materials-and-components electronics-and-communication-engineering question and answers -Page 16

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Materials and Components problems

2. High frequency inductors and capacitors are commonly plated with silver. The main purpose of this is to
Options
A. reduce dc resistance
B. reduce ac resistance
C. increase dc resistance
D. increase ac resistance

4. Assertion (A): Metals are better heat conductors than insulators.
Reason (R): If is temperature gradient, Q is heat flow density and K is thermal conductivity, then Q = - K (dT/dx).
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

5. Semiconductors have a positive temperature coefficient of resistivity.
Options
A. True
B. False

7. For a given value (n) of principle quantum number, the number of possible electronic states are
Options
A. n
B. n²
C. n³
D. n

8. A sheet of bakelite is inserted between the plates of an air capacitor. The capacitance will
Options
A. increase
B. decrease
C. remain the same
D. may increase or decrease

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