B.  A*B
  • C.  A/B
  • D.  2(A+B)

26) Which of the following is/are the characteristics of negative feedback control system?

  • A.  Low sensitivity to parameter variations
  • B.  Reduction in gain at the expense of better stability
  • C.  Rejection of disturbance signals
  • D.  all of the above

27) Accurate and reliable output is possible with which of the following system?

  • A.  Open loop control system
  • B.  Closed loop control system
  • C.  Both 1 and 2
  • D.  None of the above

28) Which of the following combinations is/are correct electrical analogous elements in force-current analogy?

  • A.  Velocity (v) ----------------- Voltage (V)
  • B.  Force (f) --------------------- Current (i)
  • C.  Spring element (K) --------- Inverse inductance (1/L)
  • D.  all of the above

29) Which of the following is/are the example of actuator?

  • A.  Pneumatic motor
  • B.  Hydraulic motor
  • C.  All
  • D.  Electric motor

30) In signal flow graph output node is node having only------------

  • A.  incoming branches
  • B.  outgoing branches
  • C.  both 1 and 2
  • D.  none of the above

31) Adding a pole to a system transfer function in terms of compensator represents a --------------- compensator ?

  • A.  lead
  • B.  lag
  • C.  lead-lag
  • D.  lag-lead

32) A linear time invariant system, initially at rest when subjected to a unit step input gave response c(t) = te-t (t ≥ 0). The transfer function of the system is

  • A.  1/s(s+1)2
  • B.  (s+1)2/s
  • C.  s/(s+1)
  • D.  s/(s+1)2

33) Given the transfer function of a system. Which of the following characteristics does it have?

  • A.  Over damped
  • B.  Critical damped
  • C.  Under damped
  • D.  any of the above

34) The unit impulse response of second order system is 1/6 * e-0.8t sin(0.6t). THen the natural frequency is

  • A.  1 rad/s
  • B.  2 rad/s
  • C.  0.6 rad/s
  • D.  0.8 rad/s

35) Which of the following transfer functions represent under damped second order systems?

  • A.  1/(s² + s + 1)
  • B.  4/(s² + 2s + 4)
  • C.  2/(s² + 2s + 2)
  • D.  all of the above

36) The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If gain k is increased to infinity, then damping ratio will tend to become

  • A.  infinite
  • B.  0.707
  • C.  unity
  • D.  zero

37) Consider a network function H(s) = 2(s+3)/{(s+2)(s+4)}. What is the steady state response due to step input?

  • A.  4/3
  • B.  1/2
  • C.  1
  • D.  3/4

38) The system function N(s) = V(s)/I(s) = (s+3)/(4s+5). The system is initially at rest. If the excitation i(t) is a unit step, which of the following is the initial value?

  • A.  0
  • B.  3/5
  • C.  1/4
  • D.  3/9

39) The open loop transfer function for unity feedback system is given by 5(1+0.1s) / (s(1+5s)(1+20s)) Find the steady state error for a step input of magnitude 10 is equal to

  • A.  zero.
  • B.  2.
  • C.  infinite.
  • D.  5.

40) The input-output relationship of a linear time invariant continuous time system is given by r(t) = d²c(t)/dt² + 3 dc(t)/dt + 2 c(t) Where r(t) and c(t) are input and output respectively. What is the transfer function of the system equal to?

  • A.  1/(s² + s + 2)
  • B.  1/(s² + 3s + 2)
  • C.  2/(s² + 3s + 2)
  • D.  2/(s² + s + 2)

41) The open loop transfer function for unity feedback system is given by Find the steady state error for a ramp input of magnitude 10?

  • A.  0
  • B.  2
  • C.  5
  • D.  infinite

42) The system function N(s) = V(s)/I(s) = (s+3)/(4s+5). The system is initially at rest. If the excitation i(t) is a unit step, which of the following is the final value?

  • A.  1/4
  • B.  3/5
  • C.  1
  • D.  0

43) Find the Laplace transform for sinωt?

  • A.  1/s
  • B.  1/s²
  • C.  s/(s²+ω²)
  • D.  ω/(s²+ω²)

44) Given a unity feedback system with G(s) = k/s(s+4), the value of k for damping ratio of 0.5 is

  • A.  1
  • B.  4
  • C.  16
  • D.  64

45) The type number of the control system with G(s) = k(s+2)/(s(s²+2s+3) is

  • A.  0
  • B.  1
  • C.  2
  • D.  3

46) For type 1 system with parabolic input, the steady state error is

  • A.  zero.
  • B.  finite constant.
  • C.  infinite.
  • D.  indeterminate.

47) what is the Laplace transform of a function δ(t-2)?

  • A.  2
  • B.  0
  • C.  2s
  • D.  e-2s

48) The impulse response of a linear system is e-t, (t > 0). The corresponding transfer function is

  • A.  1/s(s+1)
  • B.  1/(s+1)
  • C.  1/s
  • D.  s/(s+1)

49) A lead compensator used for a closed loop controller has the following transfer function For such a lead compensator

  • A.  a < b.
  • B.  b < a.
  • C.  a > kb.
  • D.  a < kb.

50) The transfer functions of two compensators are given below. Which one is correct? which one is correct?

  • A.   C1 is a lag compensator and C2 i
  • B.   C1 is a lead compensator and C2 i
  • C.   Both C1 and C2 are lead compensator.
  • D.   Both C1 and C2 are lag compensator.

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