Ch 26 Flashcards
In one type of AC electrodynamometer instrument, the two field coils and the single armature coils and the single armature coil are so connected that:
all coils are in series
When a thermocouple is heated, it produces:
DC indicated on a DC meter
When using a cross-coil power-factor meter on a 3-phase circuit, the instrument indication is accurate:
only if the load is balanced and the power factor is the same for all phases
Power-factor meters measure the:
ratio of true power to apparent power
Most watt meters are a/an:
electrodynamometer
A copper-oxide rectifier is a device that:
classified as a uni-directional conductor
AC voltages in the higher ranges are usually measured with a:
voltmeter and potential XFMR
The range of an AC ammeter may be extended by using a:
current XFMR
AC ammeters are generally calibrated to read root-mean-square valves. This also means the ammeter is calibrated to read:
effective values
In the absence of a power-factor meter the power factor of a certain electrical load may be determined by using:
a wattmeter, an ammeter, and a voltmeter
The junction of the two dissimilar metals of a thermocouple produces a flow of current when the junction is:
heated
Which one of the below instrument types would not utilize the effect of current to measure voltage?
electrostatic
The meter measuring mechanism used in recording instruments is basically the same as that used for the conventional indicating instrument except in the area of:
damping setting
The circuit measuring arrangement of the most ground detector meters shows the neutral points of the ground detector potential transformer primary winding to be:
solidly grounded
The meter whose indicated reading would be equal to E x I x sin(theta) is a
varmeter
