Measuring Voltage and Current MCQ’s

Electric Circuits Electronics & Communication Engineering

This set of Electric Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Measuring Voltage and Current”.

1. An ideal voltmeter has ___________ equivalent resistance and ideal ammeter has ___________ equivalent resistance.
a) Unity, Unity
b) Zero, infinite
c) Infinite, Zero
d) Zero, Zero

2. Continuous voltages (or) current signals are measured using
a) Tachometers
b) Sonometers
c) Analog meters
d) Digital meters

3. ____________ helps in current measurement by placing it in ____________ with the circuit element.
a) Voltameter, Parallel
b) Ammeter, series
c) Voltmeter, series
d) Ammeter, parallel

4. Digital meters are preferable than analog meters.
a) True
b) False

5. A 25mv, 2mA d’Arsonval movement is to be used in voltmeter whose full scale reading is 100v. The resistance inserted by 100v meter into circuit is ___________
a) 1 * 105Ω
b) 1 * 106Ω
c) 1 * 104Ω
d) 1 * 103Ω

6. An ideal ammeter functions as __________ circuit
a) A short
b) An open
c) A power
d) An infinite

7. A 20mv, 1mA d’Arsonval movement is used in an ammeter whose full-scale reading is 10 mA. Determine RA.
a) 2.222Ω
b) 6.667Ω
c) 5.92Ω
d) 3.333Ω

8. An ideal voltmeter functions as __________ circuit
a) A short
b) An open
c) A power
d) An infinite

9. A 100mv, 5mA d’Arsonval movement is to be used in an ammeter whose full-scale reading is 1A. Calculate RA.
a) 0.7 ohms
b) 0.5 ohms
c) 0.1 ohms
d) 0.2 ohms

10. A 122mv, 12mA d’Arsonval movement is to be used in voltmeter whose full scale reading is 120v. The resistance inserted by 120v _____________
a) 1200Ω
b) 12000Ω
c) 1000Ω
d) 10,000Ω

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