Measurements MCQ's|Electrical Measurements MCQ|Electronics Measurements MCQ
1. The attraction or repulsion between two electrically charged objects is called
(a) electromagnetic deflection.
(b) electrostatic force.
(c) magnetic force.
(d) electroscopic force.
2. The change in the direction of a compass needle, when a current-carrying wire is brought
near, is called
(a) electromagnetic deflection.
(b) electrostatic force.
(c) magnetic force.
(d) electroscopic force.
3. Suppose a certain current in a galvanometer causes the compass needle to deflect by 20 degrees, and then this current is doubled while the polarity stays the same. The angle of the needle deflection will
(a) decrease.
(b) stay the same.
(c) increase.
(d) reverse direction.
4. One important advantage of an electrostatic meter is the fact that
(a) it measures very small currents.
(b) it can handle large currents.
(c) it can detect and indicate ac voltages as well as dc voltages.
(d) it draws a large current from a power supply.
5. A thermocouple
(a) gets warm when dc flows through it.
(b) is a thin, straight, special wire.
(c) generates dc when exposed to visible light.
(d) generates ac when heated.
6. An important advantage of an electromagnet-type meter over a permanent-magnet meter is
the fact that
(a) the electromagnet meter costs much less.
(b) the electromagnet meter need not be aligned with the earth’s magnetic field.
(c) the permanent-magnet meter has a more sluggish coil.
(d) the electromagnet meter is more rugged.
7. Ammeter shunts are useful because
(a) they increase meter sensitivity.
(b) they make a meter more physically rugged.
(c) they allow for measurement of large currents.
(d) they prevent overheating of the meter movement.
8. Voltmeters should generally have
(a) high internal resistance.
(b) low internal resistance.
(c) the greatest possible sensitivity.
(d) the ability to withstand large currents.
9. In order to measure the power-supply voltage that is applied to an electrical circuit, a voltmeter should be placed
(a) in series with the circuit that works from the supply.
(b) between the negative pole of the supply and the circuit working from the supply.
(c) between the positive pole of the supply and the circuit working from the supply.
(d) in parallel with the circuit that works from the supply.
10. Which of the following will not normally cause a large error in an ohmmeter reading?
(a) A small voltage between points under test
(b) A slight change in switchable internal resistance
(c) A small change in the resistance to be measured
(d) A slight error in the range switch position
12. The main advantage of a FETVM over a conventional voltmeter is the fact that the FETVM
(a) can measure lower voltages.
(b) draws less current from the circuit under test.
(c) can withstand higher voltages safely.
(d) is sensitive to ac voltage as well as to dc voltage.
13. Which of the following is not a function of a fuse?
(a) To ensure there is enough current available for an appliance to work right
(b) To make it impossible to use appliances that are too large for a given circuit
(c) To limit the amount of power that a device can draw from the electrical circuit
13. Which of the following is not a function of a fuse?
(a) To ensure there is enough current available for an appliance to work right
(b) To make it impossible to use appliances that are too large for a given circuit
(c) To limit the amount of power that a device can draw from the electrical circuit
(d) To make sure the current drawn by an appliance cannot exceed a certain limit
14. A utility meter’s motor speed depends directly on
(a) the number of ampere-hours being used at the time.
(b) the number of watt-hours being used at the time.
(c) the number of watts being used at the time.
(d) the number of kilowatt-hours being used at the time.
15. A utility meter’s readout indicates
(a) voltage.
(b) power.
(c) current.
(d) energy.
16. A typical frequency counter
(a) has an analog readout.
(b) is accurate to six digits or more.
(c) works by indirectly measuring current.
(d) works by indirectly measuring voltage.
17. A VU meter is never used to get a general indication of
(a) sound intensity.
(b) decibels.
(c) power in an audio amplifier.
(d) visible light intensity.
18. The meter movement in an illumination meter directly measures
(a) current.
(b) voltage.
(c) power.
(d) energy.
19. An oscilloscope cannot be used to indicate
(a) frequency.
(b) wave shape.
(c) energy.
(d) peak signal voltage.
1. b 2. a 3. c 4. c 5. a 6. d 7. c 8. a 9. d 10. c 12. b 13. a 14. c 15. d
16. b 17. d 18. a 19. c
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