GIBILISCO CHAP 3

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問題一覧

The force between two electrically charged objects is called

B. Electrostatic force.

The change in the direction of a compass needle, when a current-carrying wire

A. Electromagnetic deflection.

Suppose a certain current in a galvanometer causes the needle to deflect 20 degrees, and then this current is doubled. The needle deflection:

C. Will increase.

One important advantage of an electrostatic meter is that:

C. It can detect ac voltages.

A thermocouple:

A. Gets warm when current flows through it.

One advantage of an electromagnet meter over a permanent-magnet meter is that:

D. The electromagnet meter is more rugged.

An ammeter shunt is useful because:

C. It allows for measurement of a wide range of currents.

Voltmeters should generally have:

A. Large internal resistance

To measure power-supply voltage being used by a circuit, a voltmeter

D. Is placed in parallel with the circuit that works from the supply.

Which of the following will not cause a major error in an ohmmeter reading?

C. A small change in the resistance to be measured.

The main advantage of a FETVM over a conventional voltmeter is the fact that the FETVM:

B. Draws less current from the circuit under test.

Which of the following is not a function of a fuse?

A. To be sure there is enough current available for an appliance to work right.

A utility meter’s motor speed works directly from:

C. The number of watts being used at the time.

A utility meter’s readout indicates:

D. Energy.

A typical frequency counter:

B. Is usually accurate to six digits or more.

A VU meter is never used for measurement of:

D. Energy.

The meter movement in an illumination meter measures:

A. Current.

An oscilloscope cannot be used to indicate:

C. Energy

The display in Fig. 3-18 could be caused by a voltage of:

D. No way to tell; the meter is malfunctioning.

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