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Heating and Welding

Study 50 Electrical Engineering MCQs with correct answers and explanations.

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1Electrical EngineeringMedium

For heating element high resistivity material is chosen to________?

Aproduce large amount of heat

Bincrease the life of the heating element

Creduce the length of heating element

Dreduce the effect of oxidation

Correct answer

C. reduce the length of heating element

Explanation

The correct answer is reduce the length of heating element.

2Electrical EngineeringMedium

In direct arc furnace, which of the following has high value?

AAll of the above

BCurrent

CPower factor

DVoltage

Correct answer

B. Current

Explanation

The correct answer is Current.

3Electrical EngineeringMedium

method has leading power factor________?

ADielectric heating

BInduction heating

CResistance heating

DArc heating

Correct answer

A. Dielectric heating

Explanation

The correct answer is Dielectric heating.

4Electrical EngineeringMedium

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

ASteam

BSold ice

CMelting ice

DWater

Correct answer

B. Sold ice

Explanation

The correct answer is Sold ice.

5Electrical EngineeringMedium

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

ATemperature on the outer surface of furnace walls will drop

BEnergy consumption will increase

CHeat loss through furnace wall will increase

DTemperature inside the furnace will fall

Correct answer

A. Temperature on the outer surface of furnace walls will drop

Explanation

The correct answer is Temperature on the outer surface of furnace walls will drop.

6Electrical EngineeringMedium

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

ATo achieve better heating

BTo have better stirring action

CAll of the above

DTo reduce problem of oxidation

ETo increase the life of roof refractory

Correct answer

C. All of the above

Explanation

The correct answer is All of the above.

7Electrical EngineeringMedium

Which of the following heating methods has maximum power factor?

ADielectric heating

BArc heating

CResistance heating

DInduction heating

Correct answer

C. Resistance heating

Explanation

The correct answer is Resistance heating.

8Electrical EngineeringMedium

For the transmission of heat from one body to another________?

Atemperature of the two bodies must be different

Bboth bodies must be in contact

Cboth bodies must be solids

Dat least one of the bodies must have some source of heating

Correct answer

A. temperature of the two bodies must be different

Explanation

The correct answer is temperature of the two bodies must be different.

9Electrical EngineeringMedium

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

AResistance heating principle

BNucleate heating principle

CElectro-magnetic induction princi¬ple

DThermal ion release principle

Correct answer

C. Electro-magnetic induction princi¬ple

Explanation

The correct answer is Electro-magnetic induction princi¬ple.

10Electrical EngineeringMedium

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

AInduction heating

BAll of the above

CDielectric heating

DElectric resistance heating

Correct answer

D. Electric resistance heating

Explanation

The correct answer is Electric resistance heating.

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

ATemperature on the outer surface of furnace walls will drop

BEnergy consumption will increase

CHeat loss through furnace wall will increase

DTemperature inside the furnace will fall

Correct answer

A. Temperature on the outer surface of furnace walls will drop

Explanation

The correct answer is Temperature on the outer surface of furnace walls will drop.

For the transmission of heat from one body to another________?

Atemperature of the two bodies must be different

Bboth bodies must be in contact

Cboth bodies must be solids

Dat least one of the bodies must have some source of heating

Correct answer

A. temperature of the two bodies must be different

Explanation

The correct answer is temperature of the two bodies must be different.