Question: Which of the following heating methods has maximum power factor ?
- 1. Arc heating
- 2. Dielectric heating
- 3. Induction heating
- 4. Resistance heating
Question: Which of the following is an advantage of heating by electricity ?
- 1. Quicker operation
- 2. Higher efficiency
- 3. Absence of flue gases
- 4. All of the above
Question: method has leading power factor____________?
- 1. Resistance heating
- 2. Dielectric heating
- 3. Arc heating
- 4. Induction heating
Question: Which of the following methods of heating is not dependent on the frequency of supply ?
- 1. Induction heating
- 2. Dielectric heating
- 3. Electric resistance heating
- 4. All of the above
Question: Average resistance of human body is____________?
- 1. 500 ohms
- 2. 1000 ohms
- 3. 1500 ohms
- 4. 2000 ohms
Question: Ground resistance should be designed such that_____________?
- 1. grounding resistance should be as low as possible
- 2. grounding resistance should be as high as possible
- 3. grounding resistance should be always zero
- 4. none of the above
Question: When earth fault occurs______________?
- 1. voltage potential at the earth mat increases due to grounding
- 2. voltage potential at the earth mat decreases due to grounding
- 3. voltage potential at the earth mat remains zero irrespective of fault
- 4. none of the above
Question: Moisture content in the soil __________ the earth soil resistance?
- 1. increase
- 2. decrease
- 3. does not affect
- 4. none of the above
Question: For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________?
- 1. to provide low impedance
- 2. to discharge the charging capacitance to ground
- 3. protection for operating personnel
- 4. both (B) and (C)
Question: The objective of earthing or grounding is_______________?
- 1. to provide as low resistance possible to the ground
- 2. to provide as high resistance possible to the ground
- 3. to provide flow of positive, negative and zero sequence currents
- 4. none of the above
