CHAPTER 3

The attraction or repulsion between two electrically charged object is called Ans: Electrostatic force

The change in the direction of a compass needle, when current carrying wire is brought near, is calledAns: Electromagnetic deflection

Suppose a certain current in a galvanometer causes the needle to deflect by 20 degrees, and then this current is doubled while the polarity stays the same. The angle of the deflection will Ans: increase.

One important advantage of an electrostatic meter is the fact thatAns: it can detect and indicate ac voltages as well as dc voltages.

A thermocoupleAns: gets warm when dc flows though it.

An important advantage of an electromagnet type meter over a permanent magnet meter is the fact thatAns: the electromagnet meter gets more rugged.

Ammeter shunts are useful becauseAns: they allow for measurements of large currents.

Voltmeters should haveAns: high internal resistance.

In order to measure the power-supply voltage that is applied to an electrical circuit, a voltmeter should be placedAns: in parallel with the circuit that works from the supply.

Which of the following will not normally cause a large error in an ohmmeter reading?Ans: A small change in the resistance to be measured.

The main advantage of FETVM over a conventional voltmeter is the fact that the FETVMAns: draws less current from the circuit under test.

Which of the following is not a function of a fuse?Ans: To ensure there is enough current available for an appliance to work right.

The utility’s motor speed depends directly onAns: the number of watt-hours being used at the time.

A utility meter’s readout indicatesAns: energy.

A typical frequency counter Ans: is accurate to six digits or more.

A VU meter is never used to get a general indication ofAns: visible light intensity.

The meter movement in an illumination meter directly measures Ans: current.

An oscilloscope cannot be used to indicateAns: Energy