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Electrical Engineering
Heating And Welding
Quiz 5
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Q.1
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.2
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.3
Induction furnaces are employed for which of the following?
Heat treatment of castings
Heating of insulators
Melting aluminium
None of the above
Q.4
Radiant heating is used for which of the following?
Annealing of metals
Melting of ferrous metals
Heating of liquids in electric kettle
Drying of paints and varnishes
Q.5
The temperature inside a furnace is usually measured by which of the following?
Optical pyrometer
Mercury thermometer
Alcohol thermometer
Any of the above
Q.6
By the use of which of the following, high frequency power supply for induction furnaces can be obtained?
Coreless transformers
Current transformers
Motor-generator set
Multiphase transformer
Q.7
In a resistance furnace the atmosphere is
Oxidizing
Deoxidizing
Reducing
Neutral
Q.8
In an electric press mica is used
As an insulator
As a device for power factor improvement
For dielectric heating
For induction heating
Q.9
The electrode of a direct arc furnace is made of
Tungsten
Graphite
Silver
Copper
Q.10
Which of the following heating methods has maximum power factor?
Arc heating
Dielectric heating
Induction heating
Resistance heating
Q.11
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.12
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
Q.13
The material of the heating element for a furnace should have
Lower melting point
Higher temperature coefficient
High specific resistance
All of the above
Q.14
Radiations from a black body are proportional to
T
T2
T3
T4
Q.15
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)
Q.16
In induction heating __________ is abnormally high.
Phase angle
Frequency
Current
Voltage
Q.17
welding methods where fusion is achieved by heating the materials to be joined using an electric arc(s). This may be done with or without filler material.
flux
solldering
Brazing
mig Welding
arc welding
Q.18
The temperature that needs to be reached to allow metal to begin to liquefy.
tempering
soldering
liquidus
melting point
solidus
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