Which of the following is not correct for two phase servomotor? - Automatic Control Systems

Electronics and Communication Engineering (ECE) : Automatic Control Systems - Quiz(MCQ)

Which of the following is not correct for two phase servomotor?

A)

Rotor resistance is low

B)

Rotor diameter is small

C)

Torque speed curve is linear

D)

Applied voltages are seldom balanced

Correct Answer : Option (A) : Rotor resistance is low

Explanation : In this motor ratio X/R is small or R is high.

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For a quadratic factor in denominator of transfer function the phase angle at corner frequency (in Bode phase angle plot)

A)

is +90Â°

B)

is -90Â°

C)

depends on the damping factor

D)

None of the above

Correct Answer : is -90Â°

The response to sinusoidal excitation can be found by

A)

setting s = jÏ‰ in the network function

B)

setting s = -jÏ‰ in the network function

C)

taking inverse transform of network function

D)

None of the above

Correct Answer : setting s = jÏ‰ in the network function

The resolution of a wire wound potentiometer is about

A)

5%

B)

1%

C)

0.1%

D)

0.001%

Correct Answer : 0.1%

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