Q. In a lag network the input frequency is 100 fc where fc is critical frequency. The voltage gain is

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Q. Assertion (A): Temperature control of the passenger compartment of car uses both feed forward and feedback controls.

Reason (R): Feed forward control gives corrective action before the disturbance affects the output and feedback control applies corrective action after output changes.

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Q. Assertion (A): Most of actual systems are non-linear.

Reason (R): Non linearity may be due to saturation, dead zone, square law etc.

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Q. The correct sequence of events to improve system stability is

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Q. Assertion (A): For an underdamped system with damping ratio ξ, the maximum overshoot is e-ξπ/(1-ξ²)^0.5

Reason (R): Peak time of a second order under damped system = π/ωd where ωd is frequency of damped oscillations.

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Q. I-PD controlled system has

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Q. Assertion (A): Laplace transform of impulse function is equal to area under the impulse.

Reason (R): An impulse function whose area is unity is called unit impulse function.

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Q. Optical encoders most commonly used in control systems are

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Q. A second order system exhibits 100% overshoot. The damping ratio is

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Q. The log magnitude curve for a constant gain K is a horizontal straight line at a magnitude 20 log K dB.

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Q. Transfer functions of even complicated components can be found by frequency response tests.

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Q. Assertion (A): Feedback control systems offer more accurate control than open loop systems.

Reason (R): The feedback path establishes a link for comparison of input and output and subsequent error correction.

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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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