Heating And Welding Mcqs
Q.1: is used for heating non-conducting materials?-
A. Eddy current heating
B. Arc heating
C. Induction heating
D. Dielectric heating
Q.2: When a body reflects entire radiation incident on it, then it is known as____________?V
A. white body
B. grey body
C. black body
D. transparent body
Q.3: A perfect black body is one that_____________?.
A. transmits all incident radiations!
B. absorbs all incident radiations
C. reflects all incident radiations
D. absorbs, reflects and transmits all incident radiations7
Q.4: For the transmission of heat from one body to another__________?@
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;
Q.5: Heat is transferred simultaneously by condition, convection and radiation_____________?W
A. inside boiler furnaces
B. during melting of ice
C. through the surface of the insulted pipe carrying steam7
D. from refrigerator coils to freezer of a refrigerator4
Q.6: Heat transfer by condition will not occur when____________?;
A. bodies are kept in vacuum
B. bodies are immersed in water
C. bodies are exposed to thermal radiations(
D. temperatures of the two bodies are identical,
Q.7: Which of the following has the highest value of thermal conductivity ?F
A. Water
B. Steam
C. Sold ice
D. Melting ice
Q.8: In a resistance furnace the atmosphere is_____________?7
A. oxidizing
B. deoxidising
C. reducing
D. neutral
Q.9: In induction heating ___________ is abnormally high?4
A. phase angle
B. frequency
C. current
D. voltage
Q.10: By which of the following methods the temperature inside arc nace can be varied ?Q
A. By disconnecting some of the heating elements-
B. By varying the operating voltage
C. By varying the current through heating elements/
D. By any of the above method

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