electrician

MCQ ON ELECTRICAL TRANSFORMER PAGE - 3

1.

In 1 KVA transformer the number of turns per volt is 8 What is the number of turns in high voltage side If the voltage is 110V?

Answer/ Hint      

Answer : B

Explanation :

2.

What is the full load current of 1KVA, 2402 V/ 120V single phase transformer at 0.8 p.f?

Answer/ Hint      

Answer : A

Explanation :

3.

Which among the following transformers, is used for starting the big induction motor?

Answer/ Hint      

Answer : B

Explanation :

4.

As compared to an amplifier, a transformer cannot…

Answer/ Hint      

Answer : B

Explanation :

5.

Which among the following transformers is used for street lights?

Answer/ Hint      

Answer : A

Explanation :

6.

Small type transformer core for shell-type generally used……

Answer/ Hint      

Answer : A

Explanation :

7.

What is the unit of output power consumed during the day taken for calculating the ‘ALL DAY’ efficiency of a transformer

Answer/ Hint      

Answer : D

Explanation :

8.

when two transformers are operating in parallel, they will share the load depending upon their

Answer/ Hint      

Answer : C

Explanation :

9.

the transformers are rated in …

Answer/ Hint      

Answer : B

Explanation :

10.

The color of silica gel in day condition is….

Answer/ Hint      

Answer : B

Explanation :

11.

what is the material used inside the breather to prevent moisture entering the transformer?

Answer/ Hint      

Answer : C

Explanation :

12.

The efficiency of transformers is determined by knowing its input and output power. Unit of power used for this purpose is kVA/kW

what is the unit used for input and output when calculating

Answer/ Hint      

Answer : D

Explanation :

13.

The transformer used in conjunction with voltmeter is called a potential transformer. The standard rating of secondary of potential transformer is …….

Answer/ Hint      

Answer : B

Explanation :

14.

Secondary of a current transformer will have ….

Answer/ Hint      

Answer : C

Explanation :

15.

If the current rating of the installation is high, a current transformer is used in ht energy meter circuit. If a current transformer of 100 A /5A is connected with an energy meter, the multiplying

Answer/ Hint      

Answer : B

Explanation :

16.

In constant voltage transformer at certain induced secondary voltage, the impedance of secondary voltage, the impedance of secondary winding will become equal to impedance of the capacitor across i

Answer/ Hint      

Answer : D

Explanation :

17.

What may be the cause for overheating of a transformer?

Answer/ Hint      

Answer : C

Explanation :

18.

In which part of the distribution transformer, maximum heat occurs?

Answer/ Hint      

Answer : A

Explanation :

19.

What principle makes the instrument transformer working?

Answer/ Hint      

Answer : C

Explanation :

20.

What is the standard value of the secondary current of current transformer?

Answer/ Hint      

Answer : B

Explanation :

21.

Current transformers are classified into five types which type of current transformer (CT) principle sis used in clip on or clamp on Ammeter?

Answer/ Hint      

Answer : C

Explanation :

22.

What is the formula to be used to measure the actual power consumed, when the wattmeter is used along with CT and PT?

Answer/ Hint      

Answer : C

Explanation :

23.

When using a potential transformer, it should be connected to the ….

Answer/ Hint      

Answer : B

Explanation :

24.

What is the standard rating of secondary of potential transformers?

Answer/ Hint      

Answer : A

Explanation :

25.

You find a C.T of 10:1 ratio and P.T and 100:1 ratio and voltmeter of 0 to 110V are also available. The maximum high value of voltage and current that could be measured by using the above is &helli

Answer/ Hint      

Answer : B

Explanation :

26.

The function of a breather in a transformer is

Answer/ Hint      

Answer : B

Explanation :

27.

The function of a breather in a transformer is

Answer/ Hint      

Answer : C

Explanation :

28.

The function of a breather in a transformer is to

Answer/ Hint      

Answer : B

Explanation :

29.

You have to measure the current and voltage of a 3 phase circuit of 6.6kV   and load of 500kVA. In order to use a 5A ammeter and 110 volts voltmeter, what is the ratio of CT and PT requir

Answer/ Hint      

Answer : A

Explanation :

30.

In a small workshop 5 A energy meter is connected through a CT, the meter reader recorded 1000 units for a particular month but , the meter shows only 25 units

What is the current in primar

Answer/ Hint      

Answer : B

Explanation :

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