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
 
Answer & Explanation Answer: B) 1750

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

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14
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
 
Answer & Explanation Answer: B) Bridge power audio 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.

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17
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.

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14
Q:

Which among the following is ideal for consumer applications?

A) NE5018 B) LM380
C) MC1408 D) SE5018
 
Answer & Explanation Answer: B) LM380

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.

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12
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
 
Answer & Explanation Answer: C) ICL8063

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

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13
Q:

Burr-Brown 3553 power amplifier is suited for

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

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

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13
Q:

What is the power dissipation of power transistor?

A) ≅ 0.5W B) ≤ 0.5W
C) > 0.5W D) ≠ 0.5W
 
Answer & Explanation Answer: C) > 0.5W

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

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14
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
 
Answer & Explanation Answer: B) Emitter follower stage

Explanation: A discrete power booster is formed by an emitter follower stage using a power transistor. Because of unity gain, the emitter follower helps to retain the voltage gain characteristics of the general purpose op-amp.

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