MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A shunt generator has an induced voltage on open circuit of 127 V. When the machine is on load the terminal voltage is 120 V. The load current if the field resistance be 15 ohm and armature resistance be 15 ohm. |
| A. | 342 A |
| B. | 350 A |
| C. | 358 A |
| D. | 8 A |
| Answer» B. 350 A | |
| 2. |
If the DC machine is held constant at 3000 rpm. The DC voltage is 250V. If the field is held constant with 250V. Is this machine generator or motor? |
| A. | Motor |
| B. | Generator |
| C. | None of the mentioned |
| D. | Any of the mentioned |
| Answer» B. Generator | |
| 3. |
Consider a 200V, 25kW, 30A DC machine lap connected with armature resistance of 0.4 ohms. If the machine is later wave wound, then the developed power is? |
| A. | 25 kW |
| B. | 12.5 kW |
| C. | 20 kW |
| D. | 50 kW |
| Answer» B. 12.5 kW | |
| 4. |
If the armature terminal voltage is more that its induced EMF, the DC machine given is ________ |
| A. | motoring mode |
| B. | generating mode |
| C. | regenerative mode |
| D. | none of the mentioned |
| Answer» B. generating mode | |
| 5. |
What is the shaft power at the DC Generator? |
| A. | sum of mechanical power and rotational losses |
| B. | only mechanical losses |
| C. | no-load losses and mechanical power |
| D. | any of the mentioned |
| Answer» B. only mechanical losses | |
| 6. |
If the terminal voltage of 220-V dc generator having armature resistance of 1 ohms. The induced emf produced is 200-V. The armature current for the above machine is? |
| A. | 20 A |
| B. | -20 A |
| C. | -10 A |
| D. | 10 A |
| Answer» B. -20 A | |
| 7. |
The circuit depicting the equation V=Ea I*Ra. |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1d.png"><img alt="The circuit depicting the equation V=Ea + I*Ra - option d" class="alignnone size-full wp-image-160802" height="228" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1d.png" width="239"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1c.png"><img alt="The circuit depicting the equation V=Ea + I*Ra - option c" class="alignnone size-full wp-image-160801" height="211" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1c.png" width="257"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1b.png"><img alt="The circuit depicting the equation V=Ea + I*Ra - option b" class="alignnone size-full wp-image-160800" height="208" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1b.png" width="223"/></a> |
| D. | None of the mentioned |
| Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1c.png"><img alt="The circuit depicting the equation V=Ea + I*Ra - option c" class="alignnone size-full wp-image-160801" height="211" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1c.png" width="257"/></a> | |
| 8. |
The circuit depicting the equation V=Ea + I*Ra. |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1a.png"><img alt="The circuit depicting the equation V=Ea + I*Ra - option a" class="alignnone size-full wp-image-160799" height="216" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1a.png" width="232"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1b.png"><img alt="The circuit depicting the equation V=Ea + I*Ra - option b" class="alignnone size-full wp-image-160800" height="208" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1b.png" width="223"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1c.png"><img alt="The circuit depicting the equation V=Ea + I*Ra - option c" class="alignnone size-full wp-image-160801" height="211" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1c.png" width="257"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1d.png"><img alt="The circuit depicting the equation V=Ea + I*Ra - option d" class="alignnone size-full wp-image-160802" height="228" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1d.png" width="239"/></a> |
| Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1b.png"><img alt="The circuit depicting the equation V=Ea + I*Ra - option b" class="alignnone size-full wp-image-160800" height="208" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-circuit-model-q1b.png" width="223"/></a> | |