Electronics and Communication Engineering - Exam Questions Papers

11. 

Which of the following is not an electromagnetic device?

A. Hall transducer
B. Transformer
C. Speedometer
D. Eddy current damping device

Answer: Option A

Explanation:

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12. 

In which direction is the plane wave E = 50 sin (108t + 2z) V/m (where is the unit vector in y-direction), travelling?

A. along y direction
B. along -y direction
C. along z direction
D. along -z direction

Answer: Option D

Explanation:

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13. 

Which one of the following compounds is widely used for making ferrites?

A. FeO
B. CuO
C. MgO
D. Fe2O3

Answer: Option D

Explanation:

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14. 

Assertion (A): Cut-in voltage for Germanium diode is greater than that for silicon diode.

Reason (R): Germanium diode has a higher reverse saturation current than silicon diode.

A. Both A and R are individually true and R is the correct explanation of A
B. Both A and R are individually true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option D

Explanation:

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15. 

Laplace transform of unit triplet function is __________ .

A. 1
B. s
C. s2
D.

Answer: Option C

Explanation:

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