Introduction to T&D Systems

Which of the following components provide a source of electricity for transmission and distribution systems

Power plants

True or false a unit transformer increases voltage before electricity is sent to the transmission and distribution system

True

True or false distribution lines carry power from substations to urban and rural areas were voltage is reduce before the power is delivered to customer

True

True or false switch yards can redirect electricity through alternate flow paths by opening and closing certain circuit, breakers and disconnect switches

True

True or faults load refers to all the devices in an electrical circuit that consume electricity

True

True or faults power plants produce electricity by converting the potential energy in fuel into electrical energy

True

True or faults transmission lines are made up of the major components, conductors structures, and insulators

True

______________ can be thought of as a kind of pressure that can cause electricity to flow

Voltage

Which of the following is not descriptive a transmission line conductors 1. Can't support structure. 2. Are usually strong in groups of three. 3. Usually bare metal wire. 4. Can transmit power at extremely high voltage.

1. Can't support structure.

Substations receive ____________, voltage, electricity from transmission lines, and ______________. The voltage saw that the electricity can be distributed to local customers.

1. High 2. Decrease.

Which of the following is not a true statement about a power grid 1. It always extends across continents. 2. It helps ensure a continuous flow of power to customers. 3. It allows companies to buy and sell power to each other. 4. It provides power to individual companies when needed.

1. It always extends across a continent.

Choose the correct answers choose two types of insulators commonly used on transmission lines 1. Post. 2. Disc. 3. Ground.

1. Post 2. Disc

A transmission and distribution system carries electricity from ______________ to ___________

1. Power plant. 2. Customer.

Which of the following statements is wrong? 1. Resistance is the electrical energy, consumed and doing work. 2. Resistance is a loads opposition to current flow. 3. Current flow depends on the amount of resistance in a load. 4. Power is the electrical energy consumed in performing work.

1. Resistance is the electrical energy consume doing work.

What are the major components of a typical T&D system in the order in which the electricity usually flows through them from power generation to customer

1. Switchyard. 2. Transmission lines. 3. Substation. 4. Distribution lines.

Which of the following are not major components of a typical substation 1. Unit transformer. 2. Station transformer. 3. Disconnect switches. 4. Circuit breakers.

1. Unit transformer

Choose the appropriate unit of measurement 1. Voltage _____________ 2. Current _____________ 3. Resistance ____________ 4. Power ______________

1. Volts. 2. Amps. 3. Ohms. 4. Watts

Which of the following is not descriptive of a transmission line? 1. Used to link companies with power grid. 2. Deliver, low, voltage, electricity to customers. 3. Carry electricity from switch yards to sub stations. 4. Carries high-voltage electricity over long distances.

2. Deliver low-voltage, electricity to customers.

Which of the following is not descriptive of a typical oil circuit breaker 1. Contacts emerged in oil to prevent arcing. 2. Uses high-pressure SF6 gas to snuff arcs. 3. Used to open and close, electrical circuits. 4. Can automatically interrupt power win certain problems are detected.

2. Uses high-pressure SF6 gas to snuff arcs.