MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
At θ=π/2, positive portion is __________ negative portion in power cycle. |
| A. | greater than |
| B. | less than |
| C. | equal to |
| D. | greater than or equal to |
| Answer» D. greater than or equal to | |
| 2. |
The average value of power if θ=0⁰ is? |
| A. | VmIm/2 |
| B. | VmIm/2 |
| C. | VmIm/4 |
| D. | VmIm/8 |
| Answer» C. VmIm/4 | |
| 3. |
In P (t) equation, if θ=0, then P (t) =? |
| A. | (VmIm/2)(1+cosωt) |
| B. | (VmIm/2)(cosωt) |
| C. | (VmIm/2)(cos2ωt) |
| D. | (VmIm)(1+cos2ωt) |
| Answer» E. | |
| 4. |
THE_AVERAGE_VALUE_OF_POWER_IF_‚ÂÀ√≠‚ÄÖ√†√®=0‚ÄÖ√Ñ√∂‚ÀÖ√Ñ‚ÄÖ√†√ª_IS??$# |
| A. | V<sub>m</sub>I<sub>m</sub>/2 |
| B. | V<sub>m</sub>I<sub>m</sub>/2 |
| C. | V<sub>m</sub>I<sub>m</sub>/4 |
| D. | V<sub>m</sub>I<sub>m</sub>/8 |
| Answer» C. V<sub>m</sub>I<sub>m</sub>/4 | |
| 5. |
At_θ=π/2,_positive_portion_is____________negative_portion_in_power_cycle.$# |
| A. | greater than |
| B. | less than |
| C. | equal to |
| D. | greater than or equal to |
| Answer» D. greater than or equal to | |
| 6. |
In P (t) equation, if θ=0, then P (t) =?# |
| A. | (V<sub>m</sub>I<sub>m</sub>/2)(1+cos⁡ωt) |
| B. | (V<sub>m</sub>I<sub>m</sub>/2)(cos⁡ωt) |
| C. | (V<sub>m</sub>I<sub>m</sub>/2)(cos⁡2ωt) |
| D. | (V<sub>m</sub>I<sub>m</sub>)(1+cos⁡2ωt) |
| Answer» E. | |
| 7. |
Instantaneous power is negative, when the polarities of voltage and current are of __________ |
| A. | opposite sign |
| B. | same sign |
| C. | voltage is zero |
| D. | current is zero |
| Answer» B. same sign | |
| 8. |
The time varying part in the equation of instantaneous power has frequency ________________ that of the frequency of voltage or current wave forms. |
| A. | equal to |
| B. | twice |
| C. | thrice |
| D. | four times |
| Answer» C. thrice | |
| 9. |
The equation of instantaneous power is? |
| A. | P (t) = (V<sub>m</sub>I<sub>m</sub>/2)(cos⁡(2ωt+θ)+sin⁡θ) |
| B. | P (t) = (V<sub>m</sub>I<sub>m</sub>/2)(sin⁡(2ωt+θ)+cos⁡θ) |
| C. | P (t) = (V<sub>m</sub>I<sub>m</sub>/2)(cos⁡(2ωt+θ)+cos⁡θ) |
| D. | P (t) = (V<sub>m</sub>I<sub>m</sub>/2)(sin⁡(2ωt+θ)+sin⁡θ) |
| Answer» D. P (t) = (V<sub>m</sub>I<sub>m</sub>/2)(sin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(2‚âà√¨‚àö¬¢t+‚âà√≠‚Äö√†√®)+sin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû‚âà√≠‚Äö√†√®) | |
| 10. |
If there is complex impedance in a circuit, part of energy is ____________ by reactive part and part of its energy is ____________ by the resistance. |
| A. | alternately stored and returned, alternately stored and returned |
| B. | alternately stored and returned, dissipated |
| C. | dissipated, alternately stored and returned |
| D. | dissipated, dissipated |
| Answer» C. dissipated, alternately stored and returned | |
| 11. |
In capacitor, the energy delivered by source is ____________ by capacitor. |
| A. | returned to source |
| B. | dissipated in the form of heat |
| C. | stored as electric field |
| D. | stored as magnetic field |
| Answer» D. stored as magnetic field | |
| 12. |
In inductor, the energy delivered by source is ____________ by inductor. |
| A. | stored as magnetic field |
| B. | dissipated in the form of heat |
| C. | returned to source |
| D. | stored as electric field |
| Answer» B. dissipated in the form of heat | |
| 13. |
In purely resistive circuit, energy delivered by source is ____________ by resistance. |
| A. | dissipated in the form of heat |
| B. | stored as electric field |
| C. | stored as magnetic field |
| D. | returned to source |
| Answer» B. stored as electric field | |