# Analog Circuits [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 172 - 175 of 249

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## Question 172

Analog Circuits
Simple Op-Amp Circuits

Appeared in Year: 2013 (UGC-NET)

### Question

MCQ▾

An ideal op-amp has

### Choices

Choice (4)Response

a.

Infinite common mode gain and zero differential gain.

b.

Zero differential gain and infinite common mode gain.

c.

Infinite common mode gain as well as differential gain.

d.

Infinite differential gain and zero common mode gain.

## Question 173

Analog Circuits
Simple Op-Amp Circuits

Appeared in Year: 2013 (UGC-NET)

### Question

Assertion-Reason▾

### Assertion(Ꭺ)

In an Op-Amp circuit when one input terminal of the Op-Amp is grounded, the other terminal becomes a virtual ground.

### Reason(Ꭱ)

Input impedance of the Op-Amp is high.

### Choices

Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

### Passage

Multiplexing is the sending of separate signals together, over the same cable or bearer simultaneously without interference. Time division multiplex is a method of interleaving in the time domain pulses belonging to different transmissions. These pulses are generally narrow and separation between successive pulses is rather wide. That being the case it is possible, provided the two ends of a link are synchronized, to use the wide spaces for pulses belonging to other transmissions. Frequency division multiplexing concerns itself with combining continuous signals. It may be thought of as an outgrowth of independent side band transmission on a much enlarged scale. As will see 12 or 16 channels are combined into a group, 5 groups into a subgroup. Each group and subgroup is then sent as a whole unit one microwave link cable or other broadband system. Continental broadband systems are then treated followed by coaxial cables, fibre optic cable, microwave links and trope scatter systems.

## Question 174 (1 of 3 Based on Passage)

Analog Circuits
Criterion for Oscillation, Single-Transistor and Opamp Configurations

Appeared in Year: 2013 (UGC-NET)

### Question

MCQ▾

The number of repeaters along a co-axial cable link depends on

### Choices

Choice (4)Response

a.

The bandwidth of the system.

b.

The number of co-axial cables in the tube.

c.

The separation of equalizers.

d.

Whether separate tubes are used for the two directions of transmission.

## Question 175 (2 of 3 Based on Passage)

Analog Circuits
Criterion for Oscillation, Single-Transistor and Opamp Configurations

Appeared in Year: 2013 (UGC-NET)

### Question

MCQ▾

Microwave link repeaters are typically 50 km apart

### Choices

Choice (4)Response

a.

Because of earths curvature

b.

Because of output tube power limitations

c.

To ensure that the applied dc voltage is not excessive

d.

Because of atmospheric attenuation

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