Electricity unit 16 review

The type, size, and maximum amperage carrying capacity of wire that can be used for a particular application is governed by the ________________.

•  

  International Code Council

• National Electrical Code

• Department of Energy

• National Council on Electrical Safety

Voltage that is lost as electrical current travels through a conductor from the power source to the equipment is known as _______________________

• Voltage drop
• Power factor

• Power loss factor

• Voltage reactance

What is the maximum recommended voltage drop for a branch circuit?

• 3%

• 5%

• 10%

• 25%

In most cases, the conductor size used to supply power to heating and cooling equipment can be taken directly from the NEC wire sizing table without the need of factoring in voltage drop if the wire length remains under ________________.

• 50 feet

• 100 feet

• 500 feet

• 1,000 feet

What does it mean if a technician measures 225 volts at an operating condensing unit and 240 volts at the breaker in the panel supplying voltage to the condensing unit circuit?

• There is a voltage drop of 15 volts through the conductor

• The unit is connected to the wrong voltage

• The conductor supplying power to the unit is too large

• The circuit breaker connected to the unit is too small

How much voltage drop will there be through a conductor with a resistance of 0.5 ohms and a current flow of 20 amps?

• 120 volts

• 10 volts

• 20 volts

• 100 volts

What is a disadvantage of using aluminum conductors?

• Aluminum is much more expensive that copper

• Aluminum is heavy and not very flexible

• Aluminum corrodes easily and the connections may become loose over time

• Aluminum is a poor conductor of electricity

Fusible disconnect switches provide a means of disconnecting power to equipment as well as __________________________.

• Ground fault circuit protection

• A means of secondary control

• Overcurrent protection

• A means of voltage control

Unless updated and replaced, residential structures constructed prior to 1968 are likely to utilize what type of load center?

• Breaker panel

• Fusible load center

• Direct connection load center

• Single-pole load center

A resettable overload device that will open automatically if the current flow through the device goes over its rating best describes a ___________________.

• Breaker

• Fuse

• Time-delay fuse

• Pilot-overload relay