Basic Electronics

1. 1. Which circuit is used for obtaining desired output waveform in operational amplifier?
a) Clipper
b) Clamper
c) Peak amplifier
d) Sample and hold
2. 2. The clipping level in op-amp is determined by
a) AC supply voltage
b) Control voltage
c) Reference voltage
d) Input voltage
3. In a positive clipper, the diode conducts when
a) Vin < Vref
b) Vin = Vref
c) Vin > Vref
d) None of the mentioned
4. A positive small signal halfwave rectifier can
a) Rectify signals with peak value only
b) Rectify signals with value of few millivolts only
c) Rectify signals with both peak value and down to few millivolts
d) None of the mentioned
5. Diode in small signal positive halfwave rectifier circuit acts as
a) Ideal diode
b) Clipper diode
c) Clamper diode
d) Rectifier diode
6. A circuit with a predetermined dc level is added to the output voltage of the op-amp
is called
a) Clamper
b) Positive clipper
c) Halfwave rectifier
d) None of the mentioned

2. 7. What is the circuit in the given diagram called?
a) Clipper
b) Clamper
c) Half wave rectifier
d) Full wave rectifier
8. What is the circuit in the given diagram called?
a) Clipper
b) Clamper
c) Half wave rectifier
d) Full wave rectifier
9. For a sinusoidal input of 20 Vpeak to the given circuit, what is the peak value of the
output waveform?
a) 20 V
b) 25 V
c) 0 V
d) -25 V

3. 10. For the given circuit for a 20 Vpeak sinusoidal input vi, what is the value of vi at which
the clipping begins?
a) 5 V
b) 0 V
c) -5 V
d) Clipping doesn’t occur
11. For a sinusoidal input of 20 Vpeak to the given circuit, what is the minimum value of the
output waveform?
a) 20 V
b) 25 V
c) -25 V
d) 0 V
12. For the given input waveform to the given circuit, what is the peak value of the output
waveform?
a) 0 V
b) 16 V
c) 12 V
d) 0 V

4. 13. For the given input waveform to the given circuit, what is the minimum value of the
output waveform?
a) 4 V
b) 16 V
c) 12 V
d) 0 V
14. Which of the following is not a necessary component in a clamper circuit?
a) Diode
b) Capacitor
c) Resistor
d) Independent DC Supply
15. For the given circuit and input waveform, the peak value of the output is +30V.
a) True
b) False
Determine the total discharge time for the capacitor in a clamper having C = 0.01 F and R = 500 k
.
A. 5 ms
B. 25 ms
C. 2.5 ms
D. 50 ms
What type of diode circuit is used to clip off portions of signal voltages above or below certain levels?
A. clipper or limiter
B. clamper
C. IC voltage regulator

5. D. none of the above
The output frequency of a full-wave rectifier is ________ the input frequency.
A. one-half
B. equal to
C. twice
D. one-quarter
Determine the peak value of the current through the load resistor.
A. 2.325 mA
B. 5 mA
C. 1.25 mA
D. 0 mA
Determine the peak value of the output waveform.
A. 25 V
B. 15 V
C. –25 V
D. –15 V

6. A short circuit has a ________ drop across its terminals, and the current is limited only by the
surrounding network.
A. 5 V
B. 0 V
C. 1 V
D.
Determine the peak for both half cycles of the output waveform.
A. 16 V, –4 V
B. 16 V, 4 V
C. –16 V, 4 V
D. –16 V, –4 V
What type of diode circuit is used to add or restore a dc level to an electrical signal?
A. clipper or limiter
B. clamper
C. IC voltage regulator
D. none of the above
Determine ID2.

7. A. 6.061 mA
B. 0.7 mA
C. 3.393 mA
D. 3.571 mA
Determine the average value of the current through the load resistor.
A. 2.5 mA
B. 0 mA
C. 1.37 mA
D. 1.479 mA
What best describes the circuit?
A. Full-wave rectifier
B. Half-wave rectifier
C. Clipper
D. Clamper

8. What is the PIV for each diode in a full-wave center-tapped rectifier? Note: Vp(out) = peak output
voltage.
A. Vp(out) – 0.7 V
B. Vp(out) + 0.7 V
C. 2Vp(out) – 0.7 V
D. 2Vp(out) + 0.7 V
Determine ID2.
A. 29.40 mA
B. 30.30 mA
C. 14.70 mA
D. None of the above
Determine the current level if E = 15 V and R = 3 k .
A. 0 A
B. 4.76 mA
C. 5 mA
D. 5 A

9. If the ac supply is 50 Hz, what will be the ripple frequency out of the full-wave rectifier?
A. 50 Hz
B. 60 Hz
C. 100 Hz
D. 120 Hz

10. Find the current in the circuit.
a) 1 A
b) 2 A
c) 3 A
d) 4 A
In a series circuit, which of the parameters remain constant across all circuit elements such
as resistor, capacitor and inductor etcetera?
a) Voltage
b) Current
c) Both voltage and current
d) Neither voltage nor current
Voltage across the 60ohm resistor is______
a) 72V

11. b) 0V
c) 48V
d) 120V
Find the voltage across the 6 ohm resistor.
a) 150V
b) 181.6V
c) 27.27V
d) 54.48V
If there are two bulbs connected in series and one blows out, what happens to the other
bulb?
a) The other bulb continues to glow with the same brightness
b) The other bulb stops glowing
c) The other bulb glows with increased brightness
d) The other bulb also burns out

12. What is the value of x if the current in the circuit is 5A?
a) 15 ohm
b) 25 ohm
c) 55 ohm
d) 75 ohm
A voltage across a series resistor circuit is proportional to?
a) The amount of time the circuit was on for
b) The value of the resistance itself
c) The value of the other resistances in the circuit
d) The power in the circuit
Many resistors connected in series will?
a) Divide the voltage proportionally among all the resistors
b) Divide the current proportionally
c) Increase the source voltage in proportion to the values of the resistors
d) Reduce the power to zero
What is the voltage measured across a series short?
a) Infinite
b) Zero
c) The value of the source voltage
d) Null

13. What happens to the current in the series circuit if the resistance is doubled?
a) It becomes half its original value
b) It becomes double its original value
c) It becomes zero
d) It becomes infinity
It is preferable to connect bulbs in series or in parallel?
a) Series
b) Parallel
c) Both series and parallel
d) Neither series nor parallel
Calculate the total resistance between the points A and B.
a) 7 ohm
b) 0 ohm
c) 7.67 ohm
d) 0.48 ohm
Calculate the equivalent resistance between A and B.

14. a) 60 ohm
b) 15 ohm
c) 12 ohm
d) 48 ohm
Calculate the resistance between A and B.
a) 3.56 ohm
b) 7 ohm
c) 14.26 ohm
d) 29.69 ohm
Batteries are generally connected in______
a) Series
b) Parallel
c) Either series or parallel
d) Neither series nor parallel
In a _________ circuit, the total resistance is greater than the largest resistance in the
circuit.
a) Series
b) Parallel
c) Either series or parallel
d) Neither series nor parallel
In a ____________ circuit, the total resistance is smaller than the smallest resistance in the
circuit.
a) Series

15. b) Parallel
c) Either series or parallel
d) Neither series nor parallel
Which is the most cost efficient connection?
a) Series
b) Parallel
c) Either series or parallel
d) Neither series nor parallel
Calculate the equivalent resistance between A and B.
a) 2 ohm
b) 4 ohm
c) 6 ohm
d) 8 ohm
Calculate the equivalent resistance between A and B.
a) 6.67 ohm
b) 46.67 ohm
c) 26.67 ohm
d) 10.67 ohm

16. When parallel resistors are of three different values, which has the greatest power loss?
A. The smallest resistance
B. The largest resistance
C. They have the same power loss.
D. Voltage and resistance values are needed.
The voltage across any branch of a parallel circuit:
A. varies as the total current varies
B. is inversely proportional to total circuit resistance
C. is equally applied to all branch conductances
D. is dropped in proportion to each branch resistance
What is the total power loss if 2 k and 1 k parallel-connected resistors have an IT of 3 mA?
A.
6 W
B.
36 W
C. 6 mW
D. 36 mW
What happens to total resistance in a circuit with parallel resistors if one of them opens?
A. It increases.
B. It halves.
C. It remains the same.
D. It decreases.