Question 1

To check the contactor using

Accepted Answer

Ohmmeter

Answer

Wattmeter

Answer

Tachometer

Answer

Voltmeter

Question 2

Star-Delta starter is used only for the motors

Accepted Answer

More than 5 H.P

Answer

Single phase motor

Answer

Less than 5 H.P

Answer

Less than 1 H.P

Question 3

To check the push button (N/C) the reading of ohmmeter should be R =

Accepted Answer

Zero

Answer

20 ohm

Answer

Infinity

Answer

200 ohm

Question 4

The applications of Star-Delta starter.

Accepted Answer

Compressor

Answer

Thermal and magnetic circuit breaker

Answer

Self  holding contact

Answer

Thermal device

Question 5

In the figure shown: the part label (A) is used to

Accepted Answer

Protect the circuit against overload

Answer

Protect the circuit against open circuit

Answer

Operate the circuit

Answer

Switch off the circuit

Question 6

The numbers of terminals of motor used in Star-Delta starter are

Accepted Answer

6

Answer

3

Answer

8

Answer

4

Question 7

What is this in the figure shown

Accepted Answer

Selector switch

Answer

Float switch

Answer

Limit  switch

Answer

Over load

Question 8

To check the push button (N/O) the reading of ohmmeter should be R =

Accepted Answer

Infinity

Answer

Zero

Answer

150 ohm

Answer

15 ohm

Question 9

Refer to figure shown , Names the parts 1 and 5

Accepted Answer

Thermal over load relay , magnetic coil of contactor

Answer

Start bush button , auxiliary contact

Answer

Auxiliary contact , start bush button

Answer

Stop bush button , start bush button

Question 10

The DOL starter is used to HP

Accepted Answer

Less than 5

Answer

More than 5

Answer

More than 7

Answer

More than 10

Question 11

Switch used in elevator, crane & gate as control circuit.

Accepted Answer

Limit  switch

Answer

float  switch

Answer

knife  switch

Answer

Isolator

Question 12

To check the float switch contacts the reading of multi meter should be R =

Accepted Answer

zero N/C and infinity N/O

Answer

infinity

Answer

value

Answer

zero

Question 13

The numbers of terminals of motor used in  DOL starter are

Accepted Answer

3

Answer

4

Answer

6

Answer

8

Question 14

To Provides protection against over load and short circuit

Accepted Answer

Miniature circuit breaker

Answer

Switches

Answer

Contactor

Answer

Limit switch

Question 15

In the circuit shown: name part number (1) is

Accepted Answer

Three phase induction motor

Answer

Start bush button

Answer

Thermal over load relay

Answer

Stop bush button

Question 16

In the circuit shown: part number (5) function is

Accepted Answer

Star contactor

Answer

Delta contactor

Answer

Thermal over load relay

Answer

Three phase induction motor

Question 17

The control circuit shown in the figure used to

Accepted Answer

Direct on line starter

Answer

Star delta starter

Answer

Lift

Answer

Reverse direction

Question 18

The timer in the star delta starter is used to

Accepted Answer

Convert from star to delta

Answer

Convert Three phase to single phase

Answer

Thermal over load relay

Answer

Convert from delta to star

Question 19

In the circuit shown : the device used to operate the circuit is number

Accepted Answer

3

Answer

2

Answer

1

Answer

4

Question 20

Name of the symbol shown is

Accepted Answer

Overload relay

Answer

Limit switch

Answer

Push button

Answer

MCB

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