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. |
For a DC motor taking 10kW power from 230V mains, having armature resistance and field resistance equal to 0.08 and 115 resp. The value of armature current is_____ |
| A. | 45.68 A |
| B. | 43.48 a |
| C. | 41.48 A |
| D. | Data insufficient |
| Answer» D. Data insufficient | |
| 2. |
What is the armature current for a DC generator if terminal voltage is observed to be 245V and open circuit voltage is equal to 250V, where armature resistance is 0.05 ? |
| A. | 10A |
| B. | 100A |
| C. | 1KA |
| D. | 1A |
| Answer» C. 1KA | |
| 3. |
For a DC generator feeding 100kW power into 230V mains, having armature resistance and field resistance equal to 0.08 and 115 resp. The value of armature current is_____ |
| A. | 436.8 A |
| B. | 434.8 a |
| C. | 432.8 A |
| D. | Data insufficient |
| Answer» B. 434.8 a | |
| 4. |
What is the armature current for a DC motor if terminal voltage is 255V and open circuit voltage is equal to 250V, where armature resistance is 0.05 ? |
| A. | 10A |
| B. | 100A |
| C. | 1KA |
| D. | 1A |
| Answer» C. 1KA | |
| 5. |
When torque of the electromagnetic origin is in the direction of rotation of armature, machine is said to be operating in which of the following mode? |
| A. | Depends on other parameters |
| B. | Generating |
| C. | Motoring |
| D. | Inducing |
| Answer» D. Inducing | |
| 6. |
When Ea<Vt machine is said to be operating in which of the following mode? |
| A. | Depends on the Shaft speed |
| B. | Generating |
| C. | Motoring |
| D. | Inducing |
| Answer» D. Inducing | |
| 7. |
4.When Ea>Vt machine is said to be operating in which of the following mode? |
| A. | Depends on the Shaft speed |
| B. | Generating |
| C. | Motoring |
| D. | Inducing |
| Answer» C. Motoring | |
| 8. |
A 4-pole Dc wound machine is lap wound with 400 conductors. The pole shore is 20 cm long and average flux density over one-pole pitch is 0.4 T, the armature diameter being 30 cm. Here, motor is drawing 25 A current at 1500 rpm.What is the available torque (N-m) at shaft? |
| A. | 29.9 |
| B. | 59.8 |
| C. | 14.95 |
| D. | 44.85 |
| Answer» B. 59.8 | |
| 9. |
Product of torque and mechanical angular velocity is_____ |
| A. | Ea/ |
| B. | Ea*Ia |
| C. | /Ea |
| D. | Can t tell |
| Answer» C. /Ea | |