309A Circuit Theory and Calculations 5

Question 1

What happens to current flow when the resistance in a circuit is doubled while voltage remains constant?

Accepted Answer

Current is halved

Answer

Current doubles

Answer

Current stays the same

Answer

Current quadruples

Question 2

A 50 m run of No. 12 AWG copper conductor (resistance 5.21 Ω/km) carries 16 A. What is the voltage drop for the round trip?

Accepted Answer

8.34 V

Answer

4.17 V

Answer

5.21 V

Answer

16.67 V

Question 3

What unit is used to measure electrical energy consumption?

Accepted Answer

Kilowatt-hour (kWh)

Answer

Watt (W)

Answer

Volt-ampere (VA)

Answer

Ampere-hour (Ah)

Question 4

In a balanced three-phase wye system with a line voltage of 208 V, what is the phase voltage?

Accepted Answer

120 V

Answer

69.3 V

Answer

104 V

Answer

208 V

Question 5

What is the maximum demand of a load that operates at 50% duty cycle with a peak demand of 20 kW?

Accepted Answer

10 kW

Answer

5 kW

Answer

15 kW

Answer

20 kW

Question 6

What is the current flowing through a 4.7 kΩ resistor with 24 V applied across it?

Accepted Answer

5.1 mA

Answer

0.51 mA

Answer

51 mA

Answer

510 mA