Semiconductor Devices Mock Test (Physics) MHT CET 2021

In a half wave rectifier the AC input source of frequency 50Hz is used. The fundamental frequency of the output is

An n-p-n transistor conducts when

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

For a transistor , α(DC) and β(DC) are the current ratios , then the value of β(DC) -α(DC)/β(DC). α(DC) is

If α-current gain of a transistor is 0.98. What is the value of β-current gain of the transistor ?

For CE transistor amplifier, the audio signal voltage across the collector resistance of 2kΩ is 4V. If the current amplification factor of the transistor is 100 and the base resistance is 1kΩ, then the input signal voltage is

A transistor is used as a common emitter amplifier with a load resistance 2 KΩ. the input resistance is 150 Ω. Base current is changed by 20 μA which results in a change in collector current by 1.5mA. The voltage gain of the amplifier is

Which logic gates produces ‘LOW’ output when any of the inputs is ‘HIGH’ ?

How many NAND gates are needed to form an AND gate ?

For a transistor ,[ 1/α – 1/β]  is equal to

In a common base amplifier circuit , calculate the change in base current if that in the emitter current is 2mA and α= 0.98

A combination of AND function and NOT function results in

The Boolean expression for OR function is

In transistor as an amplifier if α = I(C)/I(E) and β = I(C)/I(B) then ,

In a transistor α is always