Which of the following motors is usually preferred for kiln drives?

A drives 30 km south. Then he turns right and drives another 30 km. Turning left from here. he drives 20 km. finally turning left, he drives 30 km. How far is A from his starting position?

A

30 km

B

20 km

C

80 km

D

None of above.

DOS uses letters of the alphabet to designate disk drives. How many disk drives can DOS address (recognize)?

A

4

B

26

C

1

D

16

E

None of the above

The ratio of driving tensions in V-belt drives is __________ flat belt drives.

A

Equal to

B

sin$$\,\alpha $$ times more than

C

sin$$\,\alpha $$ times less than

D

cosec$$\,\alpha $$ times more than

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

Is preferred for automatic drives.

A

Squirrel cage induction motor

B

Synchronous motors

C

Ward Leonard controlled D.motors

D

Any of the above

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 usually preferred for kiln drives?

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