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Test: Large Signal Amplifiers - Electronics and Communication Engineering (ECE) MCQ


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10 Questions MCQ Test - Test: Large Signal Amplifiers

Test: Large Signal Amplifiers for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Test: Large Signal Amplifiers questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Large Signal Amplifiers MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Large Signal Amplifiers below.
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Test: Large Signal Amplifiers - Question 1

Assertion (A): The harmonic distortion of an amplifier increases at higher power levels,
Reason (R): For high quality audio amplifiers, the maximum THD is 0.7% at the desired listening level.

Test: Large Signal Amplifiers - Question 2

A common-emitter amplifier, with a self-bias circuit to bias the transistor in the active mode, -is an example of a class ____ amplifier.

Detailed Solution for Test: Large Signal Amplifiers - Question 2

The O-point of class-A amplifier is located in active region i.e. at the mid-point of dc load line as shown below.

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Test: Large Signal Amplifiers - Question 3

The advantages of class B as compared with class A operation are
1. efficiency is higher.
2. possible to obtain greater power output.
3. less distortion and noise interference.
4. negligible power loss at no input signal. Of these the statements:

Detailed Solution for Test: Large Signal Amplifiers - Question 3

Compared to class A operation, class B operation has

  • higher efficiency (r| = 78.5%)
  • greater output power 
  • more distortion and noise interference.
  • negligible power loss at no input signal i.e. no power drain since transistor in class B operation will not consume any power if signal is not applied.

Hence, statements 1,2 and 4 are correct.

Test: Large Signal Amplifiers - Question 4

Assertion (A): In a system where the power supply is limited, such as those operating from solar cells or a battery, the output power is usually delivered through a push-pull class B transistor circuit.

Reason (R): It is possible to obtain greater power output, higher efficiency and negligible power loss at no signal with the help of a push- pull class B transistor circuit.

Test: Large Signal Amplifiers - Question 5

For a given transistor, the thermal resistance is 8 °C/W and the ambient temperature TA is 27°C. if the transistor dissipates 3 W of power, the junction temperature Tj will be

Detailed Solution for Test: Large Signal Amplifiers - Question 5

We know that,

or

Test: Large Signal Amplifiers - Question 6

Crossover distortion occurs in ______ Amplifiers.

Detailed Solution for Test: Large Signal Amplifiers - Question 6

Concept:

  1. Crossover distortion is the term given to a type of distortion that occurs in push-pull class AB or class B amplifiers. 
  2. It happens during the time when one side of the output stage shuts off, and the other turns on.
  3. If there is a difference in timing of on and off of two stages of the transistor, cross-over distortion occurs.
  4. The cross-over distortion in the class B power amplifier is eliminated by the Class AB power amplifier which uses diodes at the bases of transistors to reduce forward bias voltage at bases i.e. by biasing the transistors slightly above the cut-off.
Test: Large Signal Amplifiers - Question 7

For a class B amplifier, using a supply voltage of VCC = 30 V and driving a load of 12 Ω, calculate the transistor dissipation.

Detailed Solution for Test: Large Signal Amplifiers - Question 7

Test: Large Signal Amplifiers - Question 8

The maximum theoretical efficiency of a class A amplifier can be

Detailed Solution for Test: Large Signal Amplifiers - Question 8

The maximum theoretical efficiency of a class A amplifier is 50%. 

Test: Large Signal Amplifiers - Question 9

For a transistor, Tj = 160°C, TA = 40°C and θJ-A = 80°C/W. What is the power that the transistor can safely dissipate in free air?

Detailed Solution for Test: Large Signal Amplifiers - Question 9

The power dissipated by the transistor is

Test: Large Signal Amplifiers - Question 10

ln a class A amplifier, VCE(max) = 15 VCE(min) = 1 V. The overall efficiency for series fed load and transformer coupled load are respectively

Detailed Solution for Test: Large Signal Amplifiers - Question 10

For series-fed load, overall efficiency,

For transformer-coupled load, overall efficiency,

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