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Quiz 2
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Q.1
________ has the highest value of thermal conductivity.
Copper
Aluminium
Brass
Steel
Q.2
Heat is transferred simultaneously by condition, convection and radiation
Inside boiler furnaces
During melting of ice
Through the surface of the insulted pipe carrying steam
From refrigerator coils to freezer of a refrigerator
Q.3
For radiant heating around 2250°C, the heating elements are made of
Copper alloy
Carbon
Tungsten alloy
Stainless steel alloy
Q.4
Induction heating takes place in which of the following?
Insulating materials
Conducting materials which are magnetic
Conducting materials which are nonmagnetic
Conducting materials which may or may not be magnetic
Q.5
In electric press, mica is used because it is _______ conductor of heat but/and________ conductor of electricity.
bad, good
bad, bad
good, bad
good, good
Q.6
In resistance heating highest working temperature is obtained from heating elements made of
Nickel copper
Nichrome
Silicon carbide
Silver
Q.7
A non-dimensional number generally associated with natural convection heat transfer is
Prandtl number
Grashoff number
Peclet number
Nusselt number
Q.8
The electrode of a direct arc furnace is made of
Tungsten
Graphite
Silver
Copper
Q.9
In an electric press mica is used
As an insulator
As a device for power factor improvement
For dielectric heating
For induction heating
Q.10
Which of the following insulating materials was suitable for low temperature applications?
80 percent magnesia
Asbestos paper
Diatomaceous earth
Cork
Q.11
By which of the following methods the temperature inside arcane can be varied?
By disconnecting some of the heating elements
By varying the operating voltage
By varying the current through heating elements
By any of the above method
Q.12
When a body reflects entire radiation incident on it, then it is known as
White body
Grey body
Black body
Transparent body
Q.13
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
Q.14
Which of the following has the highest value of thermal conductivity?
Water
Steam
Solid ice
Melting ice
Q.15
Hysteresis loss and eddy current loss are used in
Induction heating of steel
Dielectric heating
Induction heating of brass
Resistance heating
Q.16
In an electric room heat convector the method of heating used is
Arc heating
Resistance heating
Induction heating
Dielectric heating
Q.17
Method has leading power factor
Resistance heating
Dielectric heating
Arc heating
Induction heating
Q.18
The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth?s atmosphere is known as
Ablation
Radiation
Viscous dissipation
Irradiation
Q.19
Ajax Wyatt furnace is started when
It is filled below core level
It is filled above core level
It is fully empty
None of the above
Q.20
In a resistance furnace the atmosphere is
Oxidizing
Deoxidizing
Reducing
Neutral
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