NTA-NET (Based on NTA-UGC) Electronic Science (Paper-II): Questions 79 - 81 of 124

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Question number: 79

» Power Devices » Speed Control of a.c. And d.c. Motors

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Appeared in Year: 2018

Assertion-Reason▾

Question

Assertion (Ꭺ)

The synchronous speed of an induction motor can be varied by varying the frequency of the applied voltage. (July)

Reason (Ꭱ)

With smaller frequency of operation, there is a large value of slip and motor rotates non-linearity with the frequency ‘f’ of applied voltage.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

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

Question number: 80

» Networks and Theorems » Network Elements

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Appeared in Year: 2018

MCQ▾

Question

Consider the following network:

Image of The network

Image of the Network

Image of The network

1) Power dissipated in resistor is

2) Power dissipated in resistor is

3) Power dissipated in resistor is

Arrange the above increasing order of the dissipated power: (July)

Choices

Choice (4) Response

a.

2), 3), 1)

b.

3), 1), 2)

c.

1), 2), 3)

d.

1), 3), 2)

Question number: 81

» Digital Electronics » Logic Families

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Appeared in Year: 2018

Assertion-Reason▾

Question

Assertion (Ꭺ)

Emitter-Coupled logic (ECL) is the fastest of all logic families and used in application where very high speed is essential. (July)

Reason (Ꭱ)

High speed ECL is because the transistors are used in difference amplifier configuration in which they are never driven into saturation and the storage time is eliminated.

Choices

Choice (4) Response

a.

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

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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