MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions

In switching circuit, transistor is in ON state, values of I_E and l_B are 10 mA and 0.8 mA respectively and R_L is 2 k`Omega`. If V_CE is 7.6 V, then V_CC is ____________.

Which of the following regions of a transistors are, respectively, heavily dopped and lightly dopped?

In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be: ____________.

If the radius of the circular path and frequency of revolution of a particle of mass m are doubled, then the change in its kinetic energy will be (E_i and E_f are the initial and final kinetic energies of the particle respectively.)

In case of npn transistors, the collector current is always less than the emitter current because ______.

The depletion layer in the p-n junction diode is caused by ______.

A particle of charge q, mass m and energy E has de-Broglie wavelength `lambda.` For a particle of charge 2q, mass 2m and energy 2E, the de-Broglie wavelength is ____________.

Polarised dielectric is equivalent to ______.

In an npn transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector, the emitter current (I_E) and base current (I_B) are given by ____________.

How much energy is imparted to an electron so that its de-Broglie wavelength reduces from 10^-10 m to 0.5 × 10^-10 m? (E =energy of electron)

L-C-R series circuit contains a resistance of 10 Ω and self-inductance 0.4 H connected in series with variable capacitor across 60 V and 50 Hz supply. The value of capacity at resonance will be π² = 10.

For a common emitter configuration, if 'α' and 'β' have their usual meanings, the correct relationship between 'α' and 'β' is ______.

In a silicon transistor, a change of 7.89 mA in the emitter current if produces a change of 7.8 mA in the collector current, then the base current must change by ____________.

In a transistor, a change of 8.0 mA in the emitter current produces a change of 7.8 mA in the collector current. Then change in the base current is ____________.

A transistor when connected in common emitter mode has a ____________.

A pnp transistor is used in common-emitter mode. If a change of 40 µA in base current brings a change of 2 µA in collector current with 0.04 V in base-emitter voltage, then the input resistance is ____________.

The current gain `alpha` of a transistor is 0.95. The change in collector current corresponding to a change of 0.4 mA in the base current in a common emitter arrangement is ______.

In a semiconductor diode, the barrier potential offers opposition to only ______.

To hear an echo, the total distance covered by sound from the point of generation to the reflecting surface and back should be atleast ____________.

In a transistor, the thickness of the base region ____________.