ONLINE MCQ EE-Electrical Heating 1

1.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

Answer  

2.The material of the heating element for a furnace should have
lower melting point
higher temperature coefficient
high specific resistance
all of the above

Answer  

3.For the transmission of heat from one body to another
temperature of the two bodies must be different
both bodies must be solids
both bodies must be in contact
at least one of the bodies must have some source of heating

Answer  

4.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

Answer 

5.When a body reflects entire radiation incident on it, then it is known as
white body
grey body
black body
transparent body

Answer  

6.The process of heat transfer during the
reentry of satellites and missiles, at very high speeds, into earth’s
atmosphere is known as
ablation
radiation
viscous dissipation
irradiation

Answer  

7.________ has the highest value of thermal conductivity.
Copper
Aluminium
Brass
Steel

Answer  

8.Which of the following insulating materials was suitable for low temperature applications ?
Asbestos paper
Diatomaceous earth
80 percent magnesia
Cork

Answer  

9.By which of the following methods the temperature inside arc furnace 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

Answer  

10.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

Answer

भारतीय संविधान-भारत के नागरिकों के मौलिक अधिकार
EE AND ECE IMPORTANT MCQ-SCR (Silicon Controlled Rectifiers) 1

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