50 Important Electrical Heating MCQ Question and Answer | PDF Free Download
1.Which devices is necessarily required for automatic temperature control in a furnace?
- AThermostat
- BThermocouple
- CAuto-transformer
- DHeating elements of variable resistance material
2.For radiant heating around 2250 degree Celsius, the heating elements are made of
- ACopper alloy
- BCarbon
- CTungsten alloy
- DStainless steel alloy
3.Which of the following is an advantages of eddy current heating?
- AThe amount of heat generated can be controlled accurately
- BHeat at very high rate can be generated
- CThe area of the surface over which heat is produced can be accurately controlled
- DAll of the above
4.The electrode of a direct arc furnace is made of
- ATungsten
- BGraphite
- CSilver
- DCopper
5.Direct arc furnaces have which of the following power factors?
- AUnity
- BLow, lagging
- CLow, leading
- DAny of the above
6.In direct arc furnace, which of the following has high value?
- ACurrent
- BVoltage
- CPower factor
- DAll of the above