Q. An npn transistor has a Beta cutoff frequency fβ of 1 MHz, and a common emitter short circuit low frequency current gain β0 of 200. It unity gain frequency fT and the alpha cut off frequency fa2 respectively are

View solution

Q. If input frequency is 50 Hz, the frequency of output wave in a full wave diode rectifier circuit is

View solution

Q. A class A transformer coupled power amplifier is to deliver 10 W output. The power rating of transistor should not be less than

View solution

Q. A half wave diode rectifier uses a diode having forward resistance of 50 ohms. The load resistance is also 50 ohms. Then the voltage regulation is

View solution

Q. A Hartley oscillator is used for

View solution

Q. In Class C operation the collector current looks like

View solution

Q. An op-amp integrating circuit uses

View solution

Q. Which of the following can be used as a buffer amplifier?

View solution

Q. A second order active bandpass filter can be obtained by cascading LP second order filter having higher cut off frequency fOH with a second order HP filter having lower cut off frequency fOL provided

View solution

Q. The open loop gain of an amplifier is 50 but likely to decrease by 20% due to various factors. If negative feedback with β = 0.1 is used, the change in gain will be about

View solution

Q. A dc power supply has no load voltage of 30 V and full load voltage of 25 V at full load current of 1 A. The output resistance and voltage regulation respectively are

View solution

Q. The main advantage of CC amplifier is

View solution

Q. If a = 0.995, IE = 10 mA, ICO = 0.5 mA, then ICEO will be

View solution

Q. Assertion (A): In class C amplifier the efficiency is more than that for other classes of amplifiers

Reason (R): In class C amplifier we can get high efficiency over a wideband

View solution

Q. Heat sink results in

View solution

Q. A buffer amplifier should have

View solution

Q. In a CE amplifier, the output voltage is equal to product of

View solution

Q. A diode can have a very high forward resistance.

View solution

Q. An increase in ambient temperature means that maximum power rating of transistor

View solution

Q. Two CE stages are coupled through a capacitor. To calculate the quiescent base current of the two transistors, the capacitor is treated as

View solution