MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
External characteristics for all separately DC generators (except series generator) can be summarized as ____________ |
| A. | Parabola opening in +x direction |
| B. | Parabola opening in -x direction |
| C. | Parabola opening in +y direction |
| D. | Parabola opening in -y direction |
| Answer» C. Parabola opening in +y direction | |
| 2. |
External Characteristic is a plot of _____________ |
| A. | Generated emf and load current |
| B. | Terminal voltage and load current |
| C. | Generated voltage and field current |
| D. | Armature current and field current |
| Answer» C. Generated voltage and field current | |
| 3. |
Which of the following is the correct formula for cumulative compound generator? |
| A. | N<sub>se</sub>= N<sub>f</sub> ( I<sub>a</sub>/I<sub>f</sub>) |
| B. | N<sub>se</sub>= N<sub>f</sub> ( I<sub>f</sub>/I<sub>a</sub>) |
| C. | N<sub>se</sub>= 2N<sub>f</sub> ( I<sub>a</sub>/I<sub>f</sub>) |
| D. | N<sub>se</sub>= N<sub>f</sub> ( I<sub>a</sub>/I<sub>f</sub>)/2 |
| Answer» C. N<sub>se</sub>= 2N<sub>f</sub> ( I<sub>a</sub>/I<sub>f</sub>) | |
| 4. |
At some point If On OCC, the value of voltage obtained which is more than rated voltage is _______ |
| A. | I<sub>a</sub> *R<sub>a</sub> + I<sub>f</sub> *R<sub>f</sub> |
| B. | I<sub>a</sub> *R<sub>a</sub> |
| C. | V<sub>d</sub> + I<sub>a</sub> *R<sub>a</sub> |
| D. | Can t tell |
| Answer» D. Can t tell | |
| 5. |
In armature characteristic, nature of If at lower values of armature current is ______ |
| A. | Very large |
| B. | Almost constant |
| C. | Decreasing rapidly |
| D. | Increasing then decreasing |
| Answer» C. Decreasing rapidly | |
| 6. |
what is the first step in drawing the armature characteristic? |
| A. | I<sub>f</sub> is made 0 |
| B. | Field current is adjusted to give Voc equal to rated value |
| C. | Switch connecting armature circuit with external circuit is made open |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 7. |
3.Armature characteristic is drawn across ________ |
| A. | I<sub>a</sub> vs I<sub>f</sub> |
| B. | I<sub>a</sub> vs V<sub>t</sub> |
| C. | I<sub>f</sub> vs V<sub>t</sub> |
| D. | E<sub>a</sub> vs I<sub>a</sub> |
| Answer» B. I<sub>a</sub> vs V<sub>t</sub> | |
| 8. |
External characteristics is drawn with constant term/s ____________ |
| A. | Field current |
| B. | Speed |
| C. | Both Field current and Speed |
| D. | Load |
| Answer» D. Load | |
| 9. |
Armature characteristic is _____________ |
| A. | No-load characteristic |
| B. | Load characteristic |
| C. | OCC Current |
| D. | Cannot be determined |
| Answer» C. OCC Current | |