Which of the following happens when star-delta starter is used?

A direct on line starter is used: for starting motors

A

Up to 5 H.P.

B

Up to 10 H.P.

C

Up to 15 H.P.

D

Up to 20 H.P.

Three point starter can be used for

A

Series motor only

B

Shunt motor only

C

Compound motor only

D

Both shunt and compound motor

Reduced voltage starter can be used with

A

Slip ring motor only but not with squirrel cage induction motor

B

Squirrel cage induction motor only but not with slip ring motor

C

Squirrel cage as well as slip ring induction motor

D

None of the above

For starting a D.C. motor a starter is required because

A

It limits the speed of the motor

B

It limits the starting current to a safe value

C

It starts the motor

D

None of the above

The coils of D.C. motor starter are wound with wire of

A

Copper

B

Kanthal

C

Manganin

D

Nichrome

A three point starter is considered suitable for

A

Shunt motors

B

Shunt as well as compound motors

C

Shunt, compound and series motors

D

All D.C. motors

In a manual shunt motor starter

A

Over load relay is connected in series and no volt relay in parallel with the load

B

Over load relay is connected in parallel and no volt relay in series with the load

C

Over load relay and no volt relay are both connected in series with the load

D

Over load relay and no volt relay are both connected in parallel with the load

It is advisable to avoid line starting of induction motor and use starter because

A

It will run in reverse direction

B

It will pick up very high speed and may go out of step

C

Motor takes five to seven times its full load current

D

Starting torque is very high

In a star-delta starter of an induction motor

A

Resistance is inserted in the stator

B

Reduced voltage is applied to the stator

C

Resistance is inserted in the rotor

D

Applied voltage per stator phase is 57.7% of the line voltage

The starter motor is driven by

A

Chain drive

B

Gear drive

C

Flat belt drive

D

V-belt drive

Which of the following happens when star-delta starter is used?

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