Electronics and Communication Engineering - Analog Electronics

6. 

A 120 V, 30 Hz source feeds a half wave rectifier circuit through a 4 : 1 step down transformer, the average output voltage is

A. 30 V
B. 13.5 V
C. 10 V
D. 7.07 V

Answer: Option B

Explanation:

.


7. 

The slew rate of an ideal op-amp is

A. very slow
B. slow
C. fast
D. infinitely fast

Answer: Option D

Explanation:

Slew rate signifies the fastest change which can occurs in output voltage. In an ideal op-amp the output can change instantaneously.


8. 

Regulation of the DC power supply of 12 V, 100 mA is the effective resistance of power supply is 20 Ω

A. 22%
B. 131%
C. 30%
D. 20%

Answer: Option D

Explanation:

.


9. 

A bridge diode circuit using ideal diodes has in input voltage of 20 sin ωt volts. The average and rms values of output voltage are

A.
B.
C.
D.

Answer: Option A

Explanation:

.


10. 

In the circuit of figure v1 = 8 V and v2 = 0. Which diode will conduct (Assume ideal diodes)?

A. D1 only
B. D2 only
C. Both D1 and D2
D. Neither D1 nor D2

Answer: Option A

Explanation:

Since only v1 is positive and more than 0.7 V only D1 will conduct.