For a motor-generator set which of the following motors will be preferred?

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

Of 30 integers, 12 are in set A , 22 are in set A , 22 are in set B , and 7 are in both set A and B. How many of the integers in NITTHER set A nor set B?

A

4

B

1

C

3

Which of the following motors is preferred for tape-recorders?

A

Shaded pole motor

B

Hysteresis motor

C

Two value capacitor motor

D

Universal motor

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?

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