In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable
A). 25, 35
B). 40, 50
C). 60, 70
D). 75, 85
1. When both the inductance and resistance of a coil are doubled the value of
2. The resistance can be measured most accurately by
5. For the same H.P. rating and full load speed, following motor has poor starting torque
6. The value of dielectric constant for vacuum is taken as
7. Which of the following is the poorest conductor of electricity ?
8. Direct conversion of heat into electric power is possible through