A. Precise control
B. Smooth movement
C. Fast speed control
D. All of the above
Related Mcqs:
- For crane travel which of the following motors is normally used ?
A. Synchronous motor
B. D.C. differentially compound motor
C. Ward-Leonard controlled D.C. shunt motor
D. AC. slip ring motor - Which of the following motors is preferred for boom hoist of a travelling crane ?
A. Single phase motor
B. Synchronous motor
C. A.C. slip ring motor
D. Ward-Leonard controlled D.C. shunt motor - The capacity of a crane is expressed in terms of_______________?
A. type of drive
B. span
C. tonnes
D. any of the above - Which of the following motors has series characteristics ?
A. Shaded pole motor
B. Repulsion motor
C. Capacitor start motor
D. None of the above - While selecting motor for an air conditioner which of the following characteristics is of great importance ?
A. Type of bearings
B. Type of enclosure
C. Noise
D. Arrangement for power transmis¬sion
E. None of the above - While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ?
A. Running characteristics
B. Starting characteristics
C. Efficiency
D. Braking - Which of the following motors always starts on load ?
A. Conveyor motor
B. Floor mill motor
C. Fan motor
D. All of the above - The starting torque of a D.C. motor is independent of which of the following?
A. Flux
B. Armature current
C. Flux and armature current
D. Speed - For blowers which of the following motor is preferred ?
A. D.C. series motor
B. D.C. shunt motor
C. Squirrel cage induction motor
D. Wound rotor induction motor - In squirrel cage induction motors which of the following methods of starting cannot be used ?
A. Resistance in rotor circuit
B. Resistance in stator circuit
C. Auto-transformer starting
D. Star-delta starting
