Q. The ac motor used in servo applications is

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Q. A first-order system has a time constant t. For unit ramp input, the steady state error is

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Q. Consider the following statements relating to synchros

1. Rotor of control transformer is either disc shaped or umbrella shaped
2. Rotor of transmitter has low magnetic reluctance
3. Transmitter and control transformer pair act as error detector

Out of above the correct statements are

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Q. For a second order system the damping factor is varied from 0 to 1. The locus of poles is

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Q. In a synchro transmitter, which coil acts as primary?

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Q. Assertion (A): The transient performance of a control system is generally analysed by using unit step function as reference input.

Reason (R): Impulse is the most common input found in practice.

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Q. If a zero is added to a second order underdamped system

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Q. PID controlled system has

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

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Q. For Bode plot of (1 + jωT) has

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Q. The purpose of series quadrature windings in amplidyne is to

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Q. For the transport lag G(jω) = e^(-jωT), the phase angle

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Q. In classical analogue, torque is analogous to

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Q. The open loop transfer function of a system is K/s(Js+F). If the frequency at the intersection of - 40 dB/decade line and 0 dB line is ω, then

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Q. For low frequencies such that ω << 1/T , the log magnitude of factor 1/(1+jωT) is 0 dB.

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Q. Assertion (A): The closeness of G(jω) locus to (- 1 + j0) point can be used as a measured of margin of stability.

Reason (R): When the G(jω) locus comes close to encircling (- 1 + j0) point the system becomes oscillatory.

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Q. The capacitance of a gas pressure vessel is defined as

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Q. Assertion (A): Integral control action is sometimes called reset control.

Reason (R): Reset rate is expressed as number of repeats per unit time.

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Q. In some on-off controllers a differential gap is provided

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Q. If G(s) = 1/(s³+s²+1), there are

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