MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
Quiz
Electrical Engineering
Heating And Welding
Quiz 4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Q.1
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.2
In an electric room heat convector the method of heating used is Resistance heating
True
False
Q.3
It is desirable to operate the arc furnaces at power factor of
Zero
0.707 lagging
Unity
0.707 leading
Q.4
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.5
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.6
Which of the following insulating materials was suitable for low temperature applications?
Asbestos paper
Diatomaceous earth
80 percent magnesia
Cork
Q.7
Direct arc furnaces have which of the following power factors?
Unity
Low, lagging
Low, leading
Any of the above
Q.8
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.9
________ is used for heating non-conducting materials.
Eddy current heating
Arc heating
Induction heating
Dielectric heating
Q.10
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.11
In the indirect resistance heating method, maximum heat-transfer takes place by
Radiation
Convection
Conduction
Any of the above
Q.12
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.13
In resistance heating highest working temperature is obtained from heating elements made of
Nickel copper
Nichrome
Silicon carbide
Silver
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
For radiant heating around 2250°C, the heating elements are made of
Copper alloy
Carbon
Tungsten alloy
Stainless steel alloy
Q.17
Hysteresis loss and eddy current loss are used in
Induction heating of steel
Dielectric heating
Induction heating of brass
Resistance heating
Q.18
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.19
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
Q.20
In an electric room heat convector the method of heating used is
Arc heating
Resistance heating
Induction heating
Dielectric heating
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page