Electronics and Experimental Methods (CSIR Physical Sciences): Questions 27 - 29 of 41

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Question number: 27

» Electronics and Experimental Methods » Microprocessor and Microcontroller Basics

Appeared in Year: 2011

MCQ▾

Question

The pins 0, 1, 2 and 3 of part A of a microcontroller are connected with resistors to drive an LED at various intensities as shown in the figure.

 Four pins connected with resistor

Four Pins Connected With Resistor

In figure pins 0, 1, 2, 3 of part A of a microcontroller are connected with resistors to drive an LED at various intensities.

For VCC=4.2V and a voltage drop of 1.2V across the LED, the range (maximum current) and resolution (Step size) of the drive current are, respectively, - (December)

Choices

Choice (4) Response

a.

7.5mAand0.5mA

b.

15.0mAand1.0mA

c.

4.0mAand0.5mA

d.

4.0mAand1.0mA

Question number: 28

» Electronics and Experimental Methods » Device Structure

Appeared in Year: 2013

MCQ▾

Question

The conductor in a 0.75 km long two – wire transmission lines are separated by a centre – to – centre distance of 0.2 m. If each conductor has a diameter of 4 cm, then the capacitance of the line is – (June)

Choices

Choice (4) Response

a.

8.85μF

b.

88.5nF

c.

8.85pF

d.

8.85nF

Question number: 29

» Electronics and Experimental Methods » A-D and D-a Converters

Appeared in Year: 2013

MCQ▾

Question

A 4 – variable switching function is given by, f=Σ(5, 7,8,10, 13, 15)+d(0, 1,2) ; where d is the do not care condition. The minimized form of f in sum of products (SOP) from is – (Dec– 2013)

Choices

Choice (4) Response

a.

AD+BC

b.

A¯C¯+B¯D¯

c.

AB¯+CD¯

d.

B¯D¯+BD

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