Q. Assertion (A): Alkali metals are used as emitters in phototubes.

Reason (R): Alkali metals have low work functions.

View solution

Q. A JFET operates in ohmic region when

View solution

Q. In CE connection, the leakage current of a transistor is about

View solution

Q. The early effect in a BJT is caused by

View solution

Q. In a common emitter BJT amplifier, the maximum usable supply voltage is limited by

View solution

Q. Assertion (A): In active region of CE output characteristics of BJT, collector current is nearly constant.

Reason (R): Base current in CE connection is very small.

View solution

Q. The temperature of cathode is increased from 2500K to 2600K. The increase in thermionic emission current is about

View solution

Q. Consider the following statement:

At finite temperature, magnetic dipoles in a material are randomly oriented giving low magnetization. When magnetic field H is applied, the magnetization?

1. Increases with H
2. Decreases with H
3. Decreases with temp for constant H

Which of the statement given above is/are correct?

View solution

Q. Ferrites have

View solution

Q. Eg is the band gap, A is pre-factor, k is Boltzmann constant? Which one of the following is the remaining grade of paper used in paper capacitor, besides the other two grade of paper-low and extra low loss?

View solution

Q. Barkhausen criterion of oscillation is

View solution

Q. In a p-n-p transistor the main current carriers and the mechanism of flow respectively are

View solution

Q. Secondary emission occurs in

View solution

Q. In common base connection, the output characteristics of a bipolar junction transistor is drawn between

View solution

Q. In fabricating silicon BJT in ICs by the epitaxial process, the number of diffusions used is usually

View solution

Q. For generating 1 MHz frequency signal, the most suitable circuit is

View solution

Q. A doped semi-conductor is called

View solution

Q. In n type MOSFET, the substrate

View solution

Q. The first and the last critical frequency of an RC driving point impedance function must respectively by

View solution

Q. The diffusion current is proportional to

View solution