2-2-2
Current is measured in ? . Select one: a.amperes b.ohms c.volts d.watts
A. Amperes
When a 3-phase current unbalance exceeds ? , a test for voltage unbalance should be performed. Select one: a.3% b.10% c.20% d.30%
B. 10%
Most digital multimeter displays include a(n) ? to show changes and trends in a circuit. Select one: a.analog scale b.bar graph c.diode test mode d.MIN MAX mode
B. Bar graph
One problem with small 3-phase voltage imbalances is that they cause high ? imbalances. Select one: a.core b.current c.power d.resistance
B. Current
The ? value of a sine wave is the maximum instantaneous value of either the positive or negative values in the sine wave. Select one: a.average b.peak c.positive d.rms
B. Peak
Many test instruments include a ? in the current-measuring circuit to prevent damage caused by excessive current. Select one: a.bypass b.circuit breaker c.fuse d.relay
C. Fuse
A(n) ? is a test meter that measures resistance, the opposition to the flow of electrons in a circuit. Select one: a.ammeter b.chronometer c.ohmmeter d.voltmeter
C. Ohmmeter
In-line ammeters require the circuit to be ? so the ammeter can be inserted into the circuit to acquire a reading. Select one: a.closed b.low voltage c.opened d.parallel
C. Opened
AC voltage is voltage in a circuit that reverses its direction of flow at regular intervals, and is stated and measured as peak, average, or ? value. Select one: a.MIN/MAX b.regular c.rms d.standard
C. RMS
An ohmmeter is used to measure the ? . Select one: a.amperage b.direction of voltage flow c.resistance d.voltage
C. Resistance
? leakage current is current that flows from areas on conductors where insulation has been removed to allow electrical connections. Select one: a.Capacitive b.Conductive c.Surface d.Terminal
C. Surface
One advantage of voltage testers is that they have a lower impedance (resistance) and draw more current than voltage indicators, which allows them to be used for testing ? . Select one: a.insulation b.job order motors c.job order wiring d.GFCIs
D. GFCIs
Voltage measurements using the ? on a digital multimeter are useful in identifying low voltage conditions. Select one: a.analog scale b.bar graph c.diode test mode d.MIN/MAX mode
D. MIN / MAX mode
A clamp-on ammeter is a test instrument that measures current in a circuit by measuring the strength of the ? around a single conductor. Select one: a.ampacity b.electromotive force c.inductive reactance d.magnetic field
D. Magnetic field
AC current is current in a circuit that flows in one direction only. Select one: True False
False
Most analog multimeters do not have calibrated scales that correspond to the different selector switch settings. Select one: True False
False
The higher the resistance in a circuit, the higher the current flow through the circuit. Select one: True False
False
Voltage indicators only indicate that voltage and current are present; they do not indicate the actual voltage. Select one: True False
False
A clamp-on ammeter is typically used to measure current in a circuit with over one ampere of current. Select one: True False
True
A closed switch that is operating properly has continuity. Select one: True False
True
A megohmmeter is a high-resistance ohmmeter used to measure insulation deterioration on various wires by measuring high-resistance values during high voltage test conditions. Select one: True False
True
A permanent test instrument is a device that is installed in a process, or at a bench, to continually measure and display quantities. Select one: True False
True
A portable test instrument is used to take real-time (momentary) measurements. Select one: True False
True
A voltage indicator needs only to be near a voltage source to indicate the presence of voltage. Select one: True False
True
Measuring current is useful because only current can be used to determine how much a circuit is loaded (working). Select one: True False
True
When using an ohmmeter, the resistance of all components connected in parallel with the component being tested affects, and typically lowers, the resistance reading. Select one: True False
True
When voltage measurements are different from what is expected, the voltage measurement is most likely to be lower than normal. Select one: True False
True
