MCQOPTIONS
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MCQOPTIONS
This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Dc Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For a given DC series generator with critical resistance equal to 100 , armature resistance is equal to 50 , and series field resistance is equal to 20 , is connected across load of 50 . What will be the load voltage? |
| A. | 20 kV |
| B. | 0 V |
| C. | 2 kV |
| D. | Data insufficient |
| Answer» C. 2 kV | |
| 2. |
For a DC series generator what is the condition for self-excitation? |
| A. | (R<sub>a</sub>+R<sub>se</sub>) > RC |
| B. | (R<sub>SE</sub>+R<sub>se</sub>+R<sub>L</sub>) < R<sub>C</sub> |
| C. | (R<sub>SE</sub>+R<sub>se</sub>+R<sub>L</sub>) > R<sub>C</sub> |
| D. | (R<sub>se</sub>+R<sub>L</sub>) > R<sub>C</sub> |
| Answer» D. (R<sub>se</sub>+R<sub>L</sub>) > R<sub>C</sub> | |
| 3. |
For series DC generator, internal/external characteristic start from ____________ |
| A. | Positive non-zero voltage |
| B. | Zero voltage |
| C. | Negative non-zero voltage |
| D. | Can start from anywhere |
| Answer» C. Negative non-zero voltage | |
| 4. |
External characteristic differ from internal characteristic in DC series motor by ______ |
| A. | I<sub>a</sub> *(R<sub>a</sub> + R<sub>SE</sub>) |
| B. | I<sub>a</sub> *R<sub>a</sub> |
| C. | I<sub>a</sub> *R<sub>SE</sub> |
| D. | If *R<sub>SE</sub> |
| Answer» B. I<sub>a</sub> *R<sub>a</sub> | |
| 5. |
7.How compounding level in a compound machine is adjusted? |
| A. | By adding variable resistance in series with series field resistance |
| B. | By adding variable resistance in parallel with series field resistance |
| C. | By adding fixed resistance in parallel with series field resistance |
| D. | By adding fixed resistance in series with series field resistance |
| Answer» C. By adding fixed resistance in parallel with series field resistance | |
| 6. |
Characteristics of separately excited DC generator are drawn by keeping _____ |
| A. | Field current and speed both constant |
| B. | Field current and speed both variable |
| C. | Field current constant and speed variable |
| D. | Field current variable and speed constant |
| Answer» C. Field current constant and speed variable | |