21. By which of the following methods the temperature inside arc nace can be varied ?
(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
Ans: d
22. In induction heating ______ is abnormally high.
(a) phase angle
(b) frequency
(c) current
(d) voltage
Ans: b
23. By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?
(a) Coreless transformers
(b) Current transformers
(c) Motor-generator set
(d) Multi-phase transformer
Ans: c
24. Induction furnaces are employed for which of the following ?
(a) Heat treatment of castings
(b) Heating of insulators
(c) Melting aluminium
(d) None of the above
Ans: a
25. In an electric room heat convector the method of heating used is
(a) arc heating
(b) resistance heating
(c) induction heating
(d) dielectric heating
Ans: b
26. In a domestic cake baking oven the temperature is controlled by
(a) voltage variation
(b) thermostat
(c) auto-transformer
(d) series-parallel operation
Ans: d
27. In an electric press mica is used
(a) as an insulator
(b) as a device for power factor improvement
(c) for dielectric heating
(d) for induction heating
Ans: a
28. Induction heating takes place iitwhich of the following ?
(a) Insulating materials
(b) Conducting materials which are magnetic
(c) Conducting materials which are non-magnetic
(d) Conducting materials which may or may not be magnetic
Ans: d
29. For heating element high resistivity material is chosen to
(a) reduce the length of heating element
(b) increase the life of the heating element
(c) reduce the effect of oxidation
(d) produce large amount of heat
Ans: a
30. In resistance heating highest working temperature is obtained from heating elements made of
(a) nickel copper
(b) nichrome
(c) silicon carbide
(d) silver
Ans: c
Read more Questions:
Heating and Welding MCQs Part1
Heating and Welding MCQs Part2
Heating and Welding MCQs Part3
Heating and Welding MCQs Part4
Heating and Welding MCQs Part5
(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
Ans: d
22. In induction heating ______ is abnormally high.
(a) phase angle
(b) frequency
(c) current
(d) voltage
Ans: b
23. By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?
(a) Coreless transformers
(b) Current transformers
(c) Motor-generator set
(d) Multi-phase transformer
Ans: c
24. Induction furnaces are employed for which of the following ?
(a) Heat treatment of castings
(b) Heating of insulators
(c) Melting aluminium
(d) None of the above
Ans: a
25. In an electric room heat convector the method of heating used is
(a) arc heating
(b) resistance heating
(c) induction heating
(d) dielectric heating
Ans: b
26. In a domestic cake baking oven the temperature is controlled by
(a) voltage variation
(b) thermostat
(c) auto-transformer
(d) series-parallel operation
Ans: d
27. In an electric press mica is used
(a) as an insulator
(b) as a device for power factor improvement
(c) for dielectric heating
(d) for induction heating
Ans: a
28. Induction heating takes place iitwhich of the following ?
(a) Insulating materials
(b) Conducting materials which are magnetic
(c) Conducting materials which are non-magnetic
(d) Conducting materials which may or may not be magnetic
Ans: d
29. For heating element high resistivity material is chosen to
(a) reduce the length of heating element
(b) increase the life of the heating element
(c) reduce the effect of oxidation
(d) produce large amount of heat
Ans: a
30. In resistance heating highest working temperature is obtained from heating elements made of
(a) nickel copper
(b) nichrome
(c) silicon carbide
(d) silver
Ans: c
Read more Questions:
Heating and Welding MCQs Part1
Heating and Welding MCQs Part2
Heating and Welding MCQs Part3
Heating and Welding MCQs Part4
Heating and Welding MCQs Part5
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