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Electrical Engineering
Heating And Welding
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Q.1
For intermittent work which of the following furnaces is suitable?
Indirect arc furnace
Core less furnace
Either of the above
None of the above
Q.2
Due to which of the following reasons it is desirable to have short arc length?
To achieve better heating
To increase the life of roof refractory
To have better stirring action
All of the above
Q.3
Resistance variation method of temperature control is done by connecting resistance elements in
Series
Parallel
Series-parallel connections
All of the above ways
Q.4
In heating the ferromagnetic material by induction heating, heat is produced due to
Induced current flow through the charge
Hysteresis loss taking place below Curie temperature
Due to hysteresis loss as well as eddy current loss taking place in the charge
None of the above factors
Q.5
In the indirect resistance heating method, maximum heat-transfer takes place by
Radiation
Convection
Conduction
Any of the above
Q.6
Induction heating process is based on which of the following principles?
Thermal ion release principle
Nucleate heating principle
Resistance heating principle
Electromagnetic induction principle
Q.7
In direct arc furnace, which of the following has high value?
Current
Voltage
Power factor
All of the above
Q.8
Which of the following is an advantage of heating by electricity?
Quicker operation
Higher efficiency
Absence of flue gases
All of the above
Q.9
In a domestic cake baking oven the temperature is controlled by
Voltage variation
Thermostat
Autotransformer
Series-parallel operation
Q.10
________ is used for heating non-conducting materials.
Eddy current heating
Arc heating
Induction heating
Dielectric heating
Q.11
Which of the following devices is necessarily required for automatic temperature control in a furnace?
Thermostat
Thermocouple
Autotransformer
Heating elements of variable resistance material
Q.12
Which of the following methods of heating is not dependent on the frequency of supply?
Induction heating
Dielectric heating
Electric resistance heating
All of the above
Q.13
In arc furnace the function of choke is
To stabilize the arc
To improve power factor
To reduce severity of the surge
None of the above
Q.14
Which of the following is an advantage of eddy current heating?
The amount of heat generated can be controlled accurately
Heat at very high rate can be generated
The area of the surface over which heat is produced can be accurately controlled
All of the above
Q.15
Properly of low temperature coefficient 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
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.17
Induction furnaces are employed for which of the following?
Heat treatment of castings
Heating of insulators
Melting aluminium
None of the above
Q.18
Which of the following will happen if the thickness of refractory wall of furnace is increased?
Heat loss through furnace wall will increase
Temperature inside the furnace will fall
Temperature on the outer surface of furnace walls will drop
Energy consumption will increase
Q.19
Direct arc furnaces have which of the following power factors?
Unity
Low, lagging
Low, leading
Any of the above
Q.20
Induction heating takes place it which of the following?
Insulating materials
Conducting materials which are magnetic
Conducting materials which are non-magnetic
Conducting materials which may or may not be magnetic
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