check

MCQ'S TCC Curves for Selective Coordination

 If you think you have a good understanding of TCC Curves for Selective Coordination,  challenge yourself and take our quiz. 

 

 

Best of Luck.!!

Start

Question 1 of 18

Which characteristic of power system protection defines the accuracy of the protection device?

A

Selectivity

B

Sensitivity

C

Speed

D

None of the above

Question 2 of 18

The protection system should not exceed ____ % of the overall cost.

 

A

40

B

35

C

30

D

25

Question 3 of 18

The primary objective of the power system protection is :

A

To sense fault

B

To isolate faulty part from the healthy part

C

Both (a) and (b)

D

None of the above

Question 4 of 18

Which statement is correct about a relay?

A

Relay’s TCCs are thinner and sharper than fuse and breaker TCCs

B

Relay sense faults only

C

Relay isolates fault

D

Both (a) and (b)

Question 5 of 18

In solid-state breakers, the instantaneous pickup is ____ times of long time ampere rating:

A

1.5 to 10

B

2 to 40

C

5 to 70

Question 6 of 18

In solid-state breakers, the short time pickup is ____ times of long time ampere rating:

A

1.5 to 10

B

2 to 40

C

5 to 70

Question 7 of 18

In a solid-state relay, short time delay has how many settings are available:

A

1

B

2

C

3

D

4

Question 8 of 18

In the thermal-magnetic breaker, which statement is correct for the magnetic part:

A

It senses high over current and short circuit

B

It has no intentional delay

C

It has a delay

D

both (a) and (b)

Question 9 of 18

Selective coordination is achieved by:

A

Selecting the right protective device

B

By adjusting the time-current curve of the protective device

C

Both (a) & (b)

Question 10 of 18

If a fault occurs in a particular zone:

A

The protective device of that zone will sense the fault

B

The upstream device above that zone will sense the fault

C

The protective device of that zone will clear the fault in the least time

D

All of the above

Question 11 of 18

On Etap, TCCs of a selected system can be achieved by using :

A

Star protective protection tab

B

Short circuit analysis tab

C

Load flow analysis tab

Question 12 of 18

For the selectivity purpose, the pickup setting between an upstream and downstream breaker is set as :

A

Upstream breaker pickup > downstream breaker pickup

B

Upstream breaker pickup < downstream breaker pickup

C

Upstream breaker pickup = downstream breaker pickup

D

Upstream breaker pickup <= downstream breaker pickup

Question 13 of 18

In TCCs, for selectivity purposes on the basis of pickup setting:

A

The upstream breaker curve is located to right of the downstream breaker curve

B

The upstream breaker curve is located to the light of the downstream breaker curve

C

The upstream breaker curve is located lower to the downstream breaker curve

Question 14 of 18

From the selective perspective, time delay of upstream breaker should be:

A

Greater than downstream breaker

B

Less than downstream breaker

C

Equal to downstream breaker

D

Less than or equals to downstream breaker

Question 15 of 18

For accurate selective coordination,  TCCs should line up in from left to right or bottom to top in the sequence of:

A

Source to load

B

Load to source

C

Can be both (a) and (b)

D

None of the above

Question 16 of 18

Fuse TCCs consist of how many line bands?

A

One

B

Two

C

Three

D

Four

Question 17 of 18

Cable damage curve is always

A

to the left of circuit breaker TCCs

B

to the right of circuit breaker TCCs

C

in the middle of circuit breaker TCCs

D

No effect of cable damage curve on protective device

Question 18 of 18

Transformer inrush curve is always 

A

to the left and below of circuit breaker TCCs

B

to the right and above of circuit breaker TCCs

C

in the middle of circuit breaker TCCs

D

no effect of transformer inrush curve on protective device

Confirm and Submit