MCQOPTIONS
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MCQOPTIONS
This section includes 213 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
With a total resistance of 3300 ohms and a 45 V source, if R is 1200 ohms, what will be its voltage drop? |
| A. | 16.36 V |
| B. | 32.72 V |
| C. | 10.90 V |
| D. | 15.00 V |
| Answer» B. 32.72 V | |
| 2. |
Given a series circuit containing resistors of different values, which statement is ? |
| A. | The current through each resistor is the same. |
| B. | The sum of the voltage drops across each resistive element will be equal to source voltage. |
| C. | The total resistance is the sum of the value of the resistors. |
| D. | The voltage drop across each resistor is the same. |
| Answer» E. | |
| 3. |
When 50 V is applied to four series resistors, 100 µA flows. If = 12 k , = 47 k, and = 57 k, what is the value of ? |
| A. | 38.4 k |
| B. | 3.84 k |
| C. | 384 k |
| D. | 3.84 M |
| Answer» D. 3.84 M | |
| 4. |
If 7.3 k, 1.8 k, and 4.9 k resistors are wired in series, the total resistance is 14 k. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
is the reference point from which voltages are measured in an electronic circuit. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Voltage sources are added when they are . |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
If four 9 V batteries are connected , the total voltage is 36 V. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
The total resistance is 35 . |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
If a 47 and a 68 resistor are connected in series, the total resistance is ___. |
| A. | 3,196 |
| B. | less than 47 |
| C. | less than 68 |
| D. | 115 |
| Answer» E. | |
| 10. |
If four 90 resistors are connected in series across an 18 V source, the current equals ___. |
| A. | 50 mA |
| B. | 0.2 A |
| C. | 5 A |
| D. | 20 A |
| Answer» B. 0.2 A | |
| 11. |
If a 3.9 k, a 7.5 k, and a 5.6 k resistor are connected in series with a 34 V source, the voltage dropped across the 7.5 k resistor equals _____. |
| A. | 34 V |
| B. | 15 V |
| C. | 7.8 V |
| D. | 11.2 V |
| Answer» C. 7.8 V | |
| 12. |
If a 220 , a 100 , and a 180 resistor are connected in series across a 12 V source, the circuit current equals ___. |
| A. | 41.67 A |
| B. | 120 mA |
| C. | 500 A |
| D. | 24 mA |
| Answer» E. | |
| 13. |
Kirchhoffs voltage law states that: |
| A. | the sum of the voltage drops in a series circuit is equal to the total applied voltage |
| B. | the algebraic sum of the resistances is equal to the sum of the voltages |
| C. | the algebraic sum of the individual currents around a closed loop is zero |
| D. | the voltages developed across each element in a series circuit are identical |
| Answer» B. the algebraic sum of the resistances is equal to the sum of the voltages | |
| 14. |
–1.2 V, +15 V, and –6 V batteries are connected in series. The magnitude of total voltage is _________. |
| A. | 7.8 V |
| B. | 10.2 V |
| C. | 22.2 V |
| D. | 1.3 V |
| Answer» B. 10.2 V | |
| 15. |
If five equal resistors are connected in series with a 20 V source, and a current of 400 µA is measured, each resistor equals ___. |
| A. | 10 k |
| B. | 50 k |
| C. | 125 |
| D. | 20 |
| Answer» B. 50 k | |
| 16. |
When 50 V is applied to four series resistors, 100 µA flows. If R1 = 12 k , R2 = 47 k, and R3 = 57 k, what is the value of R4? |
| A. | 38.4 k |
| B. | 3.84 k |
| C. | 384 k |
| D. | 3.84 M |
| Answer» D. 3.84 M | |
| 17. |
Series aiding is a term sometimes used to describe voltage sources of the same polarity in series. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
Two 1.5 V cells are connected series opposing across two 100 resistors in series. Total current flow is |
| A. | 15 mA |
| B. | 5 mA |
| C. | 2 mA |
| D. | 0 A |
| Answer» E. | |
| 19. |
The total resistance of a circuit is 680 . The percentage of the total voltage appearing across a 47 resistor that makes up part of the total series resistance is |
| A. | 68% |
| B. | 47% |
| C. | 69% |
| D. | 6.91% |
| Answer» E. | |
| 20. |
The following resistors (one each) are connected in a series circuit: 470 , 680 , 1 k, and 1.2 k. The voltage source is 20 V. Current through the 680 resistor is approximately |
| A. | 60 mA |
| B. | 30 mA |
| C. | 6 mA |
| D. | 300 mA |
| Answer» D. 300 mA | |
| 21. |
A series circuit consists of a 4.7 k, a 12 k, and a 2.2 k resistor. The resistor that has the most voltage drop is |
| A. | the 12 k |
| B. | the 2.2 k |
| C. | the 4.7 k |
| D. | impossible to determine from the given information |
| Answer» B. the 2.2 k | |
| 22. |
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 |
| Answer» B. It becomes double its original value | |
| 23. |
What is the voltage measured across a series short? |
| A. | Infinite |
| B. | Zero |
| C. | The value of the source voltage |
| D. | Null |
| Answer» C. The value of the source voltage | |
| 24. |
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 |
| Answer» B. Divide the current proportionally | |
| 25. |
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 |
| Answer» C. The value of the other resistances in the circuit | |
| 26. |
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 |
| Answer» B. 25 ohm | |
| 27. |
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 |
| Answer» C. The other bulb glows with increased brightness | |
| 28. |
Find the voltage across the 6 ohm resistor. |
| A. | 150V |
| B. | 181.6V |
| C. | 27.27V |
| D. | 54.48V |
| Answer» D. 54.48V | |
| 29. |
Voltage across the 60ohm resistor is______ |
| A. | 72V |
| B. | 0V |
| C. | 48V |
| D. | 120V |
| Answer» C. 48V | |
| 30. |
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 |
| Answer» C. Both voltage and current | |
| 31. |
Find the current in the circuit. |
| A. | 1 A |
| B. | 2 A |
| C. | 3 A |
| D. | 4 A |
| Answer» C. 3 A | |
| 32. |
Find the current in the circuit shown below. |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.3 |
| D. | 0.4 |
| Answer» D. 0.4 | |
| 33. |
In the circuit shown below determine the total impedance. |
| A. | 161 |
| B. | 162 |
| C. | 163 |
| D. | 164 |
| Answer» C. 163 | |
| 34. |
Determine the voltage across the resistor in the circuit shown below. |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 35. |
Find the voltage across the capacitor in the circuit shown below. |
| A. | 7 |
| B. | 7.5 |
| C. | 8 |
| D. | 8.5 |
| Answer» E. | |
| 36. |
An AC voltage source supplies a 500Hz, 10V rms signal to a 2kΩ resistor in series with a 0.1µF capacitor as shown in the following figure. Find the total impedance. |
| A. | 3750.6Ω |
| B. | 3760.6Ω |
| C. | 3780.6Ω |
| D. | 3790.6Ω |
| Answer» C. 3780.6Ω | |
| 37. |
Determine the source voltage if voltage across resistance is 70V and the voltage across inductor is 20V as shown in the figure. |
| A. | 71 |
| B. | 72 |
| C. | 73 |
| D. | 74 |
| Answer» D. 74 | |
| 38. |
In the circuit shown below, find voltage across inductive reactance. |
| A. | 9.5 |
| B. | 10 |
| C. | 9 |
| D. | 10.5 |
| Answer» B. 10 | |
| 39. |
In the circuit shown below, find the voltage across resistance. |
| A. | 0.303 |
| B. | 303 |
| C. | 3.03 |
| D. | 30.3 |
| Answer» D. 30.3 | |
| 40. |
Find the current I (mA) in the circuit shown below. |
| A. | in the circuit shown below.a) 3.03 |
| B. | 30.3 |
| C. | 303 |
| D. | 0.303 |
| Answer» B. 30.3 | |
| 41. |
The circuit shown below consists of a 1kΩ resistor connected in series with a 50mH coil, a 10V rms, 10 KHz signal is applied. Find impedance Z in rectangular form. |
| A. | (1000+j0.05) Ω |
| B. | (100+j0.5) Ω |
| C. | (1000+j3140) Ω |
| D. | (100+j3140) Ω |
| Answer» D. (100+j3140) Ω | |
| 42. |
If we apply a sinusoidal input to RL circuit, the current in the circuit is __________ and the voltage across the elements is _______________ |
| A. | square, square |
| B. | square, sinusoid |
| C. | sinusoid, square |
| D. | sinusoid, sinusoid |
| Answer» E. | |
| 43. |
When is tanφ negative? |
| A. | When inductive reactance is less than capacitive reactance |
| B. | When inductive reactance is greater than capacitive reactance |
| C. | When inductive reactance is equal to capacitive reactance |
| D. | When inductive reactance is zero |
| Answer» B. When inductive reactance is greater than capacitive reactance | |
| 44. |
In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the capacitive reactance in the circuit. |
| A. | 316 ohm |
| B. | 195 ohm |
| C. | 124 ohm |
| D. | 212 ohm |
| Answer» E. | |
| 45. |
Which of the following is not ac waveform? |
| A. | sinusoidal |
| B. | square |
| C. | constant |
| D. | triangular |
| Answer» D. triangular | |
| 46. |
In an RLC circuit, the power factor is always ____________ |
| A. | Positive |
| B. | Negative |
| C. | Depends on the circuit |
| D. | Zero |
| Answer» D. Zero | |
| 47. |
Can ohm’s law be applied in an ac circuit? |
| A. | Yes |
| B. | No |
| C. | Depends on the rms current |
| D. | Depends on the rms voltage |
| Answer» B. No | |
| 48. |
The correct expression for the instantaneous current in a resistive circuit is? |
| A. | i=Vm(sint)/R |
| B. | i=Vm(cost)/R |
| C. | i=V(sint)/R |
| D. | i=V(cost)/R |
| Answer» B. i=Vm(cost)/R | |
| 49. |
Calculate the resistance in the circuit if the rms voltage is 20V and the rms current is 2A. |
| A. | 2 ohm |
| B. | 5 ohm |
| C. | 10 ohm |
| D. | 20 ohm |
| Answer» D. 20 ohm | |
| 50. |
In ac circuit, resistance 5 ohm is connected with capacitor having capacitive reactance 12 ohm. Supply of 260 V is connected to the circuit. Calculate the current in the circuit. |
| A. | 40 A |
| B. | 10 A |
| C. | 20 A |
| D. | 30 A |
| Answer» D. 30 A | |