Q. Examine the following statements

1. Pneumatic systems are fire proof.
2. Pneumatic systems are explosion proof.
3. Hydraulic systems are explosion proof.
4. Hydraulic systems are fire proof.

Which of the above statements are correct?

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Q. The addition of a zero to the open loop transfer function

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Q. Assertion (A): For a given system only one of the static error constants is finite and significant.

Reason (R): If finite static error constant is large, the loop gain becomes smaller as ω approaches zero.

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Q. Which of the following represents constant magnitude locus for M = 1?

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Q. Assertion (A): A synchro control transformer has nearly constant impedance across its rotor terminals.

Reason (R): Rotor of a synchro control transformer is cylindrical so as to give uniform flux distribution.

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Q. Generally a servomotor operates at

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Q. If C is thermal capacitance, m is mass of liquid and c is specific heat, then

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Q. In a two phase servomotor, if R is rotor resistance, X is rotor reactance, L is rotor length D is rotor diameter then

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Q. Integral error compensation changes a second order system to

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Q. Assertion (A): If integral control action is included in the controller the offset can be eliminated.

Reason (R): Integral control action may lead to oscillatory response.

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Q. An ac tachometer has a drag cup construction so that

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Q. If G(s)H(S) = K(s+6)/(s+3)(s+5) the breakaway and break in points in the root locus are located at

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Q. The constant M loci on G(s) plane are a family of circles.

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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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