223

A certain 3-phase load draws 27.8 amps and is operating on a circuit that is fed from a 120/240-volt 3-ph, 4-W panelboard. This load is using ___ kVA of power.

11.556

A certain 3-phase load draws 37.3 amps and is operating at 208 volts. This load is using ___ KVA of power.

13.438

A 3Ø 240-volt load is supplied power by a 100 KW generator. The nameplate rating on the load is 59.2 KVA. The line (circuit) conductors between the generator and the load will be carrying ___ amps.

142

A three-phase 69 KVA load will be connected to a circuit that is fed from a 3-pole breaker in a 120/240-volt 3Ø, 4-wire panel. This load will draw ___ amps of current through each circuit conductor.

166

When a 3Ø, 4-W supply system (typically a transformer) delivers 120/240 volts, the system has BØ-to-neutral voltages that are ___ volts.

208

When a 3Ø, 4-W supply system delivers 120/208 volts, the system has line-to-line voltages that are ___ volts.

208

Which of these are typical high transmission voltages?

230 kV

When a 3Ø, 4-W supply system (typically a transformer) delivers 120/240 volts, the system has line-to-line voltages that are ___ volts.

240

A 3Ø 480-volt generator has a rating of 32 KW. The maximum current this generator can deliver to a load is ___ amps.

38.5

If the output of a 3Ø generator is 240 volts, line-to-line, and it has a neutral connection, this is a ___ system.

3Ø, 4-W

A 480-volt 3-phase circuit is connected to the delta primary of a 480 to 240-volt 3-phase transformer. The voltage across any one primary winding is ___ volts.

480

When a 3Ø, 4-W supply system delivers 277/480 volts, the system has line-to-line voltages that are ___ volts.

480

Three-phase loads of 16, 42, and 75 amps are fed from a 240-volt panel. This total 3Ø load is ___ kVA.

55.3

A 208-volt, 17.2 KVA, single-phase load is connected to a 120/208-volt, three-phase, 4-wire panel. The load will draw ___ amps at the applied voltage.

82.7

Which of the following is a type of electric power generating plant?

Geothermal Nuclear Thermal

Distribution lines are typically between a substation and the customer.

True

When a 3Ø, 3-W supply system delivers 240 volts, the system is ___ connected.

delta

When a 3Ø, 4-W supply system delivers 120/240 volts, the system is ___ connected.

delta

Inverters are required to convert the output energy from ___ to AC.

solar arrays

Substations are used to ___.

step up generated voltage for transmission step down transmission voltages for customer usage

A 3Ø, 480-volt, 45 KVA, wye-connected load draws ___ a 3Ø, 480-volt, 45 KVA, delta-connected load.

the same line current as

When a 3Ø, 4-W supply system delivers 120/208 volts, the system is ___ connected.

wye

When a 3Ø, 4-W supply system delivers 277/480 volts, the system is ___ connected.

wye

48.6

Refer to Figure 219.102. Each circuit conductor feeding the load connected to Circuit LB-6,8 will carry ___ amps.

50.5

Refer to Figure 219.102. Each circuit conductor feeding the load connected to Circuit LB-7,9,11 will carry ___ amps.

144

Refer to Figure 221.402. If the nameplate rating of the 3Ø motor is 60 KVA at 240 volts, A meter 2 will indicate ___ amps at the applied voltage.

Yes

Refer to Figure 221.402. Is the current flowing in generator Coil 1 equal to the current flowing in Motor Winding A?

more than

Refer to Figure 221.402. The current flowing in Line 3 is ___ the current flowing in Motor Winding B.

217

Refer to Figure 221.402. The nameplate rating of the 3Ø Motor is 90 KVA at 240 volts. Each circuit conductor to the motor will carry ___ amps at the applied voltage.

28.9

Refer to Figure 221.404. If the nameplate rating of the 3Ø boiler is 12 KW at 240 volts, A meter 2 will indicate ___ amps at the applied voltage.

No

Refer to Figure 221.404. Is the winding (coil) current, flowing in the generator in Coil 1, equal to the current flowing in Heating Element A?

more than

Refer to Figure 221.404. The current flowing in Line 3 is ___ the current flowing in Coil 1.

115.5

Refer to Figure 221.404. The nameplate rating of the 3Ø boiler is 48 KW at 240 volts. Each circuit conductor to the boiler will carry ___ amps at the applied voltage.

138.6

Refer to Figure 221.404. The voltage applied to Heating Element A is ___ volts.