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Electrical Engineering
Heating And Welding
Quiz 3
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Q.1
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.2
Which of the following methods is used to control temperature in resistance furnaces?
Variation of resistance
Variation of voltage
Periodical switching on and off of the supply
All of the above methods
Q.3
It is desirable to operate the arc furnaces at power factor of
Zero
0.707 lagging
Unity
0.707 leading
Q.4
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
Q.5
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.6
The temperature inside a furnace is usually measured by which of the following?
Optical pyrometer
Mercury thermometer
Alcohol thermometer
Any of the above
Q.7
In an electric room heat convector the method of heating used is Resistance heating
True
False
Q.8
Which of the following heating methods has maximum power factor?
Arc heating
Dielectric heating
Induction heating
Resistance heating
Q.9
What is the code word to notify workers that the machine is about to be on
i'm WORKING HERE
POWER
CLEAR
Q.10
Which of the following is not an important factor when heat treating
the rate the metal is cooled
the tempurature
the method used to heat the metal
material around the metal
Q.11
Which of the following is NOT true about a steel that is quenched and tempered
has good strength
Has good hardness
It is brittle
Q.12
Which result from an oxyacetylene torch test indicates that a metal is not suitable for welding
the metal gives off a lot of sparks
the weld pool is fluid and has good tension
non of the above
Q.13
Which of the following statements is NOT true of nonferrous metals
They have distinctive colors
They are Magnetic
they do not spark
They are soft
Q.14
In direct arc furnace, which of the following has high value?
Current
Voltage
Power factor
All of the above
Q.15
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.16
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.17
In a domestic cake baking oven the temperature is controlled by
Voltage variation
Thermostat
Autotransformer
Series-parallel operation
Q.18
Which of the following is an advantage of heating by electricity?
Quicker operation
Higher efficiency
Absence of flue gases
All of the above
Q.19
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.20
Resistance variation method of temperature control is done by connecting resistance elements in
Series
Parallel
Series-parallel connections
All of the above ways
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