Study mode · no timer

Transistor Biasing

Study 40 Electrical Engineering MCQs with correct answers and explanations.

Answers and explanations are always visible Take this test

31Electrical EngineeringMedium

A silicon transistor is biased with base resistor method. If ß=100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V, what is the value of the base resistor RB?

A105 kO

BNone of the above

C530 kO

D315 kO

Correct answer

C. 530 kO

Explanation

The correct answer is 530 kO.

32Electrical EngineeringMedium

In voltage divider bias, VCC = 25 V; R1 = 10 kO; R2 = 2.2 V ; RC = 3.6 V and RE =1 kO. What is the emitter voltage?

A7 V

B8 V

C3 V

Correct answer

B. 8 V

Explanation

The correct answer is 8 V.

33Electrical EngineeringMedium

The base resistor method is generally used in ________?

ASwitching circuits

BNone of the above

CAmplifier circuits

DRectifier circuits

Correct answer

A. Switching circuits

Explanation

The correct answer is Switching circuits.

34Electrical EngineeringMedium

The zero signal IC is generally ________ mA in the initial stages of a transistor amplifier?

AMore than 10

Correct answer

C. 1

Explanation

The correct answer is 1.

35Electrical EngineeringMedium

The operating point is also called the ________?

ASaturation point

BQuiescent point

CNone of the above

DCut off point

Correct answer

B. Quiescent point

Explanation

The correct answer is Quiescent point.

36Electrical EngineeringMedium

An ideal value of stability factor is________?

AMore than 200

B200

D100

Correct answer

B. 200

Explanation

The correct answer is 200.

37Electrical EngineeringMedium

The disadvantage of base resistor method of transistor biasing is that it________?

AProvides high stability

BIs sensitive to changes in ß

CIs complicated

DNone of the above

Correct answer

B. Is sensitive to changes in ß

Explanation

The correct answer is Is sensitive to changes in ß.

38Electrical EngineeringMedium

The stabilisation of operating point in potential divider method is provided by________?

ARC consideration

BVCC consideration

CRE consideration

DNone of the above

Correct answer

C. RE consideration

Explanation

The correct answer is RE consideration.

39Electrical EngineeringMedium

In a particular biasing circuit, the value of RE is about ________?

A1 MO

B800 O

C10 kO

D100 kO

Correct answer

B. 800 O

Explanation

The correct answer is 800 O.

40Electrical EngineeringMedium

If biasing is not done in an amplifier circuit, it results in________?

ADecrease in the base current

BUnfaithful amplification

CNone of the above

DExcessive collector bias

Correct answer

B. Unfaithful amplification

Explanation

The correct answer is Unfaithful amplification.

31Electrical EngineeringMedium

A silicon transistor is biased with base resistor method. If ß=100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V, what is the value of the base resistor RB?

A105 kO

BNone of the above

C530 kO

D315 kO

Correct answer

C. 530 kO

Explanation

The correct answer is 530 kO.

32Electrical EngineeringMedium

In voltage divider bias, VCC = 25 V; R1 = 10 kO; R2 = 2.2 V ; RC = 3.6 V and RE =1 kO. What is the emitter voltage?

A7 V

B8 V

C3 V

Correct answer

B. 8 V

Explanation

The correct answer is 8 V.

33Electrical EngineeringMedium

The base resistor method is generally used in ________?

ASwitching circuits

BNone of the above

CAmplifier circuits

DRectifier circuits

Correct answer

A. Switching circuits

Explanation

The correct answer is Switching circuits.

34Electrical EngineeringMedium

The zero signal IC is generally ________ mA in the initial stages of a transistor amplifier?

AMore than 10

Correct answer

C. 1

Explanation

The correct answer is 1.

35Electrical EngineeringMedium

The operating point is also called the ________?

ASaturation point

BQuiescent point

CNone of the above

DCut off point

Correct answer

B. Quiescent point

Explanation

The correct answer is Quiescent point.

36Electrical EngineeringMedium

An ideal value of stability factor is________?

AMore than 200

B200

D100

Correct answer

B. 200

Explanation

The correct answer is 200.

37Electrical EngineeringMedium

The disadvantage of base resistor method of transistor biasing is that it________?

AProvides high stability

BIs sensitive to changes in ß

CIs complicated

DNone of the above

Correct answer

B. Is sensitive to changes in ß

Explanation

The correct answer is Is sensitive to changes in ß.

38Electrical EngineeringMedium

The stabilisation of operating point in potential divider method is provided by________?

ARC consideration

BVCC consideration

CRE consideration

DNone of the above

Correct answer

C. RE consideration

Explanation

The correct answer is RE consideration.

39Electrical EngineeringMedium

In a particular biasing circuit, the value of RE is about ________?

A1 MO

B800 O

C10 kO

D100 kO

Correct answer

B. 800 O

Explanation

The correct answer is 800 O.

40Electrical EngineeringMedium

If biasing is not done in an amplifier circuit, it results in________?

ADecrease in the base current

BUnfaithful amplification

CNone of the above

DExcessive collector bias

Correct answer

B. Unfaithful amplification

Explanation

The correct answer is Unfaithful amplification.