Related Questions

Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?
A Low cost
B Wide speed range
C Stability
D High starting torque
Which of the following motors is preferred for traction work?
A Universal motor
B D.C. series motor
C Synchronous motor
D Three-phase induction motor
Which of the following motors is preferred when quick speed reversal is the main consideration?
A Squirrel cage induction motor
B Wound rotor induction motor
C Synchronous motor
D D.C. motor
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
For which of the following applications D.C. motors are still preferred?
A High efficiency operation
B Reversibility
C Variable speed drive
D High starting torque
Which of the following motors is preferred when smooth and precise speed control over a wide range is desired?
A D.C. motor
B Squirrel cage induction motor
C Wound rotor induction motor
D Synchronous motor
Which of the following motors is preferred for boom hoist of a traveling crane?
A Single phase motor
B Synchronous motor
C A.slip ring motor
D Ward-Leonard controlled D.C. shunt motor
Which of the following motors is usually preferred for kiln drives?
A Cascade controlled A.C. motor
B Slip ring induction motor
C Three phase shunt wound commutator motor
D Any of the above
For a motor-generator set which of the following motors will be preferred?
A Synchronous motor
B Slip ring induction motor
C Pole changing induction motor
D Squirrel cage induction motor
Why are the D.C. motors preferred for traction applications?
A Torque and speed are inversely proportional to armature current
B Torque is proportional to armature current
C Torque is proportional to square root of armature current
D The speed is inversely proportional to the torque and the torque is proportional to square of armature current

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