Measurement of Electrical Quantities (Voltage, Current, Power) — MCQs – EE

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1. What is the primary function of an ammeter?



2. What does a voltmeter measure?



3. An ammeter is always connected in:



4. A voltmeter is connected in:



5. The internal resistance of an ideal ammeter is:



6. The internal resistance of an ideal voltmeter is:



7. The unit of electrical power is:



8. A wattmeter is used to measure:



9. A watt-hour meter measures:



10. The moving coil in a PMMC instrument carries:



11. The deflection in a PMMC instrument is proportional to:



12. An electrodynamometer type wattmeter can measure:



13. A moving iron instrument works on the principle of:



14. In a dynamometer type wattmeter, the fixed coil carries:



15. In an electrodynamometer wattmeter, the moving coil carries:



16. A shunt resistor is used with an ammeter to:



17. A multiplier resistor is used with a voltmeter to:



18. The torque in a moving coil instrument is produced by:



19. The damping in a PMMC instrument is usually provided by:



20. The controlling torque in an indicating instrument is provided by:



21. A true RMS voltmeter measures:



22. A digital multimeter (DMM) can measure:



23. In an AC circuit, the wattmeter reading gives:



24. The power factor of a circuit is given by:



25. In a balanced three-phase system, total power is measured using:



26. If both wattmeters in a two-wattmeter method show equal readings, the power factor is:



27. In the two-wattmeter method, one wattmeter reads negative when:



28. The Creeping error in an energy meter is caused by:



29. The braking torque in an induction-type energy meter is produced by:



30. The speed of the disc in an energy meter is proportional to:



31. A CT (Current Transformer) is used for:



32. A PT (Potential Transformer) is used for:



33. The burden of an instrument transformer refers to:



34. The ratio error in a current transformer is caused by:



35. Phase angle error in instrument transformers affects:



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