Electronics and Communication Engineering - Analog Electronics

46. 

In a capacitor filter, the time constant RLC should be small.

A. True
B. False

Answer: Option B

Explanation:

Time constant should be large.


47. 

A 741 type op-amp has a gain bandwidth product of 1 MHz. A non-inverting amplifier using this op-amp and having a voltage gain of 20 dB will exhibit a -3dB bandwidth of

A. 50 kHz
B. 100 kHz
C.
D.

Answer: Option B

Explanation:

As we know, Gain Bandwidth, Product = β x A

106 = β x A

20 log A = 20

A = 10' 10

β = 100 kHz.


48. 

In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half the secondary winding is 40 V. If diodes are ideal, the average output voltage is

A. 40 V
B. 25.5 V
C. 20 V
D. 2.55 V

Answer: Option B

Explanation:

.


49. 

In the circuit of figure, PIV can be up to

A. Em
B. 2 Em
C. 0.5 Em
D. 2 Em

Answer: Option B

Explanation:

Peak inverse voltage can be upto 2Em since capacitor can store charge equal to Em.


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