Bipolar Junction Transistor MCQ Level -1 - Physics MCQ

This transistor configuration provides a low input impedance while offering a high output impedance. Although the voltage is high, the current gain is low and the overall power gain is also low 

The direction of current is always from p to n.
The correct answer is:

For an npn common base amplifier, emitter is always forward biased and collector is reverse biased.
The correct answer is: Emitter is forward biased and collector is reverse biased

The difference of frequencies when amplitude becomes 70% of maximum is called as bandwidth.
Hence, bandwidth = 
The correct answer is:

The cascaded amplifier, where an RC network is used for inter stage coupling is known as RC coupled amplifier. The main function of capacitor in RC coupling in common emitter amplifier is to isolate the dc .
The correct answer is: dc isolation

Since C and C_m are parallel, the equivalent capacitance is given as:
C_eq=c + cm
Now,


The correct answer is: 

In common emitter mode, l_E = l_B + l_C
The input characteristics of the transistor represents the variation of base current l_B with base emitter voltage V_BE keeping V_CE fixed.
The correct answer is: l_B versus V_BE at Constant V_CE

Sharpness is the measurement of the stability. Sharpness increases means durability increases, since sharpness is directly proportional to quality factor Q. Hence, a crystal oscillator provides stable frequency because of high Q of the crystal.
The correct answer is: high Q of the crystal

The correct answer is: