Which of the following motors is preferred when quick speed reversal is the main consideration?

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 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

Randomized quick sort is an extension of quicksort where the pivot is chosen randomly. what is the worst case complexity of sorting a numbers using randomized quick sort?

A

O (n)

B

O (n2)

C

O (n log n)

D

O (n!)

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 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 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

Which of the following motors is preferred when quick speed reversal is the main consideration?

Related Questions