The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
A). lubricate the contacts
B). insulate the contacts from switch body
C). extinguish the arc
D). all of the above
E). none of the above
1. The property of a capacitor to store electricity is called its
2. The gate voltage in a JFET at which drain current becomes zero is called ___________ voltage
3. In an AM wave, the majority of the power is in ___________
4. In a multivibrator, we have ___________ feedback.
5. Which one of the following effects is used in measuring power?
6. The frequency of domestic power supply in India is
7. A trivalent impurity has valence electrons
8. Materials with lots of free electrons are called
10. Short circuit test on transformers is conducted to determine