MCQOPTIONS
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MCQOPTIONS
This section includes 7 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. |
In DC machines the residual magnetism is present. The order of residual magnetism is ___________ |
| A. | 2 to 3 per cent |
| B. | 10 to 15 per cent |
| C. | 20 to 25 per cent |
| D. | 50 to 75 per cent |
| Answer» B. 10 to 15 per cent | |
| 2. |
The armature shaft of a DC motor must be able to withstand ______________ |
| A. | Bending moment due to weight of the armature. |
| B. | Any unbalanced magnetic pull on the armature core. |
| C. | Twisting stains due to transmission of torque. |
| D. | Bending moment, unbalanced magnetic pull and twisting stains |
| Answer» E. | |
| 3. |
Which of the following quantity will decrease if supply voltage is increased? |
| A. | Starting torque |
| B. | Operating speed |
| C. | Full-load current |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 4. |
An electric motor is having constant output power. So, motor will have a torque speed characteristic _______________________ |
| A. | Circle about the origin. |
| B. | Straight line parallel to the speed axis. |
| C. | Straight line through the origin. |
| D. | Rectangular hyperbola |
| Answer» E. | |
| 5. |
The current drawn by the armature of DC motor is directly proportional to ________________ |
| A. | Torque |
| B. | Speed |
| C. | The voltage across the terminals |
| D. | Cannot be determined |
| Answer» B. Speed | |
| 6. |
Direction of rotation of motor is determined by ____________ |
| A. | Faraday’s law |
| B. | Lenz’s law |
| C. | Coulomb’s law |
| D. | Fleming’s left-hand rule |
| Answer» E. | |
| 7. |
Which part will surely tell that given motor is DC motor and not an AC type? |
| A. | Winding |
| B. | Shaft |
| C. | Commutator |
| D. | Stator |
| Answer» D. Stator | |