B-07: Types Of Prime Movers And Heat Engines Flashcards
(20 cards)
R4B07-03-05-01 A cold weather cooling tower bypass valve should not be fully closed until the temperature reaches:
A. The compressor setpoint
B. The point at which drift stops
C. +5 C
D. About 27 C
D. About 27 C
Which type of engine converts heat energy to mechanical energy through repetitive thermodynamic operations ?
A. Gas
B. Diesel
C. Thermodynamic
D. Heat
D. Heat
R4B07-03-04-01 Water is removed from the air stream leaving a cooling tower, using:
A. Fill or packing
B. Desiccant
C. Cyclone separators
D. Drift eliminators
D. Drift eliminators
What is another name for a chimney tower ?
A. Drift eliminator
B. Parabolic tower
C. Hyperbolic tower
D. Cyclone separator
C. Hyperbolic tower
4B07-04-03-01 An arrangement of a steam system and a gas turbine, working as a single installation, is called a:
A. A combined cycle plant
B. A cogeneration system
C. A once-through system
D. A two-stage system
A. A combined cycle plant
R4B07-03-03-02 Excessive wind velocity in a natural draft cooling tower may cause:
A. Damaged louvres
B. High drift losses
C. Unstable sump water level
D. Over-cooling of the water
B. High drift losses
R4B07-05-03-04 Cylinder scavenging:
A. Refers to the flow of fuel air mixture into a diesel engine
B. Refers to the removal of exhaust gases from the cylinder
C. May be aided with air injectors to rapidly fill the cylinder
D. Is performed by a special piston ring that removes excessive oil from the cylinder walls
A. Refers to the removal of exhaust gases from the cylinder
R4B07-05-01-03 Internal combustion engines that drive gas compression machinery, and burn natural gas, operate on the ______ cycle.
A. Rotary
B. Variable heat
C. Two or four stroke
D. Brayton
C. Two or four stroke
When placed beside each other, which two types of blades in a reaction turbine create steam passages shaped like bent nozzles?
A. Stationary, rotary
B. Stationary, moving
C. Stationary, stationary
D. Moving bucket, stator
B. Stationary, moving
R4B07-05-02-02 An engineer that has one power stroke every second rotation of the crankshaft is a:
A. Two-stroke diesel engine
B. Four-stroke natural gas engine
C. Two-stroke gasoline engine
D. Double-acting engine
B. Four-stroke natural gas engine
When do high-speed automotive diesel engines run best?
A. When cooling water temperatures are near boiling point
B. When cooling water temperatures are near freezing point
C. When cooling water temperatures are near ambient temperature
D. When cooling water temperatures are lower
A. When cooling water temperatures are near boiling point
A starting device for a gas turbine:
A. Is necessary for all gas turbines
B. Is also called “barring gear”
C. Keeps rotating the turbine shaft until the turbine is up to full load
D. Must be an electric motor
A. Is necessary for all gas turbines
R4B07-02-01-06 The impulse works on the principle that:
A. Kinetic energy can be converted to mechanical energy
B. Steam expansion in the moving blades creates a force impulse
C. The high pressure creates an unbalanced forces on the blades
D. High velocity steam exerts force upon the rotating blades due to change in momentum
D. High velocity steam exerts force upon the rotating blades due to change in momentum
Asan advantage of gas turbines over other types of prime movers, is that gas turbines:
A. Need very little lubrication
B. Are reversible
C. Have high thermal efficiencies
D. Require little to no cooling water
D. Require little to no cooling water
What fuel is considered a clean alternative to other hydrocarbons ?
A. Natural gas
B. Heavy fuel oil
C. Gasoline
D. Light fuel oil
A. Natural gas
R4B07-02-01-03 The rotating passages of a reaction turbine are mounted on the:
A. Rotor
B. Shroud ring
C. Casing
D. Diaphragm
A. Rotor
Which type of energy comes from the wind and can be converted to mechanical energy using a wind turbine?
A. Chemical.
B. Potential
C. Kinetic
D. Solar
C. Kinetic
Why must a gas turbine be rotated at 20% to 30% of its maximum speed before turning on the fuel?
A. Because it has a starting motor
B. Because it is not self-starting
C. To increase its efficiency
D. To reduce fuel consumption
B. Because it is not self-starting
4B07-04-02-01 Some of the characteristics that make the gas turbine a better choice over other prime movers are:
A. It’s low power to weight ratio
B. It’s high thermal efficiency
C. Its ability to rapidly start and carry full load
D. It’s low fuel consumption
E. Increased power output at higher elevations
C. Its ability to rapidly start and carry full load
Which of the following is NOT an advantage of a gas turbine?
A. High power to weight ratio
B. Rapid start-up and loading
C. Limited types of fuel
D. Low installation cost
C. Limited types of fuel
