Book 2 Unit 7 Flashcards
An undesirable feature of microturbines is:
A) Oil systems
B) Large floor space
C) Noise
D) Size
E) Heavy oils as fuel
C) Noise
The facilities alternator output must be the same as that of the utilities system relative to which of the following:
A) The resistance on each must be the same
B) The wattage on each must be the same
C) The voltage on each must be the same
D) The amperage on each must be the same
E) The impedance on each must be the same
C) The voltage on each must be the same
Larger engines incorporate a system whereby compressed air is directed _________ in order to cause engine rotation.
A) To the starter motor
B) On to the fly wheel
C) To the turbine
D) Onto the top of the pistons
E) To the motor crank
D) Onto the top of the pistons
Microturbines operate at high speeds, which are typically in the range of ____________ rpm.
A) 50 000 to 100 000
B) 25 000 to 80 000
C) 60 000 to 120 000
D) 25 000 to 50 000
E) 50 000 to 120 000
E) 50 000 to 120 000
The main advantage of foil bearings in microturbines is:
A) The noise reduction
B) The use of an external pressurization system
C) The anti-wear coating
D) The elimination of oil systems
E) The high speed of shaft rotation
D) The elimination of oil systems
Proper routine pre-start and operational checks may include all of the following except the:
A) Machine exhaust temperatures
B) Start-up energy used
C) Atmospheric weather conditions
D) Lubrication system
E) Cooling system
C) Atmospheric weather conditions
The exhaust gas from the microturbine in a combined heating system is:
A) Sent through a boiler or water heater
B) Used to directly heat a building
C) Recycled through the compressor
D) At about room temperature
E) Exhausted directly to atmosphere
A) Sent through a boiler or water heater
Boiler checks are unnecessary in the automatic microturbine combined heating system.
A) True
B) False
B) False
An electric starter motor on an internal combustion engine is usually supplied with _________ volt DC power.
A) 32
B) 12
C) 24
D) 6
E) 110
B) 12
Temperatures are very important, and sometimes the cooling system includes a ________ which has pressures associated with it.
A) Cooling tower
B) Circulating pump
C) Air cooler
D) Water cooler
E) Temperature gauge
B) Circulating pump
The foil bearings used in a microturbine are a type of ________ bearing.
A) Sleeve
B) Journal
C) Air
D) Antifriction
E) Water
C) Air
An electric starter rotates an internal combustion engine via a ring gear on the ____________.
A) Reducing gear
B) Flywheel
C) Governor
D) Driveshaft
E) Crankshaft
B) Flywheel
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
A) 3
B) 1,2
C) 2,4
D) 1,3,5
E) 1,2,3
D) 1,3,5
If compressed air is used to start an IC gen-set, the ___________ is a critical issue.
A) Shaft temperature
B) The battery voltage
C) Speed of rotation
D) Cylinder pressure
D) Cylinder pressure
For a micro-turbine combined heating system, which of the following statements is NOT true?
A) Fuel is added and ignited in a very rapid combustion process
B) The compressor discharges to the combustor
C) The rotating energy is transferred to the condenser and the alternator via a common shaft
D) The hot gases are allowed to expand through the gas turbine, creating rotational energy
E) Atmospheric air is drawn into an axial flow compressor where it is compressed
C) The rotating energy is transferred to the condenser and the alternator via a common shaft
