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Test: Transistor Biasing & Thermal Stabilization


10 Questions MCQ Test Topicwise Question Bank for Electrical Engineering | Test: Transistor Biasing & Thermal Stabilization


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Attempt Test: Transistor Biasing & Thermal Stabilization | 10 questions in 30 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Topicwise Question Bank for Electrical Engineering for Electrical Engineering (EE) Exam | Download free PDF with solutions
QUESTION: 1

If a change in base current does not change the collector current, the transistor amplifier is said to be

Solution:
QUESTION: 2

In a BJT, if the collector junction is reverse biased and the emitter junction is reverse - biased, it is said to operate in

Solution:

QUESTION: 3

On applying a positive voltage signal to the' base of a normally biased n-p-n CE transistor amplifier

Solution:
QUESTION: 4

Assertion (A): The process of giving proper supply voltages and resistances for obtaining the desired Q-point is called biasing.
Reason (R): In order to produce distortion free output in amplifier circuits, the supply voltages and resistances in the circuit must be suitably chosen.
Solution:
QUESTION: 5

Match List-I (Transistor parameters) with List-ll (Temperature effect) and select the correct answer using the codes given below the lists:
List-I
A. Base-emitter voltage (VBE)
B. Transistor current gain (β)
C. Reverse saturation current (Ico)

List-ll
1. Independent of temperature
2. Decreases by 2.5 mV per oC
3. Increases with temperature
4. Increase by 7% per oC
Solution:
QUESTION: 6

For the transistor circuit shown below, the Q-point values are given as ICQ = 1 mA and VCEQ = 6V 

If VBE (on) = 0.7 V, the values of the RB and Rc will be respectively
Solution:

The collector resistance is:

Base current is,

QUESTION: 7

For the transistor circuit shown below,β = 100 and VBE(on) = 0.7 V.

The transistor is working under
Solution:

Let the transistor be operating under active region.
Applying KVL, we have:

QUESTION: 8

In a collector-to-base CE amplifier circuit having Vcc = 12 V, Rc = 250 Ω , IB = 0.25 mA, β = 100 and VCEQ = 8 V, the stability factor will be approximately given by (neglect VBE)
Solution:

For a coliector-to-base CE amplifier, stability factor is given by

QUESTION: 9

A self-bias circuit (with an emitter resiistor) stabilizes the__________  of the circuit against variations in temperature and process parameters.
Solution:

A self-bias circuit is used to establish a stable operating point in the self-biasing configuration. If Ic tends to increase, say, because Ico has risen as a result of an elevated temperature, the current in Re increases. As a consequence of the increase in voltage drop across Re, the base current is decreased. Hence, Ic will increase less than it would have been no self-biasing resistor Re.

QUESTION: 10

In typical circuits, the stabilization factor S = (ΔICICO) is
Solution:

For better stability of the circuit, stability factor S must be as small as possible.

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