McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 201. |
HVDC transmission has as compared to HVAC transmission. |
| A. | smaller transformer size |
| B. | smaller conductor size |
| C. | higher corona loss |
| D. | smaller power transfer capabilities |
| Answer» B. smaller conductor size | |
| Explanation: the conductor size is smaller as there is no sink effect, and the whole conductor is utilized for transmitting power. | |
| 202. |
The negative polarity is used in the monopolar link because it |
| A. | uses less conductor size |
| B. | is safer |
| C. | produces less radio interference |
| D. | has less resistance |
| Answer» C. produces less radio interference | |
| Explanation: the monopolar link uses just a single conductor, which is usually negative as it produces less radio interference and corona. | |
| 203. |
Which of the following can be a source of supply in dc power supplies? |
| A. | battery |
| B. | dry cell |
| C. | full wave rectifier |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: source of supply will be a battery, dry cell or full wave rectifier etc. | |
| 204. |
Which of the application’s filters used for? |
| A. | reducing ripples |
| B. | increasing ripples |
| C. | increasing phase change |
| D. | increasing amplitude |
| Answer» A. reducing ripples | |
| Explanation: ripples are ac components and filters are used for eliminating ac components from a signal. | |
| 205. |
Which of the following represent a change of output voltage when load current is increased? |
| A. | line regulation |
| B. | load regulation |
| C. | current regulation |
| D. | voltage regulation |
| Answer» B. load regulation | |
| Explanation: load regulation is the process of fractional change of output voltage when load current is increased from zero to maximum value. | |
| 206. |
Which of the following generate output voltage much closer to true value? |
| A. | true generator |
| B. | precision generator |
| C. | output generator |
| D. | accurate generator |
| Answer» B. precision generator | |
| Explanation: precision generators are one which generates output voltage much closer to the true value. | |
| 207. |
Why zener diodes are provided in dc supply? |
| A. | for forward conduction |
| B. | for reverse conduction |
| C. | for reference voltage |
| D. | for increasing amplitude |
| Answer» C. for reference voltage | |
| Explanation: zener diodes in dc power supplies are used for providing a reference voltage used for comparison. | |
| 208. |
Stability of output voltage is entirely depended on |
| A. | stability of transformer |
| B. | stability of zener diode |
| C. | quality of wires |
| D. | capacitor values |
| Answer» B. stability of zener diode | |
| Explanation: stability of zener diodes used is an important factor in determining the stability of output voltage in dc power supply. | |
| 209. |
For excellent stability, the zener diode is kept in temperature controlled casket. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: zener diode is kept on temperature controlled casket due to its low temperature coefficient which may lead to less stability. | |
| 210. |
For instrumentation system, precision variable voltage-reference system is necessary. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: precision variable voltage reference system is used for comparing voltage with a reference voltage and can be used in the instrumentation system. | |
| 211. |
Which of the following can be used as a comparator? |
| A. | zener diode |
| B. | diode |
| C. | operational amplifier |
| D. | all of the mentioned |
| Answer» C. operational amplifier | |
| Explanation: operational amplifier can be used as a comparator circuit. | |
| 212. |
Which of the following are not the standard value of Zener diodes? |
| A. | 5.1 v |
| B. | 5.6 v |
| C. | 5.8v |
| D. | 6.2v |
| Answer» C. 5.8v | |
| Explanation: standard values of zener voltages are 5.1v, 5.6v, 6.2v and 9.1v etc. | |
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