Which D.C. motor is preferred for elevators?

Which IS codes gives details about elevators?

A

IS 27752

B

IS 38665

C

IS 14665

D

IS 27855

Which of the following motors is used for elevators?

A

Induction motor

B

Synchronous motor

C

Capacitor start single phase motor

D

Any of the above

Bucket elevators are used for

A

carrying coal in horizontal direction

B

carrying coal in vertical direction

C

carrying coal in any direction

D

none of the above

Bucket elevators are not suitable for the vertical lifting of __________ materials.

A

Fine (e.g. - 200 mesh size coal)

B

Sticky (e.g. clay paste)

C

Small lumpy (e.g. grains and sand)

D

Free flowing

For which of the following applications a D.C. motor is preferred over an A.C. motor?

A

Low speed operation

B

High speed operation

C

Variable speed operation

D

Fixed speed operation

If a D.C. motor is to be selected for conveyors, which motor would be preferred ?

A

Series motor

B

Shunt motor

C

Differentially compound motor

D

Cumulative compound motor

Slip ring motor is preferred over squirrel cage induction motor where

A

High starting torque is required

B

Load torque is heavy

C

Heavy pull out torque is required

D

All of the above

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is

A

Slop speed operation

B

High starting torque

C

Low windage losses

D

All of the above

A motor pool has 300 vehicles of which 30% are trucks. 20% of all the vehicles in the motor pool are diesel, including 15 trucks. What percent of the motor pool is composed of vehicles that are neither trucks nor diesel?

A

165%

B

90%

C

65%

D

10%

By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

A

Frame

B

Shaft

C

Commutator

D

Stator

Which D.C. motor is preferred for elevators?

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