Page 871 - Basic Electrical Engineering

b. a voltmeter is a low-resistance instrument while an ammeter is a high-resistance
instrument
c. a voltmeter is provided with a shunt while an ammeter is provided with a multiplied
d. a voltmeter is connected in series with a circuit while an ammeter is connected in
parallel.

11. Three-phase power P in terms of line and phase voltages and currents and power factor can be
expressed as

a. P = V I cosϕ
ph ph
b. P = V I cosϕ
L L
c. P = V ph ph
I cosϕ
d. P = 3V I cosϕ.
L L
12. For measurement of electrical energy, we may use a

a. wattmeter
b. kWh meter
c. multimeter
d. voltmeter, ammeter, and a power factor meter.

13. The following could be one of the errors in an energy meter

a. clamping
b. clipping
c. creeping
d. clogging.

14. The energy meter installed near the main switch in residences and other locations is

a. an indicating- or deflecting-type instrument
b. an integrating-type instrument
c. a recording-type instrument
d. an absolute instrument.

15. A voltmeter has a uniform scale with 100 divisions, the full scale reading is 100 V and can be
read up to 1/10 of a scale diviation with a fair degree of certainty. Its resolution is

a. 0.1 V
b. 0.2 V
c. 0.01 V
d. 0.02 V.

16. The deflection in moving-iron instruments is proportional to

a. square of the rms value of the current
b. rms value of the current