The input impedance of short-circuited line of length l where ?/4 < l

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Correct Answer

capacitive

Explanation

l < ?/4, Z_L = 0

The input impedance of short-circuited line of length l where ?/4 < l < ?/2, is resistive inductive , if Z_d comes +j kZ_C then inductive,

If Z_d comes -j kZ_C then capacitive.

for 0 ? l ? 1/4, ? ? l ? 3?/4 will be inductive.

The input impedance of short-circuited line of length l where ?/4 < l < ?/2, is resistive inductive

2. A single phase electric heater uses phase controlled thyristors. The firing angle is 90�. The degree of heating is
Options
A. 25% of maximum
B. 50% of maximum
C. 75% of maximum
D. none of the above

5. Assertion (A): A class C chopper can operate in first and second quadrants
Reason (R): A class B chopper operates only in second quadrant.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

9. By inserting a plate of dielectric between the plates of a parallel plate capacitor, the energy stored in the capacitor is increased five times. The dielectric constant of material is
Options
A.
B.
C. 5
D. 25

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