Electronics and Communication Engineering - Exam Questions Papers

1. 

Which of the following devices is used in the microprocessors?

A. JFET
B. BJT
C. MOSFET
D. CMOS

Answer: Option D

Explanation:

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2. 

A 2 bit binary multiplier can be implemented using

A. 2 inputs ANDs only
B. 2 inputs XORs and 4 input AND gates only
C. Two 2 inputs NORs and one XNOR gate
D. XOR gates and shift registers

Answer: Option C

Explanation:

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3. 

Which one of the following circuits is used for converting a sine wave into a square wave?

A. Astable multivibration
B. Monostable multivibration
C. Bistable multivibration
D. Schmitt trigger

Answer: Option D

Explanation:

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4. 

A super heterodyne receiver has a IF of 465 kHz. It is tuned to a station broadcasting at 500 KHz and its oscillator is operating at 965 KHz, then the 1330 KHz frequency would be

A. adjacent channel frequency
B. image frequency
C. gyro frequency
D. maximum usable frequency

Answer: Option B

Explanation:

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5. 

Following are the properties of impulse function

  1. x(t) ∂(t) = x (0)∂(t)
  2. ∂(- t) = ∂(t)
Choose the correct option

A. 1-true, 2-false, 3-true
B. 1-false, 2-true, 3-true
C. 1-true, 2-true, 3-true
D. 1-true, 2-true, 3-false

Answer: Option C

Explanation:

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