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heating and welding MCQs

Practise focused heating and welding questions with marked answers for exam preparation and subject revision.

heating and welding Mcqs
1. The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earths atmosphere is known as_______________?
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A. radiation

B. viscous dissipation

C. ablation

D. irradiation

2. By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?
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A. Current transformers

B. Coreless transformers

C. Multi-phase transformer

D. Motor-generator set
3. For the transmission of heat from one body to another__________?
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A. temperature of the two bodies must be different

B. both bodies must be solids

C. both bodies must be in contact

D. at least one of the bodies must have some source of heating

4. When a body reflects entire radiation incident on it, then it is known as____________?
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A. grey body

B. black body

C. white body

D. transparent body

5. Ajax Wyatt furnace is started when____________?
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A. it is filled above core level

B. it is fully empty

C. it is filled below core level

D. none of the above

6. _________ has the highest value of thermal conductivity?
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A. Brass

B. Copper

C. Steel

D. Aluminium

7. Resistance variation method of temperature control is done by connecting resistance elements in_____________?
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A. series

B. parallel

C. series-parallel connections

D. all of the above ways

E. star-delta connections

8. The material of the heating element for a furnace should have___________?
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A. lower melting point

B. high specific resistance

C. all of the above

D. higher temperature coefficient

9. In heating the ferromagnetic material by induction heating, heat is produced due to_____________?
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A. induced current flow through the charge

B. none of the above factors

C. hysteresis loss taking place below curie temperature

D. due to hysteresis loss as well as eddy current loss takingplace in the charge
10. For radiant heating around 2250C, the heating elements are made of____________?
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A. copper alloy

B. carbon

C. stainless steel alloy

D. tungsten alloy
11. Which of the following is an advantage of heating by electricity ?
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A. All of the above

B. Higher efficiency

C. Absence of flue gases

D. Quicker operation

12. Which of the following is an advantage of eddy current heating ?
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A. Heat at very high rate can be gene-rated

B. All of the above

C. The amount of heat generated can be controlled accurately

D. The area of the surface over which heat is produced can be accurately controlled

13. Which of the following will happen if the thickness of refractory wall of furnace is increased ?
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A. Heat loss through furnace wall will increase

B. Energy consumption will increase

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

D. Temperature inside the furnace will fall

14. Hysteresis loss and eddy current loss are used in____________?
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A. resistance heating

B. induction heating of brass

C. induction heating of steel

D. dielectric heating

15. Which of the following methods of heating is not dependent on the frequency of supply ?
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A. Induction heating

B. All of the above

C. Dielectric heating

D. Electric resistance heating
16. Which of the following heating methods has maximum power factor ?
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A. Arc heating

B. Resistance heating

C. Induction heating

D. Dielectric heating

17. In direct arc furnace, which of the following has high value ?
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A. Power factor

B. All of the above

C. Voltage

D. Current
18. In an electric room heat convector the method of heating used is______________?
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A. induction heating

B. dielectric heating

C. resistance heating

D. arc heating

19. In resistance heating highest working temperature is obtained from heating elements made of_____________?
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A. silicon carbide

B. nickel copper

C. silver

D. nichrome

20. A non-dimensional number generally associated with natural convection heat transfer is____________?
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A. Prandtl number

B. Pecelet number

C. Grashoff number

D. Nusselt number