Page 81 - Teach Yourself Electricity and Electronics

Quiz 61

C. Magnetic force.
D. Electroscopic force.
3. Suppose a certain current in a galvanometer causes the needle to deflect 20
degrees, and then this current is doubled. The needle deflection:
A. Will decrease.
B. Will stay the same.
C. Will increase.
D. Will reverse direction.
4. One important advantage of an electrostatic meter is that:
A. It measures very small currents.
B. It will handle large currents.
C. It can detect ac voltages.
D. It draws a large current from the source.
5. A thermocouple:
A. Gets warm when current flows through it.
B. Is a thin, straight, special wire.
C. Generates dc when exposed to light.
D. Generates ac when heated.

6. One advantage of an electromagnet meter over a permanent-magnet meter is
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. An ammeter shunt is useful because:
A. It increases meter sensitivity.
B. It makes a meter more physically rugged.
C. It allows for measurement of a wide range of currents.
D. It prevents overheating of the meter.
8. Voltmeters should generally have:
A. Large internal resistance.
B. Low internal resistance.
C. Maximum possible sensitivity.
D. Ability to withstand large currents.
9. To measure power-supply voltage being used by a circuit, a voltmeter
A. Is placed in series with the circuit that works from the supply.