Question 21 : DC motors are constructed using Permanent Magnet resulting in:
1. Higher torque/inertia ratio
2. Higher operating frequency
3. No filed losses
4. All of the mentioned
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Question 22 : In a control system the output of the controller is given to
1. Final control element
2. Amplifier
3. Comparator
4. Sensor
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Question 23 : PMDC when coupled to a rotating shaft would generate a voltage proportional to speed and thus would serve as____________
1. Tachometer
2. Servomotor
3. D.C. motor
4. A.C. motor
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Question 24 : Most hydraulic circuits:
1. Operate from a central hydraulic power unit
2. Use air-over-oil power units
3. Have a dedicated power unit
4. Does not have dedicated power unit
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Question 25 : What is the step angle of a permanent-magnet stepper motor having 8 stator poles and 4 rotor poles?
1. 60º
2. 45º
3. 30º
4. 15º
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Question 26 : Due to which of the following reasons excessive band width in control systems should be avoided?
1. It leads to slow speed of response
2. It leads to low relative stability
3. Noise is proportional to bandwidth
4. Presence of feedback
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Question 27 : A stepper motor having a resolution of 300 steps/rev and running at 2400 rpm has a pulse rate of- pps.
1. 4000
2. 8000
3. 6000
4. 10,000
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Question 28 : A controller, essentially, is a
1. Sensor
2. Clipper
3. Comparator
4. Amplifier
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Question 29 : Series circuits work on both hydraulic and pneumatic actuators.
1. True
2. False
3.
4.
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Question 30 : Pneumatic and other power systems can support three kinds of motion; they are
1. Linear, reciprocating, and random motion
2. Linear, flowing, and rotary motion
3. Linear, zigzag, and spiral motion
4. Linear, reciprocating, and rotary motion
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