Q. In a class C operation VCC = 40 V, RL = 50 Ω. The maximum load power can be

View solution

Q. IF VCC = 15 V, VCEQ = 5 V and ICQ = 50 mA, the efficiency in class A operation is

View solution

Q. A bridge rectifier circuit has a dc load current of 10 mA and a filter capacitance of 1000 μF. The peak to peak ripple voltage is

View solution

Q. Which of the following best represents the bandwidth of an actual op-amp?

View solution

Q. Class C amplifier is suitable for

View solution

Q. In a N-P-N transistor, when emitter junction is forward biased and collector junction is reverse biased the transistor will operate in

View solution

Q. A Wien bridge is suitable for

View solution

Q. Which op-amp circuit uses a capacitor in series with input and resistance in feedback path?

View solution

Q. For class B operation the theoretical maximum efficiency is

View solution

Q. Typical values of current gains for CE, CB and CC amplifiers are

View solution

Q. To draw ac equivalent circuit for a CE amplifier we should

View solution

Q. The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The noise factor is

View solution

Q. Assertion (A): The gain of an FET amplifier can be changed by changing gm

Reason (R): Most receivers use automatic gain control to counteract changes in volume caused by fading

View solution

Q. The element in the feedback circuit of a logarithmic amplifier using op-amp is

View solution

Q. In a FET, gm varies as

View solution

Q. Assertion (A): Class A and Class B amplifier predominate in audio applications.

Reason (R): Class C amplifier is used at radio frequencies.

View solution

Q. For an ideal noise free transistor amplifier the noise factor is

View solution

Q. In a crystal

View solution

Q. Ultra high frequency oscillators work in the range

View solution

Q. N-channel FETs are superior to p-channel FETs because

View solution