Question 51 : Assertion (A): DC servomotors have practically taken over from AC servomotors in most control application.
Reason (R): Low brush commutator friction and still higher torque/inertia have been achieved in DC servomotors.
1. Both A and R are true and R is correct explanation of A
2. Both A and R are true but R is not correct explanation of A
3. A is true but R is false
4. A is false but R is true
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Question 52 : Which of the following is the input to a controller?
1. Servo signal
2. Desired variable value
3. Error signal
4. Sensed signal
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Question 53 : The on-off controller is a _____ system.
1. Digital
2. Linear
3. Non-linear
4. Discontinuous
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Question 54 : A _____________ restricts air flow.
1. Throttle valve
2. Shuttle valve
3. Directional control valve
4. Single acting cylinder
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Question 55 : PMDC device is commonly employed for:
1. Speed feedback in speed control system
2. Internal velocity feedback loop of a position control system
3. This device is used in both speed feedback and internal velocity feedback control
4. None of the mentioned
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Question 56 : In a stable control system backlash can cause which of the following?
1. Underdamping
2. Overdamping
3. Poor stability at reduced values of open loop gain
4. Low-level oscillations
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Question 57 : The scientific principle that makes hydraulic systems possible is
1. Pascal's principle
2. Boyle's law
3. Bernoulli's principle
4. The fluid flow principle
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Question 58 : The temperature, under thermal and electrical system analogy, is considered analogous to
1. Voltage
2. Current
3. Capacitance
4. Charge
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Question 59 : If a hybrid stepper motor has a rotor pitch of 36º and a step angle of 9º, the number of its phases must be
1. 4
2. 2
3. 3
4. 6
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Question 60 : A stepper motor may be considered as a ____________ converter.
1. Dc to dc
2. Ac to ac
3. Dc to ac
4. Digital-to-analogue
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