BARC 2018 ECE: Control Systems Nuclear Quiz 2

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Question 1

The block diagram of a system is shown below

In order to reduce the effect of noise element:

• AThe feedback gain should be increased.
• BThe forward gain should be increased.
• CThe forward gain should be increased.
• DBoth the gain and should be increased.

Question 2

A two-loop position control system is shown below.

The gain k of the Tacho-generator influences mainly the

• Apeak overshoot
• Bnatural frequency of oscillation
• Cphase shift of the closed loop Transfer Function at very low frequencies (ω →0)
• Dphase shift of the closed loop Transfer Function at very high frequencies (ω →∞)

Question 3

A system with transfer function

is excited by sin (ωt). The steady-state output of the system is zero at

• Aω = 1 rad/s
• Bω = 2 rad/s
• Cω = 3 rad/s
• Dω = 4 rad/s

Question 4

Match the compensator with their circuits?
List – I(Compensator)
1. PI Compensator
2. Lag Compensator
3. PD Compensator
4. Lead Compensator
List – II(Circuits)
A)
B)
C)
D)

• A1-A, 2-B, 3-C, 4-D
• B1-A, 2-D, 3-C, 4-B
• C1-D, 2-C, 3-B, 4-A
• D1-C, 2-B, 3-A, 4-D

Question 5

The Bode plot of a transfer function is given where G_V = 2.0, G_M = 0.25 and G_C =K_C. Find the maximum value of K_c for stable system?

• A3.17
• B3.75
• C1.69
• D4.25

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