Which of the following motors is used for elevators?

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

Which IS codes gives details about elevators?

A

IS 27752

B

IS 38665

C

IS 14665

D

IS 27855

Which D.C. motor is preferred for elevators?

A

Shunt motor

B

Series motor

C

Differential compound motor

D

Cumulative compound motor

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

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 used in mixies ?

A

Repulsion motor

B

Reluctance motor

C

Hysteresis motor

D

Universal motor

Which of the following motors is usually used in household refrigerators?

A

D.C. shunt motor

B

D.C. series motor

C

Single phase induction motor (split phase start or induction run motor)

D

Reluctance motor

Which of the following motors will be used in electric clocks ?

A

D.C. shunt motor

B

D.C. series motor

C

A.induction motor

D

A.C. synchronous motor

Which of the following motors is used in tape-recorders ?

A

Hysteresis motor

B

Reluctance motor

C

Capacitor-run motor

D

Universal motor

Which of the following motors is used in a situation where load increases with speed ?

A

Induction motor

B

Three-phase series motor

C

Schrage motor

D

Hysteresis motor

Which of the following motors is used for elevators?

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