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WorksheetsDay 9 Measuring Instruments
Total questions: 19
Worksheet time: 10mins
The pointer of a D'Arsonval meter movement is deflected in proportion to the amount of current through the:
needle
coil
probes
The current sensitivity of a meter movement is the amount of current required to drive the meter movement to a:
half-scale deflection
full-scale deflection
minimum deflection
Meter damping may be accomplished by:
electrical means only
mechanical means only
Both electrical and mechanical
The basic idea of a multirange ammeter is to make the meter usable over a wide range of voltages. In order to accomplish this, each range must utilize a different:
shunt resistance
meter scale
series resistor
When voltmeters are used, they are connected to a circuit in:
series
parallel
The function of the ohmmeter is to measure__________.
electromotive force
power consumption
resistance
When the analog ohmmeter leads are open, the meter is at a full scale deflection, indicating an infinite ( ∞) resistance or a (an) __________ circuit.
short
open
closed
Electric power is measured by means of a __________.
The viewing capabilities of the oscilloscope make it possible to see and quantify various __________ characteristics.
resistance
waveform
transformers
Digital multimeters (DMM) and digital voltmeters (DVM) are more common due to their __________.
lack of need for batteries
ease of use
ability to be stored in smaller places
When ammeters are used, they are connected to a circuit in:
series
parallel
Electrical damping of an analog meter relies on:
a positronic field developed by amplified flux lines in the movement coil.
small springs with electrical current passing through them.
magnetic fields created by eddy currents opposing motion of the coil.
A meter that is self-excited operates from a power source ________ the meter.
The term ________ is applied to methods used to bring the pointer of an electrical meter to rest after it has been set in motion.
Air damping is a common method of damping by ________ means.
________ connect an ammeter across a source of voltage, such as a battery or generator.
Never
Always
It is acceptable to
Always connect ammeter in ________ with the element through which the current flow is to be measured.
When using an ammeter, use a range large enough to keep the deflection ________ than full scale.
Current reversal because of incorrect connection of an analog meter in the circuit results in a reversed meter deflection and frequently causes:
bending of the meter needle
