MCQOPTIONS
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MCQOPTIONS
This section includes 553 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is |
| A. | 25% |
| B. | 50% |
| C. | 1% |
| D. | 100% |
| Answer» B. 50% | |
| 2. |
A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is |
| A. | 6 V |
| B. | 30 V |
| C. | 35 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 3. |
If the rms current through a 6.8 k resistor is 8 mA, the rms voltage drop across the resistor is |
| A. | 5.44 V |
| B. | 54.4 V |
| C. | 7.07 V |
| D. | 8 V |
| Answer» C. 7.07 V | |
| 4. |
The average half-cycle value of a sine wave with a 40 V peak is |
| A. | 25.48 V |
| B. | 6.37 V |
| C. | 14.14 V |
| D. | 50.96 V |
| Answer» B. 6.37 V | |
| 5. |
A square wave has a period of 60 s. The first odd harmonic is |
| A. | 5 kHz |
| B. | 50 kHz |
| C. | 500 kHz |
| D. | 33.33 kHz |
| Answer» C. 500 kHz | |
| 6. |
A 12 k resistor is in series with a 0.02 F capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.30 mA, what is the source voltage expressed in polar form? |
| A. | 45.6 V |
| B. | 411.3 V |
| C. | 0.411 V |
| D. | 4.11 V |
| Answer» E. | |
| 7. |
A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is |
| A. | 0 Hz |
| B. | 12 kHz |
| C. | 6 kHz |
| D. | 18 kHz |
| Answer» D. 18 kHz | |
| 8. |
For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is |
| A. | 19.52 W |
| B. | 195.2 W |
| C. | 275 W |
| D. | 25 W |
| Answer» C. 275 W | |
| 9. |
What is the value of the hypotenuse of a right triangle whose sides are 12 and 18? |
| A. | 4.24 |
| B. | 3.46 |
| C. | 2.16 |
| D. | 21.63 |
| Answer» E. | |
| 10. |
In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is |
| A. | 200 mA |
| B. | 100 mA |
| C. | 282 mA |
| D. | 141 mA |
| Answer» E. | |
| 11. |
A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k. Current flow in the circuit is |
| A. | 9.2 mA |
| B. | 92 mA |
| C. | 4.6 mA |
| D. | 460 mA |
| Answer» D. 460 mA | |
| 12. |
A 20 kHz pulse waveform consists of pulses that are 15 s wide. The duty cycle |
| A. | is 1% |
| B. | is 30% |
| C. | is 100% |
| D. | cannot be determined |
| Answer» C. is 100% | |
| 13. |
When a sine wave has a frequency of 100 Hz in 12 s it goes through |
| A. | 1/100 cycle |
| B. | 12 cycles |
| C. | 120 cycles |
| D. | 1,200 cycles |
| Answer» E. | |
| 14. |
A sawtooth wave has a period of 10 ms. Its frequency is |
| A. | 10 Hz |
| B. | 50 Hz |
| C. | 100 Hz |
| D. | 1,000 Hz |
| Answer» D. 1,000 Hz | |
| 15. |
If the peak of a sine wave is 13 V, the peak-to-peak value is |
| A. | 6.5 V |
| B. | 13 V |
| C. | 26 V |
| D. | none of the above |
| Answer» D. none of the above | |
| 16. |
A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is |
| A. | 45.12 mA |
| B. | 16 mA |
| C. | 39.6 mA |
| D. | 22.6 mA |
| Answer» D. 22.6 mA | |
| 17. |
In the complex plane, the number 4 + j3 is located in the |
| A. | first quadrant |
| B. | second quadrant |
| C. | third quadrant |
| D. | fourth quadrant |
| Answer» B. second quadrant | |
| 18. |
When the frequency of the source voltage decreases, the impedance of a parallel RC circuit |
| A. | increases |
| B. | decreases |
| C. | does not change |
| D. | decreases to zero |
| Answer» B. decreases | |
| 19. |
A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q, the bandwidth will |
| A. | increase |
| B. | remain the same |
| C. | decrease |
| D. | be less selective |
| Answer» D. be less selective | |
| 20. |
A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is |
| A. | 7 kHz |
| B. | 13 kHz |
| C. | 20 kHz |
| D. | 6 kHz |
| Answer» E. | |
| 21. |
A 24 resistor, an inductor with a reactance of 120 , and a capacitor with a reactance of 120 are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is |
| A. | 60 V |
| B. | 660 V |
| C. | 30 V |
| D. | 300 V |
| Answer» E. | |
| 22. |
If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth |
| A. | disappears |
| B. | becomes sharper |
| C. | increases |
| D. | decreases |
| Answer» E. | |
| 23. |
A 90 resistor, a coil with 30 of reactance, and a capacitor with 50 of reactance are in series across a 12 V ac source. The current through the resistor is |
| A. | 9 mA |
| B. | 90 mA |
| C. | 13 mA |
| D. | 130 mA |
| Answer» E. | |
| 24. |
A 2 k resistor and a 0.002 F capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is |
| A. | 84.5 mW |
| B. | 845 mW |
| C. | 13 mW |
| D. | 130 mW |
| Answer» B. 845 mW | |
| 25. |
When the frequency of the voltage applied to a series RC circuit is increased, the phase angle |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | becomes erratic |
| Answer» C. remains the same | |
| 26. |
In a series RC circuit, when the frequency and the resistance are halved, the impedance |
| A. | doubles |
| B. | is halved |
| C. | is reduced to one-fourth |
| D. | cannot be determined without values |
| Answer» E. | |
| 27. |
What is the angular difference between +j4 and j4? |
| A. | 30 |
| B. | 90 |
| C. | 180 |
| D. | 270 |
| Answer» D. 270 | |
| 28. |
Find I1. 4I1 + 4I2 = 2 6I1 + 7I2 = 4 |
| A. | 0.5 A |
| B. | 50 mA |
| C. | 0.5 A |
| D. | 50 mA |
| Answer» D. 50 mA | |
| 29. |
Using the mesh current method, find the branch current, IR1, in the above figure. |
| A. | 115 mA |
| B. | 12.5 mA |
| C. | 12.5 A |
| D. | 135 mA |
| Answer» B. 12.5 mA | |
| 30. |
In assigning the direction of branch currents, |
| A. | the directions are critical |
| B. | the directions are not critical |
| C. | they must point into a node |
| D. | they must point out of a node |
| Answer» C. they must point into a node | |
| 31. |
A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is |
| A. | 4 V |
| B. | 4.6 V |
| C. | 1.6 V |
| D. | 11 V |
| Answer» B. 4.6 V | |
| 32. |
A signal with a 400 s period has a frequency of |
| A. | 250 Hz |
| B. | 2,500 Hz |
| C. | 25,000 Hz |
| D. | 400 Hz |
| Answer» C. 25,000 Hz | |
| 33. |
What is the voltage drop across R1? |
| A. | 850 mV |
| B. | 7.82 V |
| C. | 9.18 V |
| D. | 918 mV |
| Answer» C. 9.18 V | |
| 34. |
In the complex plane, the number 14 j5 is located in the |
| A. | first quadrant |
| B. | second quadrant |
| C. | third quadrant |
| D. | fourth quadrant |
| Answer» E. | |
| 35. |
A 15 resistor, a 220 H coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit? |
| A. | 138 MHz |
| B. | 10,866 Hz |
| C. | 1,907 Hz |
| D. | 138 kHz |
| Answer» C. 1,907 Hz | |
| 36. |
A 12 resistor, a 40 F capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is |
| A. | 28.1 Hz |
| B. | 281 Hz |
| C. | 2,810 Hz |
| D. | 10 kHz |
| Answer» C. 2,810 Hz | |
| 37. |
A positive angle of 30 is equivalent to a negative angle of |
| A. | 30 |
| B. | 330 |
| C. | 60 |
| D. | 180 |
| Answer» C. 60 | |
| 38. |
In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is |
| A. | 3 V |
| B. | 27 V |
| C. | 19.2 V |
| D. | 1.9 V |
| Answer» D. 1.9 V | |
| 39. |
How many degrees are there in /3 rad? |
| A. | 6 |
| B. | 60 |
| C. | 180 |
| D. | 27 |
| Answer» C. 180 | |
| 40. |
One sine wave has a positive-going zero crossing at 15 and another sine wave has a positive-going zero crossing at 55 . The phase angle between the two waveforms is |
| A. | 0 |
| B. | 45 |
| C. | 40 |
| D. | none of the above |
| Answer» D. none of the above | |
| 41. |
To produce an 800 Hz sine wave, a four-pole generator must be operated at |
| A. | 200 rps |
| B. | 400 rps |
| C. | 800 rps |
| D. | 1,600 rps |
| Answer» C. 800 rps | |
| 42. |
Find I2. 4I1 + 4I2 = 2 6I1 + 7I2 = 4 |
| A. | 1 A |
| B. | 1 A |
| C. | 100 mA |
| D. | 100 mA |
| Answer» B. 1 A | |
| 43. |
The winding resistance of a coil can be increased by |
| A. | increasing the number of turns |
| B. | using a thinner wire |
| C. | changing the core material |
| D. | increasing the number of turns or using thinner wire |
| Answer» E. | |
| 44. |
What is the current through R2? |
| A. | 177 mA |
| B. | 250 mA |
| C. | 500 mA |
| D. | 125 mA |
| Answer» B. 250 mA | |
| 45. |
The expansion method for evaluating determinants is |
| A. | better than any other method |
| B. | good for only one determinant |
| C. | more flexible than the cofactor method |
| D. | good for second- and third-order determinants |
| Answer» E. | |
| 46. |
The first row of a certain determinant has the numbers 10 and 6. The second row has the numbers 3 and 5. The value of this determinant is |
| A. | 18 |
| B. | 50 |
| C. | 32 |
| D. | 32 |
| Answer» D. 32 | |
| 47. |
What is the voltage drop across R3? |
| A. | 112 mV |
| B. | 11.25 V |
| C. | 180 mV |
| D. | 1.80 V |
| Answer» D. 1.80 V | |
| 48. |
The branch current method uses |
| A. | Kirchhoff's voltage and current laws |
| B. | Thevenin's theorem and Ohm's law |
| C. | Kirchhoff's current law and Ohm's law |
| D. | the superposition theorem and Thevenin's theorem |
| Answer» B. Thevenin's theorem and Ohm's law | |
| 49. |
The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is |
| A. | 1.8 mV |
| B. | 18 mV |
| C. | 180 mV |
| D. | 1.25 mV |
| Answer» C. 180 mV | |
| 50. |
Two inductors, L1 and L2, are in parallel. L1 has a value of 25 H and L2 a value of 50 H. The parallel combination is in series with L3, a 20 H coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is |
| A. | 87 mA |
| B. | 870 mA |
| C. | 87 A |
| D. | 337 mA |
| Answer» C. 87 A | |