MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
Which type of ac waveform is given in figure? |
| A. | sinusoidal |
| B. | triangular |
| C. | square |
| D. | complex waveform |
| Answer» B. triangular | |
| 2. |
What is not a frequency for ac current? |
| A. | 50 Hz |
| B. | 55 Hz |
| C. | 0Hz |
| D. | 60 Hz |
| Answer» D. 60 Hz | |
| 3. |
Which of the following is not ac waveform? |
| A. | sinusoidal |
| B. | square |
| C. | constant |
| D. | triangular |
| Answer» D. triangular | |
| 4. |
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 | |
| 5. |
When is tanφ positive? |
| 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» C. When inductive reactance is equal to capacitive reactance | |
| 6. |
When is current in phase with the voltage? |
| A. | When XL>XC |
| B. | When XL<XC |
| C. | When XL=XC |
| D. | When XC=infinity |
| Answer» D. When XC=infinity | |
| 7. |
When is tanφ positive?$ |
| 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 | |
| 8. |
What is the correct expression for the phase angle in an RLC series circuit? |
| A. | φ=tan<sup>-1</sup>(XL-XC)/R |
| B. | φ=tan<sup>-1</sup> (XL+XC)/R |
| C. | φ=tan(XL-XC)/R |
| D. | φ=tan<sup>-1</sup> (XL-XC) |
| Answer» B. ‚âà√¨‚àö√∫=tan<sup>-1</sup> (XL+XC)/R | |
| 9. |
In an RLC series phasor, we start drawing the phasor from which quantity? |
| A. | Voltage |
| B. | Resistance |
| C. | Impedance |
| D. | Current |
| Answer» E. | |
| 10. |
In an RLC circuit, the power factor is always ____________ |
| A. | Positive |
| B. | Negative |
| C. | Depends on the circuit |
| D. | Zero |
| Answer» D. Zero | |
| 11. |
In an RLC circuit, which of the following is always used as a vector reference? |
| A. | Voltage |
| B. | Resistance |
| C. | Impedance |
| D. | Current |
| Answer» B. Resistance | |
| 12. |
Find the total voltage applied in a series RLC circuit when i=3mA, VL=30V, VC=18V and R=1000 ohms. |
| A. | 3.95V |
| B. | 51V |
| C. | 32.67V |
| D. | 6.67V |
| Answer» C. 32.67V | |