Which of the following drive can be used for derricks and winches ?
A) DC motors with Ward Leonard control
B) AC slip-ring motors with variable resistance
C) Pole changing squirrel cage motors
Correct Answer:
Verified
Q14: In overhead traveling cranes
A)continuous duty motors are
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
Q20: The number of sets used in pole
Q21: A pole changing type squirrel cage motor
Q22: 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
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