183.  The speed of a universal motor is generally reduced by using
A. gear trains
B. V-belts
C. brakes
D. chains

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184.  Which of the following motors can be used for unity power factor?
A. Capacitor run motor
B. Shaded pole motor
C. Hysteresis motor
D. Schrage motor

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185. When a D.C. series motor is connected to A.C. supply, the power factor will be low because of
A. high inductance of field and armature circuits
B. induced current in rotor dueto variations of flux
C. fine copper wire winding
D. none of the above

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186. The direction of rotation of universal motor can be reversed by reversing the flow of current through
A. armature winding
B. field winding
C. either aramture winding or field winding
D. none of the above

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187. In which single-phase motor, the rotor has no teeth or winding?
A. Split phase motor
B. Reluctance motor
C. Hysteresis motor
D. Universal motor

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188. Which motor is normally free from mechanical and magnetic vibrations?
A. Split phase motor
B. Universal motor
C. Hysteresis motor
D. Shaded pole motor

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189.  As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for
A. fans
B. blowers
C. sound equipment
D. mixer grinders

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