Title: Module 5 Test
Course: WIND 150WH Wind Turbine Materials and Electro Mechanical Equipment > Section: WIND 150WH Wind Turbine Materials and Electro Mechanical Equipment

Q: Electricity from the power plant is fed to nearby areas by use of distribution lines, substations, transformers, and other types of utility lines.
- True
- False
A: True

Q: Power needed further away is ____________ in voltage (electrical pressure) and gets delivered to distant substations via transmission lines. This saves on transmission line size and thus weight.
- stepped up
- stepped down
A: stepped up

Q: There are many types of power poles and towers. They are designed to carry specific voltages and types of power.
- True
- False
A: True

Q: Power plants burn immense amounts of coal as a source of energy. A coal fired power plant burns about ____________ of coal each day, during peak seasons.
- 600 tons
- 10,000 tons
- 1,000 tons
- 6,000 tons
A: 10,000 tons

Q: Another source of energy used to create electrical power is natural gas, though it is not a cleaner alternative to coal.
- True
- False
A: False

Q: ____________ provide a localized area to split, monitor, and distribute various required voltages to utility and other power distribution lines. They are an important part of the grid and of great concern when considering grid efficiencies and losses.
- Power plants
- Substations
- Transmission lines
- Wind farms
A: Substations

Q: Power correction and other efficiency requirements are __________ when designing substations.
- not a consideration
- considered
A: considered

Q: __________________ send power information, such as noise, brownout warnings, and loading effects on each branch of its power to utility companies.
- Monitoring systems
- Transformers
- Grid transformers
- Grid-tied systems
A: Monitoring systems

Q: Within substations, ________________ are used to shut down power or to act as a selector, diverting power to needed areas.
- switchgears
- fuses
- selector bars
- diverters
A: switchgears

Q: A transformer needs to deliver 200a at 240v to a business. The transformer’s primary is to be connected to a 16kV line. What is that
smallest transformer that would work best?
- A 200:3 ratio, 48kVa, step-down type
- A 2:3 ratio, 48kVa, step-down type
- A 200:3 ratio, 9.6MVa, step-down type
- None of the above
A: A 200:3 ratio, 48kVa, step-down type

Q: Distribution lines deliver electrical power to industrial, commercial, and residential areas.
- True
- False
A: True

Q: The transformer increases the “pressure,” so the flow quantity can decrease and the overall power remains the same. This saves on wire ____________.
- diameter and cost
- fatigue costs
- length and cost
- insulator costs
A: diameter and cost

Q: High voltage lines are _________ from poles by glass/ceramic insulators.
- isolated
- insulated
- mounted
- All of the above
A: All of the above

Q: Power line fuses are used to prevent catastrophic __________ conditions.
- over-voltage
- over-power
- over-unity
- short-circuit
A: short-circuit

Q: ______________ power lines poles and device cases is important as it ensures voltage arcs or lightning will be shorted to ground
rather than passing on to other grid, and customer, devices.
- Grounding
- Bonding
- Tying off
- Strapping
A: Grounding

Q: Linemen make up a large part of the wind farm installation workforce. They are required to survey, design, and build all structures pertaining to the linking of towers by lines and the overall collection at specially designed substation/s.
- True
- False
A: True

Q: Wind farm substations are designed to collect electrical power, monitor power penetration to the grid, and dis/connect from the farms power lines.
- True
- False
A: True

Q: Grid-tied systems are not associated with power penetration.
- True
- False
A: False

Q: NEC stands for the ____________.
- National Electrical Council
- National Electrical Code
- New Electrical Construction
- National Energy Code
A: National Electrical Code

Q: Grid-tied systems must out of phase with the grid.
- True
- False
A: False

Q: A disconnect is used for power isolation.
- True
- False
A: True

Q: Net metering ___________ ordinary utility meters.
- differs from
- is similar to
A: differs from

Q: Net metering covered in ________, Section 210.
- NEC
- PURPA
- OSHA
- IEC
A: PURPA

Q: A U.S. grid-tied inverter is designed to sync its output with the grid’s 60Hz ac.
- True
- False
A: True

Q: Smaller wind turbines use ______ generators. Their output is made into ac (and synced with the grid’s frequency) by a/n ______.
- ac, rectifier
- DC, inverter
- ac, inverter
- PM, rectifier
A: DC, inverter

Q: Some _______ wind turbines have double-fed induction generators. They use an inverter-generator feedback system to align the exciter current of the generator to 60Hz. This allows the synchronous speed to deviate by up to about 10%.
- small
- large
- None of the above: this type of system does not exist.
A: large

Q: Low-voltage ride through or LVRT is a means of controlling the actions and connection of a wind turbine when voltage levels ___________________.
- unexpectedly increase
- spike
- unexpectedly decrease
- surge
A: unexpectedly decrease

Q: When a section of the grid is isolated from the rest it is called _______________.
- islanding
- separation
- exemption
- clearing
A: islanding

Q: DC is allowed to bleed through inverters into the grid.
- True
- False
A: False

Q: Capacitive and inductive loads cause the current and voltages to become out of phase. Since power is the product of current and voltage, if the power is not happening at the same time, there is an overall __________ to the circuit.
- voltage surge
- power loss
- voltage decrease
- power gain
A: power loss

Q: Ground rods are used in conjunction with a ground wire to prevent __________.
- damage from lightning
- ground faults
- shock
- all of the above
A: all of the above

Q: Electrical shock is prevented by re-routing power from energized equipment cases to ground. This prevents a faulty source line from energizing the equipment case or structure if it comes into contact with it.
- True
- False
A: True

Q: List two reasons to ground device cases.

Q: On wind farms wires are buried for protection and aesthetics.
- True
- False
A: True

Q: What type of machine is used to trench out the soil quickly for long runs of conduit?

Q: What are the two methods of feeder lines delivery?
- Underground (buried) and overhead
- In ground and above ground
- Ac and DC
- NEC and IEC
A: Underground (buried) and overhead

Q: A _____________ is a pipe that provides protection for buried feeder lines from just below the ground up a structure.
- conduit riser
- protection tube
- feeder climber
- weather head
A: conduit riser

Q: ________________ are used for overhead feeders and prevent precipitation and debris from entering the top of the service conduit.
- Weather heads
- Grommets
- Moisture cap
- Weather seal
A: Weather heads

Q: Wind farm _______________ collect, condition, and connect power to transmission/distribution lines.
- grid collectors
- substations
- phase inverters
- transformers
A: substations

Q: Wire that run between buildings and power transformers are sometimes called _____________.
- service drops
- service loops
- drop loops
- service systems
A: service drops