# Linear Integrated Circuits Mcqs

Q:

A LM380 power amplifier is used in a 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

Explanation: Given, N1/N2=35; Gain of amplifier = 50.Therefore, the overall gain of the circuit = 50×35 =1750.

38
Q:

Which amplifier provides twice output swing as that of LM380 amplifier?

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

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

51
Q:

Bridge power audio amplifier can deliver power upto

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

Answer & Explanation Answer: C) Four times as much as output of single LM380 amplifier

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

66
Q:

Which among the following is ideal for consumer applications?

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

Explanation: 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.

56
Q:

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

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

Explanation: The intersil ICL8063 monolithic power transistor driver and amplifier has a built-in safe area protection and short-circuit proof protection.

44
Q:

Burr-Brown 3553 power amplifier is suited for

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

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

59
Q:

What is the power dissipation of power transistor?

 A) ≅ 0.5W B) ≤ 0.5W C) > 0.5W D) ≠ 0.5W

Explanation: Transistors with power dissipation larger than 1/2 (0.5)W are called power transistors.

39
Q:

Which type of power transistor is chosen for a discrete power booster?

 A) Collector follower stage B) Emitter follower stage C) Base follower stage D) None of the mentioned