Related Questions

Which type of load is offered by cranes and hoists ?
A Gradually varying load
B Non-reversing, no-load start
C Reversing, light start
D Reversing, heavy start
Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of
A D.C. series motor
B D.C. shunt motor
C Induction motor
D All of above motors
Which of the following motors are preferred for overhead traveling cranes?
A Slow speed motors
B Continuous duty motors
C Short time rated motors
D None of the above
Short time rated motors are preferred for overhead traveling cranes
A True
B False
The rated loads of lifting cranes, as percentage of tipping load at specified radius, for crawler-mounted and pneumatic tyre-mounted machines would be respectively
A 80 and 90
B 90 and 80
C 85 and 75
D 75 and 83
Light duty cranes are used in which of the following?
A Power houses
B Pumping stations
C Automobile workshops
D All of the above
The traveling speed of cranes varies from
A 20 to 30 m/s
B 10 to 15 m/s
C 5 to 10 m/s
D 1 to 2.5 m/s
For which of the following applications a D.C. motor is preferred over an A.C. motor?
A Low speed operation
B High speed operation
C Variable speed operation
D Fixed speed operation
If a D.C. motor is to be selected for conveyors, which motor would be preferred ?
A Series motor
B Shunt motor
C Differentially compound motor
D Cumulative compound motor
Slip ring motor is preferred over squirrel cage induction motor where
A High starting torque is required
B Load torque is heavy
C Heavy pull out torque is required
D All of the above

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