The speed of a squirrel-cage induction motor can be controlled by all of the following except

When the equivalent circuit diagram of doouble squirrelcage induction motor is constructed the two cages can be considered

A

in series

B

in parallel

C

in series-parallel

D

in parallel with stator

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

How many flowers are there if all of them are roses except two, all of them are tulips except two and all of them are daisies except two?

A

3

B

6

C

9

D

10

How many flowers are there if all of them are roses except two , all of them are tulips except two and all of them are daisies except two?

A

3

B

6

C

9

D

10

a motor -cycle covers 40 Km with a speed of 20 km /hr. Find the speed of the motor -cycle for the next 40 km journey so that the average speed of the whole journey will be 30 km / hr.

A

70.0km /hr

B

52.5km /hr

C

60.0km/hr

D

60. 5 km / hr

A motor cycle covers 40 km with a speed of 20 km/hr. Find the speed of the motor cycle for the next 40 km journy so that the average speed of the whole journey will be 30 km/hr?

A

70

B

52.5

C

60

D

60.5

The speed characteristics of an induction motor closely resemble the speed-load characteristics of which of the following machines

A

D.C. series motor

B

D.C. shunt motor

C

Universal motor

D

None of the above

While starting a synchronous motor by induction motor action, field winding is usually

A

connected to D.C. supply

B

short-circuited by low resistance

C

kept open-circuited

D

none of the above

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because

A

synchronous motor has no slip

B

stator supply is not required to produce magnetic field

C

mechanical load on the rotor remains constant

D

synchronous motor has large airgap

While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by

A

induction motor torque in field winding

B

induction motor torque in damper winding

C

eddy current and hysteresis torque in pole faces

D

reHetance motor torque due to saliency of the rotor

E

all of the above methods

The speed of a squirrel-cage induction motor can be controlled by all of the following except

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