MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following loss in a D.C. generator is dissipated in the form of heat? |
| A. | Mechanical loss |
| B. | Core loss |
| C. | Copper loss |
| D. | All of the above |
| Answer» E. | |
| 2. |
In a D.C. generator, the iron losses mainly take place in___________/ |
| A. | Yoke |
| B. | Commutator |
| C. | Armature conductors |
| D. | Armature rotor |
| Answer» E. | |
| 3. |
Hopkinson s test on D.C. machines is conducted at_______________? |
| A. | No-load |
| B. | Part load |
| C. | Full-load |
| D. | Overload |
| Answer» D. Overload | |
| 4. |
Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads? |
| A. | Series motor |
| B. | Shunt motor |
| C. | Cumulatively compounded motor |
| D. | Differentially compounded motor |
| Answer» D. Differentially compounded motor | |
| 5. |
What will happen if the back e.m.f. of a D.C. motor vanishes suddenly? |
| A. | The motor will stop |
| B. | The motor will continue to run |
| C. | The armature may burn |
| D. | The motor will run noisy |
| Answer» D. The motor will run noisy | |
| 6. |
Sparking at the commutator of a D.C. motor may result in____________? |
| A. | Damage to commutator segments |
| B. | Damage to commutator insulation |
| C. | Increased power consumption |
| D. | All of the above |
| Answer» E. | |
| 7. |
If a D.C. motor designed for 40 C ambient temperature is to be used for 50 C ambient temperature, then the motor_____________? |
| A. | Of lower H.P. should be selected |
| B. | Of higher H.P. should be selected |
| C. | Can be used for 50 C ambient temperature also |
| D. | Is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor |
| Answer» E. | |
| 8. |
Which of the following motors is most suitable for signalling devices and many kinds of timers ? |
| A. | D.C. shunt motor |
| B. | D.C. series motor |
| C. | Induction motor |
| D. | Reluctance motor |
| Answer» E. | |
| 9. |
Sparking, is discouraged in a D.C. motor because_____________? |
| A. | It increases the input power con-sumption |
| B. | Commutator gets damaged |
| C. | Both A. and B. |
| D. | None of the above |
| Answer» C. Both A. and B. | |
| 10. |
Speed control by Ward Leonard method gives uniform speed variation_____________? |
| A. | In one direction |
| B. | In both directions |
| C. | Below normal speed only |
| D. | Above normal speed only |
| Answer» C. Below normal speed only | |
| 11. |
Which motor has the poorest speed control? |
| A. | Differentially compounded motor |
| B. | Cumulatively compounded motor |
| C. | Shunt motor |
| D. | Series motor |
| Answer» E. | |
| 12. |
By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor? |
| A. | Frame |
| B. | Shaft |
| C. | Commutator |
| D. | Stator |
| Answer» D. Stator | |
| 13. |
In which of the following applications D.C. series motor is invariably tried? |
| A. | Starter for a car |
| B. | Drive for a water pump |
| C. | Fan motor |
| D. | Motor operation in A.C. or D.C |
| Answer» B. Drive for a water pump | |
| 14. |
According to Fleming s left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of_________________? |
| A. | Current in the conductor aovtaat of conductor |
| B. | Resultant force on conductor |
| C. | None of the above |
| D. | None of the above |
| Answer» B. Resultant force on conductor | |
| 15. |
Starters are used with D.C. motors because______________? |
| A. | These motors have high starting torque |
| B. | These motors are not self-starting |
| C. | Back e.m.f. of these motors is zero initially |
| D. | To restrict armature current as there is no back e.m.f. while starting |
| Answer» E. | |