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Bipolar Junction Transistor NAT Level -2 - Physics MCQ


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10 Questions MCQ Test Topic wise Tests for IIT JAM Physics - Bipolar Junction Transistor NAT Level -2

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*Answer can only contain numeric values
Bipolar Junction Transistor NAT Level -2 - Question 1

Calculate the voltage VC of the circuit shown in the given figure:


Detailed Solution for Bipolar Junction Transistor NAT Level -2 - Question 1


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Bipolar Junction Transistor NAT Level -2 - Question 2

Calculate the minimum value of C2 (in μF) if the amplifier operate over a frequency range of 2kHz to 10kHz?


Detailed Solution for Bipolar Junction Transistor NAT Level -2 - Question 2

RE = 560Ω
XC of the bypass capacitor C2 should be

The capacitive value, at the minimum frequency of 2kHz

The correct answer is: 1.42

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*Answer can only contain numeric values
Bipolar Junction Transistor NAT Level -2 - Question 3

If the Q-point is 2 Vand 1 mA with the help of a feedback resistor RB. β = 100, then what is the value of RB in? (Take VBE = 0.7V).


Detailed Solution for Bipolar Junction Transistor NAT Level -2 - Question 3



The correct answer is: 130

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Bipolar Junction Transistor NAT Level -2 - Question 4

Calculate the value of VCE (in Volts) for the circuit shown below. (β = 100 and VBE =0.7V).


Detailed Solution for Bipolar Junction Transistor NAT Level -2 - Question 4

Let us use Thevenin’s theorem


Now, applying KVL to Base circuit

= 9.45 μA
lC = 0.945mA
Now, Vcc = IcRc
- VCE


The correct answer is: 6.22

*Answer can only contain numeric values
Bipolar Junction Transistor NAT Level -2 - Question 5

A npn transistor circuit has  ∝ = 0.985. If IC = 2mA then the value of lB (in mA) is?


Detailed Solution for Bipolar Junction Transistor NAT Level -2 - Question 5


= 0.03 mA
The correct answer is: 0.03

*Answer can only contain numeric values
Bipolar Junction Transistor NAT Level -2 - Question 6

For the circuit shown below, the value of IC is: 


Detailed Solution for Bipolar Junction Transistor NAT Level -2 - Question 6

Concept:
DC Analysis of BJT Amplifier
During the calculation of the DC parameter of a BJT amplifier, the capacitor is open-circuited.

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Bipolar Junction Transistor NAT Level -2 - Question 7

In the circuit shown in figure below, minimum value of β such that transistor in saturation is


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Bipolar Junction Transistor NAT Level -2 - Question 8

In a certain oscillator, Av = 50. The attenuation of the feedback circuit must be?


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Bipolar Junction Transistor NAT Level -2 - Question 9

An amplifier of gain 1000 is made into a feedback amplifier by feeding 9.9% of its output voltage in series with the input opposing. If fl = 20Hz and fh = 200kHz for the amplifier without feedback then due to the feedback what is the new frequency (in kHz)?


Detailed Solution for Bipolar Junction Transistor NAT Level -2 - Question 9


The correct answer is: 20000

*Answer can only contain numeric values
Bipolar Junction Transistor NAT Level -2 - Question 10

VCE  approximately equals ________ when a transistor switch is in saturation.


Detailed Solution for Bipolar Junction Transistor NAT Level -2 - Question 10

"Saturation" in a transistor switch circuit is achieved when the voltage across the collector/ emitter (VCE(sat)) is less than or equal to . 1 to . 3 volts - depending on the type of transistor. At that voltage point, the transistor appears to act like a simple SPST mechanical switch that has been closed (On).

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