Smooth Cylindrical Type Rotor - Synchronous Generator - MCQs with answers

Smooth Cylindrical Type Rotor - Synchronous Generator - MCQs with answers

Q1. The diameter and axial length of rotors of smooth cylindrical type rotors are

a. Small diameter, small axial length
b. Large diameter, large axial length
c. Large diameter, small axial length
d. Small diameter, large axial length

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Q2. For high speed alternators or turbo alternators, which type of rotor is generally used?

a. Salient pole type
b. Projected pole type
c. Smooth cylindrical type
d. Both (a) & (b)

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Q3. The phasor addition of stator and rotor mmfs is possible in a smooth cylindrical synchronous generator because

a. Mmfs of stator and rotor are stationary with respect to each other
b. Mmf of stator is stationary and that of rotor is rotating
c. Mmf of stator is rotating and that of rotor is stationary
d. None of these

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Q4. The prime movers which are used to drive non projected type rotors are

a. I.C. engines
b. Electric motors
c. Steam turbines
d. Both (b) & (c)

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Q5. In the brushless excitation system of synchronous generator, the feedback of output voltage of alternator is taken and given to the

a. Rotating armature a.c. excitor
b. Diode rectifier
c. Main alternator field
d. Magnetic amplifier

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