An ac tachometer has a drag cup construction so that

rotor inertia is low

rotor body is conducting

rotor is easy to fabricate

Both (A) and (B)

Correct Answer : Option (D) : Both (A) and (B)

Recently Updated in Automatic Control Systems Questions

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

is +90°

is -90°

depends on the damping factor

None of the above

Correct Answer : is -90°

The response to sinusoidal excitation can be found by

setting s = jω in the network function

setting s = -jω in the network function

taking inverse transform of network function

None of the above

Correct Answer : setting s = jω in the network function

The resolution of a wire wound potentiometer is about

0.1%

0.001%

Correct Answer : 0.1%