electrical

Electrical Heating MCQ Questions and Answers Page - 1

1.

Which of the following is an advantage of heating by electricity?

Answer/ Hint      

Answer : D

Explanation :

2.

____________ has the highest value of thermal conductivity.

Answer/ Hint      

Answer : A

Explanation :

3.

Which of the following heating methods has maximum power factor?

Answer/ Hint      

Answer : D

Explanation :

4.

____________ method has leading power factor

Answer/ Hint      

Answer : B

Explanation :

5.

_____________ is used for heating non-conducting materials.

Answer/ Hint      

Answer : D

Explanation :

6.

Which of the following methods of heating is not dependent on the frequency of supply?

Answer/ Hint      

Answer : C

Explanation :

7.

When a body reflects entire radiation incident on it, then it is known as

Answer/ Hint      

Answer : A

Explanation :

8.

For the transmission of heat from one body to another

Answer/ Hint      

Answer : A

Explanation :

9.

Heat transfer by condition will not occur when

Answer/ Hint      

Answer : D

Explanation :

10.

A perfect black body is one that

Answer/ Hint      

Answer : B

Explanation :

11.

Heat is transferred simultaneously by condition, convection and radiation

Answer/ Hint      

Answer : A

Explanation :

12.

The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as

Answer/ Hint      

Answer : A

Explanation :

13.

Which of the following has the highest value of thermal conductivity?

Answer/ Hint      

Answer : C

Explanation :

14.

Induction heating process is based on which of the following principles?

Answer/ Hint      

Answer : D

Explanation :

15.

Which of the following insulating materials is suitable for low temperature applications?

Answer/ Hint      

Answer : B

Explanation :

16.

A non-dimensional number generally associated with natural convection heat transfer is

Answer/ Hint      

Answer : B

Explanation :

17.

The temperature inside a furnace is usually measured by which of the following?

Answer/ Hint      

Answer : A

Explanation :

18.

Which of the following will happen if the thickness of refractory wall of furnace is increased?

Answer/ Hint      

Answer : C

Explanation :

19.

The material of the heating element for a furnace should have

Answer/ Hint      

Answer : C

Explanation :

20.

In a resistance furnace the atmosphere is ____________

Answer/ Hint      

Answer : A

Explanation :

21.

By which of the following methods the temperature inside a resistance furnace can be varied?

Answer/ Hint      

Answer : D

Explanation :

22.

In induction heating _____________ is abnormally high

Answer/ Hint      

Answer : B

Explanation :

23.

By the use of which of the following, high frequency power supply for induction furnaces can be obtained?

Answer/ Hint      

Answer : C

Explanation :

24.

Induction furnaces are employed for which of the following?

Answer/ Hint      

Answer : A

Explanation :

25.

In an electric room heat convector, the method of heating used is

Answer/ Hint      

Answer : B

Explanation :

26.

In a domestic cake baking oven the temperature is controlled by

Answer/ Hint      

Answer : D

Explanation :

27.

In an electric press mica is used

Answer/ Hint      

Answer : A

Explanation :

28.

Induction heating takes place in which of the following?

Answer/ Hint      

Answer : D

Explanation :

29.

For heating element high resistivity material is chosen to

Answer/ Hint      

Answer : A

Explanation :

30.

In resistance heating highest working temperature is obtained from heating elements made of ____________

Answer/ Hint      

Answer : C

Explanation :

31.

For intermittent work which of the following furnaces is suitable?

Answer/ Hint      

Answer : A

Explanation :

32.

Due to which of the following reasons it is desirable to have short arc length?

Answer/ Hint      

Answer : D

Explanation :

33.

In the indirect resistance heating method, maximum heat-transfer takes place by

Answer/ Hint      

Answer : A

Explanation :

34.

Property of low temperature co-efficient of heating element is desired due to which of the following reasons?

Answer/ Hint      

Answer : C

Explanation :

35.

Which of the following methods is used to control temperature in resistance furnaces?

Answer/ Hint      

Answer : D

Explanation :

36.

It is desirable to operate the arc furnaces at power factor of

Answer/ Hint      

Answer : B

Explanation :

37.

Radiations from a black body are proportional to

Answer/ Hint      

Answer : D

Explanation :

38.

In arc furnace the function of choke is

Answer/ Hint      

Answer : A

Explanation :

39.

Ajax Wyatt furnace is started when

Answer/ Hint      

Answer : B

Explanation :

40.

In electric press, mica is used because it is ___________ conductor of heat but/and ___________ conductor of electricity.

Answer/ Hint      

Answer : C

Explanation :

<< Previous
Electrical Heating MCQ Questions and Answers Page - 1
Next >>