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*Answer can only contain numeric values

QUESTION: 1

A 60 V peak full wave rectified voltage is applied to a capacitor input filter. If f = 120Hz, R_{L}=10Ω and C=10μF, the ripple voltage (V) is :

Solution:

Peak to peak ripple voltage for capacitor input filter,

The correct answer is: 5

*Answer can only contain numeric values

QUESTION: 2

If a zener diode (V_{z} = 5V and l_{z} = 10 mA) is connected in series with a resistance and 20V is applied across the combination, then the maximum resistance one can use without spoiling zener action (in kΩ) is :

Solution:

The principal use of a zener diode is in a voltage regulator. In a voltage regulator, the voltage across the load remains constant over a range of current.

The correct answer is: 1.5

*Answer can only contain numeric values

QUESTION: 3

If the peak output voltage of a full-wave rectifier is 10V, its dc voltage (V) is :

Solution:

The correct answer is: 6.36

*Answer can only contain numeric values

QUESTION: 4

For the rectifier circuit shown in figure, the sinusoidal voltage (V_{1} or V_{2}) at the output transformer has a maximum value of 10 V. The load resistance R_{L }is 1kΩ. What is the value of l_{av} as a multiple of

Solution:

The correct answer is: 20

*Answer can only contain numeric values

QUESTION: 5

What is the diode current (A) in the circuit:

Solution:

Diode will be in conducting state, when forward biased voltage is applied to it and in non-conducting state, when reverse biased voltage is applied to it. Now, the two batteries may be replaced by a single battery of 2Vwhich will make the diode reverse biased and diode goes to non-conducting state and hence current is zero

The correct answer is: 0

*Answer can only contain numeric values

QUESTION: 6

A zener diode has a breakdown voltage of 9.1 V with maximum power dissipation of 364mW. What the maximum current A that the diode can withstand?

Solution:

Maximum current

The correct answer is: 0.04

*Answer can only contain numeric values

QUESTION: 7

For a zener diode, V_{z} = 20 V and power rating of 0.2W. If the source battery provides a potential difference of 50 V. The minimum value of R_{s} in Ω that prevents zener diode from being destroyed is.

Solution:

Maximum zener current

Minimum value of R_{s}=

The correct answer is: 3000

*Answer can only contain numeric values

QUESTION: 8

A silicon diode is in series with a 1.0kΩ resistor and a 5V battery. If the node is connected to the positive battery terminal, the cathode voltage with respect to the negative battery terminal is (in Volts)

Solution:

The cathode voltage with respect to the negative battery terminal is

The correct answer is: 4.3

*Answer can only contain numeric values

QUESTION: 9

If R_{L} = 1kΩ, find the maximum zener current (in mA).

Solution:

Voltage developed across always.

For maximum current l (and hence also zener current l_{z}),V_{in} = 25V.

Applying KVL across loop 1, we have

(25 -10 ) = 10 x 10^{3} x **l
**

Hence, maximum zener current.

l

= 5

The correct answer is: 5

*Answer can only contain numeric values

QUESTION: 10

Find the voltage (V) across the 2kΩ resistance

Solution:

We know that, zener diode acts as a **dc** voltage stabilizer, hence, the voltage developed across **2kΩ** resistance is **10 V.**

The correct answer is: 10

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