Salient Pole Type Rotor - Synchronous Generator - MCQs with answers

Salient Pole Type Rotor - Synchronous Generator - MCQs with answers

Q1. In synchronous machine, poles are made up of thick steel laminations. In salient pole type rotor

a. Poles are projected out from the surface of the rotor
b. The unslotted portions of the cylinder itself acts as the poles
c. Both (a) and (b)
d. None of the above

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Q2. Salient pole type rotors are generally used for the range of 125 rpm to 500 rpm. The limiting factor for the size of the rotor is the

a. Rotating field type construction
b. Rotating armature type construction
c. Centrifugal force acting on the rotating member
d. All of above

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Q3. The prime movers used to drive projected pole type alternator is

a. Water turbines
b. I.C. engines
c. Steam turbines
d. both (a) and (b)

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Q4. Separate damper winding is necessary in

a. Smooth cylindrical type rotor
b. Salient pole type rotor
c. Both (a) & (b)
d. None of these

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Q5. Generally, in alternator divided winding rotor is preferred to a conventional winding rotor, because it gives

a. Better damping
b. Less harmonics
c. More efficiency
d. None of these

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Q6. The air gap in a salient pole machine is

a. Maximum at the center of poles
b. Least at the center of poles and increases while moving away from the center
c. Maximum at the center and decreases while moving away from the center
d. Equally distributed

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