Physics Test - ...

A transistor is used as an amplifier in CB mode with a load resistance of 5 kW. The current gain of the amplifier is 0.98 and the input resistance is 70 W. The voltage gain and power gain respectively, are

The graph of input characteristics of common emitter amplifier is

In a transistor circuit, the collector current is 50 mA and the base current is 1 mA. The current gain α is

For a transistor, the current amplification factor is 0.8. If the transistor is in common emitter configuration and the base current changes by 6 mA, the change in the collector current is

Which of the following is used for making the filaments of electric bulbs?

The thermo-emf of a thermocouple varies with the temperature θ of the hot junction as E = aθ + bθ² in volts ,where the ratio a/b is 700°C. If the cold junction is kept at 0°C, what is the neutral temperature?

Three identical bulbs connected in series dissipate a power p. If the bulbs are connected in parallel, the power dissipated will be

The resistance of bulb filament is 100W at a temperature of 100°C. If its temperature coefficient of resistance is 0.005 per °C, its resistance will become 200 W at a temperature (°C) of _____.