Unit 05 Review Pack 03

1. Calculate the distance from the supply end of the circuit to the load centre.

• 120 feet

• 80 feet

• 100 feet

• 90 feet

2. A three-phase, 480-V, 30-A branch circuit supplies ten 500-W motors. Determine the actual connected and probable future load.

• 35 A AND 45 A

• 5 A AND 60 A

• 15 A AND 50 A

• 10 A AND 20 A

3. Calculate the distance to the load centre L of a three-wire single-phase circuit containing 6 lamps, the total length from supply to the end of the branch = 120 Feet, the distance between each lamp is 15 feet, and the load for each lamp is 1.5 A.

• 95 feet

• 80 feet

• 105 feet

• 90 feet

4. The following equation gives the power factor (PF)

• Watts/volt-amperes

• reactive power/volt-amperes

• watts/ohms

• volt-amperes/watts

5. The demand factor is the ratio between:

• maximum current and peak load

• average load and total connected load

• demand current and total load

• a. maximum current and total connected load

6. What is the total power consumed by ten 500-W motors?

• 8000 W

• 5000 W

• 6000 W

• 4000 W

7. If the voltage is 240 V and the current is 20 A, what is the power in watts?

• 3000 W

• 3600 W

• 4800 W

• 1200 W

8. In a single-phase circuit, if the load is 1500 W and the voltage is 120 V, what is the current?

• 5 A

• 18 A

• 8 A

• 12.5 A

9. Calculate the total length of a circuit if the distance from the supply to the load is 150 feet and the return path is the same.

• 300 feet

• 600 feet

• 450 feet

• 150 feet

10. What is the formula for calculating electrical power?

• a. Voltage x Current

• Voltage - Current

• Voltage + Resistance

• Current x Resistance