Electronics and Communication Engineering - Automatic Control Systems

1. 

If a zero is added to a second order underdamped system

A. the peak overshoot is increased
B. the peak overshoot is decreased
C. the peak overshoot remains unchanged
D. either (a) or (b)

Answer: Option A

Explanation:

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2. 

PID controlled system has

A. P and I actions in forward path and D action in feedback path
B. P and I actions in feedback path and actions in forward path
C. All the three (i.e., P, I and D) actions in forward path
D. All the three (i.e., P, I and D) actions in feedback path

Answer: Option A

Explanation:

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3. 

In case of synchro error detector the electrical zero position of control transformer is obtained when angular displacement between rotors is

A. zero
B. 45°
C. 90°
D. 180°

Answer: Option C

Explanation:

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4. 

If ΔP is pressure difference, A is area of each flat surface, K is stiffness and Δx is displacement of movable surface from reference of bellows, then

A.
B.
C.
D.

Answer: Option C

Explanation:

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5. 

For Bode plot of (1 + jωT) has

A. slope of 20 dB/decade and phase angle + tan-1 (ωT)
B. slope of - 20 dB/decade and phase angle + tan-1 (ωT)
C. slope of 20 dB/decade and phase angle - tan-1 (ωT)
D. slope of - 40 dB/decade and phase angle - tan-1(ωT)

Answer: Option A

Explanation:

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