Electrical engineering

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.