1. An AC circuit consists only of a pure inductance and a
power source. The relationship between the voltage and the
current in this circuit is that the: current lags the voltage
2. The power factor of a load is equal to the power divided
by the power.: True ; apparent
3. A 10-ohms and 20-ohms resistor are connected in parallel.
The total line current drawn by this parallel combination is 30
amps. Under these conditions, the line voltage will be volts.:
200
4. A 20-ohm resistor is connected in series with a parallel
,combination of two resistors, one of which is 10-ohms, the other
40-ohms. If the voltage across the parallel combination is 40
volts, the voltage across the 20-ohm series resistor is
volts.: 100
5. A certain 120-volts single-phase AC circuit has a power
factor of 80 percent and a watt-meter reading of 1150 watts.
The current drawn by the circuit is
amperes.: 12
6. If the voltage between lines of a 3-phase, 3-wire delta
connected system is 2400 volts, then the phase voltage is
volts: 2400
7. A circuit consists of an inductive reactance of 15 ohms and a
resistor of 20 ohms in series across a 100-volts, 60 cycles AC
,supply. The current in this circuit is amperes.: 4
8. A 3 phase, 3 wire, 208 volt, 60 cycles AC service supplies a
balanced load consisting of three 30 ohms resistors connected
wye. The line current under these conditions os MOST NEARLY
amperes.: 6.9
9. If the level of the electrolyte in a lead acid storage battery
falls below the top of the plates because of evaporations under
normal operating conditions, it is BEST to add: Water
10.A 600 volt cartridge fuse must have knife blade contacts if its
current rating exceeds amperes.: 60
11.When the magnitude of the short circuit currents in a feeder
circuit must be limited, this is USUALLY accomplished by
means of: reactors
, 12.The cross sectional area in circular mils of a standard
cable having 37 strands, each of which ha a diameter of 90
nils, is MOST NEARLY: 300,000
13.A coil having an average diameter of 4 inches is to be
made up from a 1,260 ft long length of wire. The numbers of
turns in this coil will be MOST NEARLY: 1,200
14.The device commonly known as a growler is FREQUENTLY
used to: test DC armature windings for shorts
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