Book 2: 7-32 - "Microturbines" Flashcards
Microturbines operate at high speeds, which are typically in the range of ___________ rpm.
Select one:
A. 50 000 to 100 000
B. 25 000 to 50 000
C. 60 000 to 120 000
D. 25 000 to 80 000
E. 50 000 to 120 000
E. 50 000 to 120 000
An undesirable feature of microturbines is:
Select one:
A. Oil System
B. Size
C. Large floor space
D. Heavy Oils as Fuel
E. Noise
E. Noise
For a micro-turbine combined heating system, which of the following statements is NOT true?
Select one:
A. The hot gases are allowed to expand through the gas turbine, creating rotational energy
B. The compressor discharges to the combustor
C. Atmospheric air is drawn into an axial flow compressor where it is compressed
D. Fuel is added and ignited in a very rapid combustion process
E. The rotating energy is transferred to the condenser and the alternator via a common shaft
E. The rotating energy is transferred to the condenser and the alternator via a common shaft
The most common fuel used for microturbines is:
Select one:
A. Kerosene
B. Natural gas
C. Diesel fuel
D. Light oil
E. Gasoline
B. Natural gas
The main advantage of foil bearings in microturbines is:
Select one:
A. The use of an external pressurization system
B. The anti-wear coating
C. The elimination of oil systems
D. The noise reduction
E. The high speed of shaft rotation.
C. The elimination of oil systems
The exhaust gas from the microturbine in a combined heating system is:
Select one:
A. sent through a boiler or water heater
B. recycled through the compressor
C. exhausted directly to atmosphere
D. used to directly heat a building
E. at about room temperature
A. sent through a boiler or water heater
Lubrication problems are reduced in microturbines by using:
Select one:
A. keeping oil temperature low
B. only synthetic oil
C. using roller bearings
D. preheating the oil
E. using foil bearings
E. using foil bearings
Boiler checks are unnecessary in the automatic microturbine combined heating system.
Select one:
True
False
False
The foil bearings used in a microturbine are a type of _____ bearing.
Select one:
A. Water
B. Sleeve
C. Air
D. Journal
E. Antifriction
C. Air
Which of the following from a microturbine-driven alternator is/are synchronized by a converter to meet the electrical demand of the facility?
1. voltage
2. amperage
3. frequency
4. resistance
5. phase
Select one:
A. 3 only
B. 1 and 2 only
C. 2 and 4 only
D. 1, 3, and 5
E. 1, 2, and 3
D. 1, 3, and 5
Voltage, Frequency and Phase
Boiler checks are unnecessary in the automatic microturbine combined heating system.
Select one:
True
False
False
The exhaust gas from the microturbine in a combined heating system is:
Select one:
A. At about room temperature
B. Sent through a boiler or water heater
C. Exhausted directly to atmosphere
D. Used to directly heat a building
E. Recycled through the compressor
B. Sent through a boiler or water heater
Which of the following from a microturbine-driven alternator is/are synchronized by a converter to meet the electrical demand of the facility?
1. voltage
2. amperage
3. frequency
4. resistance
5. phase
Select one:
A. 1 and 2 only
B. 1, 3, and 5
C. 1, 2, and 3
D. 2 and 4 only
E. 3 only
B. 1, 3, and 5
The most common fuel used for microturbines is:
Select one:
A. Diesel fuel
B. Light oil
C. Natural gas
D. Kerosene
E. Gasoline
C. Natural gas
Microturbines operate at high speeds, which are typically in the range of ___________ rpm.
Select one:
A. 60 000 to 120 000
B. 50 000 to 100 000
C. 50 000 to 120 000
D. 25 000 to 50 000
E. 25 000 to 80 000
C. 50 000 to 120 000
