Monolithic Phase-Locked Loop MCQ [Free PDF] - Objective Question Answer for Monolithic Phase-Locked Loop Quiz

11. Burr-Brown 3553 power amplifier is suited for

A. Line driving applications
B. Power supply requirement
C. Bandwidth adjustments
D. High-frequency application

Answer: A

Burr-Brown 3553 power amplifier is suited for line driving applications in which fast pulses or wideband signals are involved.

12. Find the IC that can be used for short circuit proof protection?

A. All of the mentioned
B. IC LM384
C. ICL8063
D. ICLM380

Answer: C

The Intersil ICL8063 monolithic power transistor driver and amplifier has built-in safe area protection and short-circuits proof protection.

13. Which of the following is ideal for consumer applications?

A. NE5018
B. LM380
C. MC1408
D. SE5018

Answer: B

LM380 is a power audio amplifier designed to deliver a minimum of 2.5w to an 8Ω load and hence is ideal for consumer applications.

14. Bridge power audio amplifier can deliver power up to

A. Twice as much as the output of a single LM380 amplifier
B. Thrice as much as the output of a single LM380 amplifier
C. Four times as much as the output of a single LM380 amplifier
D. Half of the output of a single LM380 amplifier

Answer: C

Two LM380s are used in the bridge configuration. Therefore, it produces a maximum output voltage swing that is equal to twice that of a single LM380 amplifier.

15. What precautionary measures should be taken if the circuit is used in an RF-sensitive environment?

A. Connect a parallel combination of RC at the output
B. Connect a series combination of Resistors at the output
C. Connect parallel capacitor at the output
D. Connect a series combination of RC at the output

Answer: D

When the LM380 audio power amplifier is used in an RF-sensitive environment, an RC combination should be added at the output terminal (Pin 8) to eliminate 5 to 10-MHz oscillation.

16. Which amplifier provides twice the output swing as that of the LM380 amplifier?

A. Hybrid power amplifier
B. Bridge power audio amplifier
C. Monolithic power audio amplifier
D. Dual power amplifier

Answer: B

In the bridge power audio amplifier, two LM380s are used in a bridge configuration. Therefore, the maximum output voltage swing will be twice that of a single LM380 amplifier.

17. A LM380 power amplifier is used in an intercom system with amplifier gain = 50 and the transformer turns ratio is given as 35. Find the overall gain of the circuit.

A. 1880
B. 1750
C. 1370
D. 1580

Answer: B

Given, N₁/N₂=35; Gain of amplifier = 50.

Therefore, the overall gain of the circuit = 50×35 =1750.

18. Determine the work done by the intercom system depending on the position of the switch

A. Remote speaker acts as a microphone
B. Master speaker acts as a microphone
C. Remote and master speaker act as a microphone
D. None of the mentioned

Answer: A

When the switch of the intercom system is in the listen mode, the remote speaker acts as the microphone.

19. Free running multivibrator is also called as

A. Stable multivibrator
B. Voltage control oscillator
C. Square wave oscillator
D. Pulse stretcher

Answer: B

Free-running multivibrator operates at a frequency that is determined by an external tuning capacitor and a resistor. On applying a dc control voltage the frequency can be shifted on either side. This frequency deviation is directly proportional to the dc control voltage and hence it is called as ‘voltage controlled oscillator’.

20. The output voltage of the phase detector is

A. Phase voltage
B. Free running voltage
C. Error voltage
D. None of the mentioned

Answer: C

The phase detector compares the input frequency with the feedback frequency and produces output dc voltage called error voltage.

21. At which state the phase-locked loop tracks any change in input frequency?

A. Free running state
B. Capture state
C. Phase-locked state
D. All of the mentioned

Answer: C

In the phase-locked, the output frequency is the same as the input signal frequency. So the circuit tracks any change in the input frequency through its repetitive action.

22. What is the function of a low pass filter in a phase-locked loop?

A. Improves low-frequency noise
B. Removes high-frequency noise
C. Tracks the voltage changes
D. Changes the input frequency

Answer: B

The output voltage of a phase detector is a dc voltage and is often referred to as error voltage. This output is applied to the low pass filter which removes the high-frequency noise and produces a dc level.

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