Analog Test 1

7/27/2019 Analog Test 1

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Institute Of Engineering Studies (IES Bangalore) Analog Test-I (Topics: Diode Ckts)

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1.In the following limiter circuit an input voltage is applied . Assume diode drop is 0.7

V when it is forward biased . Zener break down voltage is 6.8 V . The max and min values of o/prespectively are

(a)6.1 V , -0.7 V (b) 0.7 V , -7.5 V (c) 7.5 V , - 0.7 V (d) 7.5 V , - 7.5 V

2.The o/p voltage of the circuit shown is

(a)zero (b) 5.7 V (c) 6.9 V (d) 12.6 V

3. A 5V reference is drawn from the circuit shown in figure . Zener diode of 400 mw and 5V with firing

current of 5 mA is used . The value of is

(a)50 (b) 500 (c) 75 (d) 470

4. What is the output wave form for a sinusoidal i/p of peak to peak amplitude of 4V. Assume that and are two identical Zener diodes of 4.7 V , and &

O

D

V

Z6.8V

O O

1k

+

V

1

O

oi

_

O

6.3 V

V

O O

1k

V

O

oi

6.3 V

= 13 V

5mA 95 mA

5V

Vo10V

R s


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(a)same as i/p(b) Sinusoidal wave form with 5.4 V peak

(c)Sinusoidal wave form clamped to +/- 4.7 V peak(d) Sinusoidal wave form clamped to +/- 5.4V peak

5.What is the voltage across the 900 load in the circuit given below

(a)10V (b) 14.67 V (c) 20V (d) 9.47 V

6.In this , V is a sinusoid i/p with frequency f current i contains

(a)only f (b) All harmonics of f(c)only even harmonics of f (d) only odd harmonics of f

7.Ripple factor for a Half wave Rectifier is(a)1.65 (b) 1.45 (c) 1 (d) 1.21

8.For the circuit shown , find . Given that I = 2A ,

V

R1

2

0

R

i

10 V

900

1k

20 V

500

35 V


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9.A full wave rectifier with Si diodes has load of 2k . The transformer primary voltage is 230V rms .

with frequency of 50 Hz, 10 : 1 turns ratio . Find (a) load voltage (b) load current (c)frequency of load voltage .

4

1

2

3

.

V

V..

. V

I

V

Analog Test 1

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