MCQOPTIONS
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MCQOPTIONS
This section includes 11 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. |
The trigonometric Fourier series for a complex wave will contain positive cosine terms only when |
| A. | it contains even harmonics |
| B. | its two half-cycles are symmetrical |
| C. | its value is zero at 0= n/2, 3n/2 etc. |
| D. | its value is zero at 0= n, 2n etc. |
| Answer» D. its value is zero at 0= n, 2n etc. | |
| 2. |
The transients which are produced due to sudden but energetic changes from one steady state of a circuit to another are called transients. |
| A. | initiation |
| B. | transition |
| C. | relaxation |
| D. | subsidence |
| Answer» C. relaxation | |
| 3. |
The transient current in a loss-free L-C circuit when excited from an ac source is a/an sine wave. |
| A. | over-damped |
| B. | undamped |
| C. | under-damped |
| D. | critically damped |
| Answer» C. under-damped | |
| 4. |
For measuring positive, negative and zero sequence voltages in a system, the reference is taken as : |
| A. | Neutral of the system only |
| B. | Ground only |
| C. | For zero sequence neutral and for positive and negative the ground |
| D. | None of the above |
| Answer» E. | |
| 5. |
The in-rush current of a transformer at no load is maximum if the supply voltage is switched on |
| A. | At zero voltage value |
| B. | At peak voltage value |
| C. | At V/2 value |
| D. | At ,6 /2V value |
| Answer» B. At peak voltage value | |
| 6. |
The principal information obtained from load flow studies in a power system are1. magnitude and phase angle of the voltage at each bus.2. reactive and real power flows in each of lines.3. total power loss in the network.4. Transient stability limit of the system Select the correct answer from the codes given below : |
| A. | I and 2 |
| B. | 3 and 4 |
| C. | 1,2 and 3 |
| D. | 2 and 4 |
| Answer» D. 2 and 4 | |
| 7. |
Earth wire on EHV overhead transmission line is provided to protect the line against |
| A. | lightning surge |
| B. | switching surge |
| C. | excessive fault voltages |
| D. | corona effect |
| Answer» B. switching surge | |
| 8. |
During normal operation, the UPS takes its power from the supply, rectifies the ac voltage to dc and inverts it again to ac with the |
| A. | same frequency and rms value |
| B. | Different frequency and rms value |
| C. | same frequency and different rms value |
| D. | Different frequency and same rms value |
| Answer» B. Different frequency and rms value | |
| 9. |
Lightening and Tree striking on a live conductor is an example________ Power Quality issue. |
| A. | Voltage Sag |
| B. | Voltage Swell |
| C. | Interruption |
| D. | Surge |
| Answer» C. Interruption | |
| 10. |
Consider the following statements : The transient stability of the power system under unbalanced fault conditions can be effectively improved by1. Excitation control2. phase-shifting transformer3. single-pole switching of circuit breakers4. increasing the turbine input. Of these statements |
| A. | 1 and 2 are correct |
| B. | 2 and 3 are correct |
| C. | 3 and 4 are correct |
| D. | 1 and 3 are correct |
| Answer» D. 1 and 3 are correct | |
| 11. |
To obtain a constant current input, a inductor is placed in current source inductor (CSI) in: |
| A. | Parallel |
| B. | Series |
| C. | Both Series and Parallel |
| D. | Not placed at all |
| Answer» C. Both Series and Parallel | |