A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the lowest speed is used for
A) lifting
B) hoisting
C) lowering
D) landing the load.
Correct Answer:
Verified
Q15: 15 minute rated motors are suitable for
A)light
Q16: Light duty cranes are generally used in
A)automobile
Q17: Heavy duty cranes are used in
A)Heavy engineering
Q18: 1/2 hour rated motors are used for
A)light
Q19: Which of the following drive can be
Q20: The number of sets used in pole
Q21: A pole changing type squirrel cage motor
Q23: For handing fragile articles in a crane
A)low
Q24: The range of horse power of electric
Q25: Motors preferred for rolling mill drive is
A)dc
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