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Heating And Welding(Engineering > Electrical Engineering ) Questions and Answers
Home
Topic
Engineering
Electrical Engineering
Heating And Welding
Question 1.
Radiations from a black body are proportional to
T
T2
T3
T4
Explanation:-
Answer: Option D. ->
T4
Question 2.
Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons?
To avoid initial rush of current
To avoid change in kW rating with temperature
Both (A) and (B)
Either (A) or (B)
Explanation:-
Answer: Option C. ->
Both (A) and (B)
Question 3.
The material of the heating element for a furnace should have
Lower melting point
Higher temperature coefficient
High specific resistance
All of the above
Explanation:-
Answer: Option C. ->
High specific resistance
Question 4.
In induction heating __________ is abnormally high.
Phase angle
Frequency
Current
Voltage
Explanation:-
Answer: Option B. ->
Frequency
Question 5.
For the transmission of heat from one body to another
Temperature of the two bodies must be different
Both bodies must be solids
Both bodies must be in contact
At least one of the bodies must have some source of heating
Explanation:-
Answer: Option A. ->
Temperature of the two bodies must be different
Question 6.
When a body reflects entire radiation incident on it, then it is known as
White body
Grey body
Black body
Transparent body
Explanation:-
Answer: Option A. ->
White body
Question 7.
Heat transfer by condition will not occur when
Bodies are kept in vacuum
Bodies are immersed in water
Bodies are exposed to thermal radiations
Temperatures of the two bodies are identical
Explanation:-
Answer: Option D. ->
Temperatures of the two bodies are identical
Question 8.
A perfect black body is one that
Transmits all incident radiations
Absorbs all incident radiations
Reflects all incident radiations
Absorbs, reflects and transmits all incident radiations
Explanation:-
Answer: Option B. ->
Absorbs all incident radiations
Question 9.
For heating element high resistivity material is chosen to
Reduce the length of heating element
Increase the life of the heating element
Reduce the effect of oxidation
Produce large amount of heat
Explanation:-
Answer: Option A. ->
Reduce the length of heating element
Question 10.
Which of the following heating methods has maximum power factor?
Arc heating
Dielectric heating
Induction heating
Resistance heating
Explanation:-
Answer: Option D. ->
Resistance heating
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