MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The power in an AC circuit contains an inductor of 30 mH, a capacitor of 300 F, a resistor of 70 , and an AC source of 24 V, 60 Hz. Calculate the energy dissipated in the circuit in 1000 s. |
| A. | 8.22 J |
| B. | 8.22 10<sup>2</sup> J |
| C. | 8.22 10<sup>3</sup> J |
| D. | 82.2 10<sup>3</sup> J |
| Answer» D. 82.2 10<sup>3</sup> J | |
| 2. |
What is the power factor for a series LCR circuit at resonance? |
| A. | Infinity |
| B. | -1 |
| C. | 0 |
| D. | 1 |
| Answer» E. | |
| 3. |
Power factor has a unit of Watts. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
What is the power factor in a pure inductive or capacitive circuit? |
| A. | -1 |
| B. | 0 |
| C. | 1 |
| D. | Infinity |
| Answer» C. 1 | |
| 5. |
What is the power factor in a pure resistive circuit? |
| A. | 0 |
| B. | -1 |
| C. | Infinity |
| D. | 1 |
| Answer» E. | |
| 6. |
Which of the following is true about power factor? |
| A. | sin u2061 = ( frac {True , power}{Apparent , power} ) |
| B. | cos = ( frac {True , power}{Apparent , power} ) |
| C. | sin u2061 = ( frac {Apparent , power}{True , power} ) |
| D. | cos = ( frac {Apparent , power}{True , power} ) |
| Answer» C. sin u2061 = ( frac {Apparent , power}{True , power} ) | |
| 7. |
Apparent power is also known virtual power. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Identify the expression for average power. |
| A. | P<sub>av</sub>= ( frac {V_o I_o}{2} )sin |
| B. | P<sub>av</sub>= ( frac {V_o I_o}{2} )cos |
| C. | P<sub>av</sub>= ( frac {V_o I_o}{4} )cos u2061 |
| D. | P<sub>av</sub>=2V<sub>o</sub>I<sub>o</sub>sin u2061 |
| Answer» C. P<sub>av</sub>= ( frac {V_o I_o}{4} )cos u2061 | |
| 9. |
Which among the following varies in both magnitude and sign over a cycle? |
| A. | Apparent power |
| B. | Effective power |
| C. | Instantaneous power |
| D. | Average power |
| Answer» D. Average power | |
| 10. |
How many types of power can be defined in an AC circuit? |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 5 |
| Answer» B. 2 | |