MCQOPTIONS
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MCQOPTIONS
This section includes 27 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If the maximum value of the current is 5v2 A, what will be the value of the average current? |
| A. | 10/p A |
| B. | 5/p A |
| C. | 15/p A |
| D. | 25/p A |
| Answer» B. 5/p A | |
| 2. |
What is the value of the form factor for sinusoidal current? |
| A. | p/2 |
| B. | p/4 |
| C. | 2p |
| D. | p/v2 |
| Answer» B. p/4 | |
| 3. |
Average value of current over a full cycle is? |
| A. | 0.67Im |
| B. | 0 |
| C. | 6.7Im |
| D. | 3.3Im |
| Answer» C. 6.7Im | |
| 4. |
For a direct current, the rms voltage is ________ the mean voltage. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | Not related to |
| Answer» D. Not related to | |
| 5. |
If maximum value of current is 5v2 A, what will be the value of RMS current? |
| A. | 10 A |
| B. | 5 A |
| C. | 15 A |
| D. | 25 A |
| Answer» C. 15 A | |
| 6. |
The time axis of an AC phasor represents? |
| A. | Time |
| B. | Phase angle |
| C. | Voltage |
| D. | Current |
| Answer» C. Voltage | |
| 7. |
A phasor has frozen at 30 degrees, find the value of the phase angle. |
| A. | 30 degrees |
| B. | 60 degrees |
| C. | 120 degrees |
| D. | 180 degrees |
| Answer» B. 60 degrees | |
| 8. |
What is the correct expression of ?? |
| A. | ?=2p |
| B. | ?=2pf |
| C. | ?=pf |
| D. | ?=2f2 |
| Answer» C. ?=pf | |
| 9. |
Find the value of ? if the frequency is 5Hz? |
| A. | 3.14 rad/s |
| B. | 31.4 rad/s |
| C. | 34 rad/s |
| D. | 341 rad/s |
| Answer» C. 34 rad/s | |
| 10. |
The length of the phasor represents? |
| A. | Magnitude of the quantity |
| B. | Direction of the quantity |
| C. | Neither magnitude nor direction |
| D. | Either magnitude or direction |
| Answer» B. Direction of the quantity | |
| 11. |
Calculate the number of paired poles if the frequency id 15kHz and the number of revolutions is 300. |
| A. | 10 |
| B. | 30 |
| C. | 50 |
| D. | 70 |
| Answer» D. 70 | |
| 12. |
What is the frequency of a two pole machine having n=50? |
| A. | 100Hz |
| B. | 200Hz |
| C. | 50Hz |
| D. | 25Hz |
| Answer» D. 25Hz | |
| 13. |
What is the minimum number of poles that a machine must have __________ |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 10 |
| Answer» C. 4 | |
| 14. |
The waveform of the emf generated undergoes one complete cycle when? |
| A. | Conductors move past north pole |
| B. | Conductors move past south pole |
| C. | Conductors move past north and south poles |
| D. | Conductors are stationary |
| Answer» D. Conductors are stationary | |
| 15. |
For a rectangular wave, average current is ______ rms current. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | Not related |
| Answer» D. Not related | |
| 16. |
Calculate the crest factor if the peak value of current is 10A and the rms value is 2A. |
| A. | 5 |
| B. | 10 |
| C. | 5A |
| D. | 10A |
| Answer» B. 10 | |
| 17. |
Peak value divided by the rms value gives us? |
| A. | Peak factor |
| B. | Crest factor |
| C. | Both peak and crest factor |
| D. | Neither peak nor crest factor |
| Answer» D. Neither peak nor crest factor | |
| 18. |
If the peak to peak voltage is 10V, calculate the peak voltage. |
| A. | 10V |
| B. | 2V |
| C. | 4V |
| D. | 5V |
| Answer» E. | |
| 19. |
What is the correct relation between the peak value and peak to peak value for a sinusoidal waveform? |
| A. | Vp=4Vp-p |
| B. | Vp=Vp-p |
| C. | Vp-p=2Vp |
| D. | Vp=2Vp-p |
| Answer» D. Vp=2Vp-p | |
| 20. |
If the peak voltage is 9V, calculate the peak to peak voltage. |
| A. | 9V |
| B. | 20V |
| C. | 18V |
| D. | 12V |
| Answer» D. 12V | |
| 21. |
emf is zero if the angle between velocity and length is _____ |
| A. | 0 |
| B. | 900 |
| C. | 2700 |
| D. | 450 |
| Answer» B. 900 | |
| 22. |
The instantaneous values of two alternating voltages are given as:v1=60sin? and v2=40sin(? - p/3). Find the instantaneous difference. |
| A. | 53 sin(71.5°) V |
| B. | 53 sin( 79..5°) V |
| C. | 53 sin(26.5°) V |
| D. | 53 cos(36.5°) V |
| Answer» C. 53 sin(26.5°) V | |
| 23. |
The instantaneous values of two alternating voltages are given as _________v1=60sin? and v2=40sin(? - p/3). Find the instantaneous sum. |
| A. | 87.2 sin(36.5°) V |
| B. | 87.2 sin( 0.5°) V |
| C. | 87.2 sin(26.5°) V |
| D. | 87.2 cos(36.5°) V |
| Answer» B. 87.2 sin( 0.5°) V | |
| 24. |
Ammeters and voltmeters are calibrated to read? |
| A. | RMS value |
| B. | Peak value |
| C. | Average value |
| D. | Instantaneous value |
| Answer» B. Peak value | |
| 25. |
The resultant of two alternating sinusoidal voltages or currents can be found using ___________ |
| A. | Triangular law |
| B. | Parallelogram law |
| C. | Either triangular or parallelogram law |
| D. | Neither triangular nor parallelogram law |
| Answer» C. Either triangular or parallelogram law | |
| 26. |
If two current phasors, having magnitude 12A and 5A intersect at an angle of 90 degrees, calculate the resultant current. |
| A. | 13 A |
| B. | 10 A |
| C. | 6 A |
| D. | 5 A |
| Answer» B. 10 A | |
| 27. |
If the phasors are drawn to represent the maximum values instead of the rms values, what would happen to the phase angle between quantities? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» D. Becomes zero | |