The resistivity of a metal is a function of temperature because
A). The amplitude of vibration of the atoms varies with temperature
B). The electron density varies with temperature
C). The electron gas density varies with temperature
D). None of the above
The amplitude of vibration of the atoms varies with temperature
1. The back e.m.f. in the stator of a synchronous motor depends on
3. The capacitor voltage always leads the current by 90°.
4. Which of the following losses, in a synchronous motor, does not vary with load?
5. Which of the following insulation is used in cables?
6. Which of the following is the passive element?
7. Which of the following is a valid integer constant?
8. The major advantage of FM over AM is ___________
9. In an automatic control system which of the following elements is not used ?