Mcq Electrical engineering
1. The insulating material suitable for low temperature applications is
(a) cork.
(b) diatomaceous earth.
(c) asbestos paper
(d) 75 percent magnesia,
2. The quantity of heat absorbed from the heater by convection dopends upon
(A) the temperature of heating element above the surroundings
(b) the surface area of the heater.
(c) the position of the heater
(d) all of the above
3.The material of the heating element should be
(a) such that it may withstand the required temperature without getting oxidised.
(b) of low resistivity.
(c) of low melting point
(d) of high temperature coefficient,
4. The material to be used for heating element should be of high resistivity so as to
(a) increase the life of the heating element. (b) reduce the length of the heating element.
(c) reduce the effect of oxidation
(d) produce large amount of heat.
5. The material to be used for heating element should be of low temperature coefficient so as to
(a) void initial rush of current.
(b) avoid change in kW rating with temperature
(c) reduce the effect of oxidation
(d) both (a) and (b) above.
6.Which of the following heating element will have the least temperature range ?
(a) Eureka
(b) Silicon carbon
(c) Nichrome. (d: Kanthal.
