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Machine Design MCQs

Mechanical Engineering Objective Questions

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204. In induction motors, power supply is connected to
A. Rotor only
B. Stator only
C. Both rotor and stator
D. Any one of (a) or (b) above
Discussion
205. The speed of synchronous motor having 8 poles and operating at 50 c/s power supply will be
A. 1000 r.p.m.
B. 600 r.p.m.
C. 750 r.p.m.
D. 800 r.p.m.
Discussion
206. Which is false statement about induction motors
A. Its speed decreases with increase in load
B. Its direction of rotation can be changed by interchanging two phases
C. Its speed can't be controlled without sacrificing efficiency
D. Its starting torque is more than d.c. shunt motor
Discussion
207. The phenomenon of hunting is observed in
A. Induction motors
B. D.C. shunt motors
C. D.C. series motor
D. Synchronous motor
Discussion
208. Helical springs are not subjected to
A. Hoop stress
B. Force 329
C. Deflection
D. Torsional shear stress
Discussion
209. The welding units operate at following power factor
A. 0.3
B. 0.6
C. 0.8
D. 0.9
Discussion
210. For traction applications, following type of motor is used
A. Induction motor
B. Synchronous motor
C. D.C. series motor
D. D.C. shunt motor
Discussion

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