BJT at Low Frequencies - Electronic Engineering (MCQ) questions & answers

1)   Which among the below stated notations of h-parameters is used to represent the short-circuit forward current transfer ratio?

a. h11
b. h12
c. h21
d. h22
Answer  Explanation 

ANSWER: h21

Explanation:
No explanation is available for this question!
2)   Which type of amplifiers exhibit the current gain approximately equal to unity without any current amplification?

a. CE
b. CB
c. CC
d. None of the above
Answer  Explanation 

ANSWER: CB

Explanation:
No explanation is available for this question!
3)   Why is the Darlington configuration not suitable for more than two transistors?

a. Because leakage current increases and voltage gain decreases with multiple number of transistors
b. Because leakage current decreases and voltage gain increases with multiple number of transistors
c. Because leakage current as well as voltage gain increases with multiple number of transistors
d. Because leakage current as well as voltage gain decreases with multiple number of transistors
Answer  Explanation 

ANSWER: Because leakage current increases and voltage gain decreases with multiple number of transistors

Explanation:
No explanation is available for this question!
4)   What should be the value of resistance between collector and ground (R0) for below drawn schematic of transistor amplifier, comprising h-parameters as hie = 1.1 kΩ, hfe = 50, hre= hoe = 0 with short-circuit capacitors?

a. 5.2 k
b. 2.3 k
c. 1.1 k
d. Infinity
Answer  Explanation 

ANSWER: Infinity

Explanation:
No explanation is available for this question!
5)   Consider the assertions given below.

A. Replacement of each coupling and bypass capacitors by a short circuit
B. Replacement of transistor by its hybrid equivalent model for further analysis
C. Replacement of DC voltage sources by a short circuit

Which is the correct sequential order of steps to be carried out for analysis of a transistor amplifier circuit?

a. A, B, C
b. B, A, C
c. A, C, B
d. C, A, B
Answer  Explanation 

ANSWER: C, A, B

Explanation:
No explanation is available for this question!
6)   The parameter 'h12' is basically a ratio of input voltage to the output voltage with the input current equal to _______

a. Unity
b. Zero
c. Infinity
d. None of the above
Answer  Explanation 

ANSWER: Zero

Explanation:
No explanation is available for this question!
7)   What should be the level of input resistance to allow the occurrence of source loading in common base amplifier configuration?

a. Low
b. High
c. Moderate
d. Stable
Answer  Explanation 

ANSWER: Low

Explanation:
No explanation is available for this question!
8)   Which among the below assertions is not a salient feature/ property of CE amplifier?

a. High voltage gain
b. High current gain
c. High input resistance
d. High output resistance
Answer  Explanation 

ANSWER: High output resistance

Explanation:
No explanation is available for this question!
9)   What is the phase-shift between input and output voltages of CE amplifier?

a. 90°
b. 120°
c. 180°
d. 270°
Answer  Explanation 

ANSWER: 180°

Explanation:
No explanation is available for this question!
10)   Which capacitor is used to block DC portion by allowing to pass only AC portion of the amplified signal to load?

a. Input Coupling Capacitor
b. Bypass Capacitor
c. Output Coupling Capacitor
d. All of the above
Answer  Explanation 

ANSWER: Output Coupling Capacitor

Explanation:
No explanation is available for this question!

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