MCQ – Basic Electrical
1.
Measuring range of voltmeter can be extended by using
§ high shunt resistance
§ high series resistance
§ low shunt resistance
§ low series resistance
2. The
function of a shunt in an ammeter is to
§ increase the instrument resistance
§ bypass the current
§ reduce the voltage drop
across the instrument coil
§ increase the current
flowing through the instrument coil
3. A
moving instrument has a resistance of 0.6Ω and a full-scale deflection current
of 0.1A. To convert it into an ammeter 0-15A range, the resistance of shunt
should be
§ 0.6Ω
§ 0.06Ω
§ 0.1Ω
§ 0.004Ω
4. High
ac voltage are usually measured with
§ magnetic voltmeter
§ inductive voltmeter
§ potential transformer
with voltmeter
§ current transformers and
voltmeter
5.
Which instrument has lowest resistance?
§ ammeter
§ voltmeter
§ frequency meter
§ meggar
6. All
meters used for measuring current, voltage, and resistance are basically
§ voltmeter
§ ammeter
§ multimeter
§ none of the above
7.
Which of the following is used to measure the resistance of an electrical
installation?
§ multimeter
§ ammeter and voltmeter
§ maxwell’s bridge
§ meggar
8.
Meggar is an instrument used for measuring
§ high resistance and
insulation resistance
§ medium resistance
§ low resistance
§ leakage current
9.
Which of the following statement associated with purely resistive circuits is
correct?
§ PF is unity
§ power consumed is zero
§ heat produced is zero
§ PF is zero
10. A
leading power factor implies
§ current leads the voltage
§ current lags behind the
voltage
§ voltage leads the current
§ none of the above
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