Electrical Measuring Instruments | Practice MCQs Physics for Mdcat | mosaicbro.com

Electrical Measuring Instruments | Practice MCQs Physics for Mdcat

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43 Hot wire ammeters are used for measuring:
Correct Answer: C
Explanation: Hot wire ammeters can measure both AC and DC as they respond to the heating effect of current.
44 Alternating current cannot be measured by D.C. ammeter because:
Correct Answer: B
Explanation: DC ammeters measure average current, which is zero for a complete AC cycle.
45 Alternating current/e.m.f measuring instrument measure its:
Correct Answer: A
Explanation: AC instruments typically display the root mean square (r.m.s) value of the waveform.
46 Alternating current is converted to direct current by:
Correct Answer: A
Explanation: A rectifier converts AC to DC by allowing current to flow in one direction only.
47 A transformer is employed to:
Correct Answer: C
Explanation: Transformers adjust AC voltage levels while maintaining the AC nature of the signal.
48 A capacitor is perfectly insulator for:
Correct Answer: A
Explanation: A capacitor blocks DC once fully charged but allows AC to pass due to continuous charging and discharging.
49 Galvanometer is used to measure:
Correct Answer: B
Explanation: Galvanometers are sensitive instruments designed for measuring small currents.
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