A diode valve can be used as a rectifier.
A triode valve can be used as a rectifier.
A triode valve can be used as an amplifier.
Explanation:
A diode valve and a triode valve allow current to flow only in one direction. Since a rectifier is a device that converts alternating current (bi-directional) into direct current (uni-directional), a diode valve and a triode valve can be used as rectifiers. A triode valve can control its output in proportion to the input signal. That is, it can act as an amplifier, whereas a diode valve cannot control its output in proportion to the input signal. So, it cannot be use as an amplifier.
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The distance between the extreme points on the periphery of the mirror is called:
A 10 V storage battery of negligible internal resistance is connected across a 50 Ω resistor. How much heat energy is produced in the resistor in 1 hour
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(a) 7200 J |
(b) 6200 J |
(c) 5200 J |
(d) 4200 J |
The capacity of a parallel plate capacitor with no dielectric substance but with a separation of 0.4 cm is 2 μF. The separation is reduced to half and it is filled with a dielectric substance of value 2.8. The final capacity of the capacitor is
|
(a) 11.2 μF |
(b) 15.6 μF |
(c) 19.2 μF |
(d) 22. 4 μF |
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A convex lens of focal length 12 cm is made of glass of μ = 
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(a) 6 cm |
(b) 12 cm |
(c) 24 cm |
(d) 30 cm |