In a transformer the resistance between its primary and secondary should be
A). zero
B). 10 Q
C). 1000 Q
D). infinity
2. Which of the following medium is employed for extinction of arc in air circuit breaker ?
3. A star circuit has element of resistance R/2. The equivalent delta elements will be
4. Power factor of an electrical circuit is equal to
5. In a series L-C circuit at the resonant frequency the
6. Which of the following statement is true regarding Kirchhoff’s laws in magnetic circuits?
7. Coupling into and out of a traveling-wave tube can be accompanied by a
8. By which of the following methods string efficiency can be improved?
10. If an inductance is connected in one arm of bridge and resistances in the remaining three arms