GATE (Graduate Aptitude Test in Engineering) Electronics: Questions 844 - 847 of 1076

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Question 844

Appeared in Year: 2017

Question

MCQ▾

Consider a single input single output discrete-time system with as input and y [n] as output, where the two are related as

Which one of the following statement is true about the system?

Choices

Choice (4)Response

a.

It is causal but not stable

b.

It is not causal but stable

c.

It is neither causal nor stable

d.

It is causal and stable

Question 845

Appeared in Year: 2017

Question

Numeric Answer▾

In the figure shown, the transistor acts as a switch.

The Npn Transistor Acts as a Switch

For the input as shown in the figure, the transistor switches between the cut-off and saturation regions of operation, when T is large. Assume collector-to-emitter voltage at saturation and base-to-emitter voltage . The minimum value of the common-base current gain of the transistor for the switching should be …

Question 846

Arithmetic Circuits, Code Converters, Multiplexers, Decoders and PLAs

Appeared in Year: 2016

Question

MCQ▾

The functionality implemented by the circuit below is

The Functionality Implemented by the Circuit

Choices

Choice (4)Response

a.

b.

c.

d.

Question 847

Diffusion Current, Drift Current, Mobility and Resistivity

Appeared in Year: 2015

Question

Numeric Answer▾

A dc voltage of 10 V is applied across an n-type silicon bar having a rectangular cross-section and a length of 1 cm as shown in figure. The donor doping concentration and the mobility of electrons are and , respectively. The average time (in ) taken by the electrons to move from one end of the bar to another end is …

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