# Malvino: MCQ in Differential Amplifiers

(Last Updated On: February 7, 2020)

This is the Multiple Choice Questions in Chapter 17: Differential Amplifiers from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

### Topic Outline

• MCQs in Differential Amplifiers
• MCQs in DC Analysis of Differential Amplifiers
• MCQs in AC Analysis of Differential Amplifiers
• MCQs in Input Characteristics of an Op Amp
• MCQs in Common Mode Gain
• MCQs in Integrated Circuits
• MCQs in Current Mirror
• MCQs in Loaded Differential Amplifiers

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. Monolithic ICs are

• a. Forms of discrete circuits
• b. On a single chip
• c. Combinations of thin-film and thick-film circuits
• d. Also called hybrid ICs

2. The op amp can amplify

• a. AC signals only
• b. DC signals only
• c. Both ac and dc signals
• d. Neither ac nor dc signals

3. Components are soldered together in

• a. Discrete circuits
• b. Integrated circuits
• c. SSI
• d. Monolithic ICs

4. The tail current of a diff amp is

• a. Half of either collector current
• b. Equal to either collector current
• c. Two times either collector current
• d. Equal to the difference in base currents

5. The node voltage at the top of the tail resistor is closest to

• a. Collector supply voltage
• b. Zero
• c. Emitter supply voltage
• d. Tail current times base resistance

6. The input offset current equals the

• a. Difference between two base currents
• b. Average of two base currents
• c. Collector current divided by current gain
• d. Difference between two base-emitter voltages

7. The tail current equals the

• a. Difference between two emitter currents
• b. Sum of two emitter currents
• c. Collector current divided by current gain
• d. Collector voltage divided by collector resistance

8.The voltage gain of a diff amp with a differential output is equal to RC divided by

• a. re’
• b. re’/2
• c. 2re’
• d. RE

9. The input impedance of a differential amplifier equals re’ times

• a. 0
• b. RC
• c. RE
• d. 2 times Beta

10. A dc signal has a frequency of

• a. 0
• b. 60 Hz
• c. 0 to over 1 MHz
• d. 1 MHz

11. When the two input terminals of a diff amp are grounded,

• a. The base currents are equal
• b. The collector currents are equal
• c. An output error voltage usually exists
• d. The ac output voltage is zero

12. One source of output error voltage is

• a. Input bias current
• b. Difference in collector resistors
• c. Tail current
• d. Common-mode voltage gain

13. A common-mode signal is applied to

• a. The non-inverting input
• b. The inverting input
• c. Both inputs
• d. Top of the tail resistor

14. The common-mode voltage gain is

• a. Smaller than voltage gain
• b. Equal to voltage gain
• c. Greater than voltage gain
• d. None of the above

15. The input stage of an op amp is usually a

• a. Differential amplifier
• b. Class B push-pull amplifier
• c. CE amplifier
• d. Swamped amplifier

16. The tail of a diff amp acts like a

• a. Battery
• b. Current source
• c. Transistor
• d. Diode

17. The common-mode voltage gain of a diff amp is equal to RC divided by

• a. re’
• b. re’/2
• c. 2re’
• d. 2RE

18. When the two bases are grounded in a diff amp, the voltage across each emitter diode is

• a. Zero
• b. 0.7 V
• c. The same
• d. High

19. The common-mode rejection ratio is

• a. Very low
• b. Often expressed in decibels
• c. Equal to the voltage gain
• d. Equal to the common-mode voltage gain

20. The typical input stage of an op amp has a

• a. Single-ended input and single-ended output
• b. Single-ended input and differential output
• c. Differential input and single-ended output
• d. Differential input and differential output

21. The input offset current is usually

• a. Less than the input bias current
• b. Equal to zero
• c. Less than the input offset voltage
• d. Unimportant when a base resistor is used

22. With both bases grounded, the only offset that produces an error is the

• a. Input offset current
• b. Input bias current
• c. Input offset voltage
• d. Beta

### Complete List of MCQ in Electronic Principles by Albert Malvino

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1. Assistant Director Vehari