2A551 CDCs Volume 3 Of 3 Ure Questions Only
- 1.It is important to raise the air temperature in a jet engine to
- A.
Increase its energy
- B.
Decrease its energy
- C.
Decrease its volume
- D.
Increase its efficiency
- 2.In a jet engine, the velocity of the air is decreased by the
- A.
Diffuser
- B.
Afterburner
- C.
Compressor
- D.
Turbine blades
- 3.An aircraft taxiing at a constant speed is an example of
- A.
Bernoulli's Law
- B.
Newton's First Law of Motion
- C.
Newton's Second Law of Motion
- D.
Newton's Third Law of Motion
- 4.Foot-pounds and inch-pounds are units of measure for
- A.
Work
- B.
Power
- C.
Inertia
- D.
Friction
- 5.The resistance of an object to change its motion is a property of matter called
- A.
Energy
- B.
Inertia
- C.
Friction
- D.
Potential
- 6.The ability to do work is the definition of
- A.
Energy
- B.
Inertia
- C.
Friction
- D.
Velocity
- 7.In a jet engine, fuel is metered for combustion by the
- A.
Pressurizing and dump (P&D) valve
- B.
Fuel nozzles
- C.
Fuel control
- D.
Fuel pump
- 8.The average percentage of a jet engine's energy required to maintain engine operation is
- A.
50
- B.
60
- C.
70
- D.
80
- 9.What effect does the divergent design of a jet engine diffuser have on pressure?
- A.
Increases pressure
- B.
Decreases pressure
- C.
Results in pressure fluctuations
- D.
Has minimum effect on pressure
- 10.The required velocity for air and gases flowing through a jet engine is
- A.
Low velocity at all times
- B.
Less velocity exiting than entering
- C.
Equal velocity entering and exiting
- D.
Greater velocity exiting than entering
- 11.The velocity of the stream of air that flows through a jet engine reaches its highest point at the
- A.
Turbine stator (nozzle diaphragm)
- B.
Turbine exhaust cone
- C.
Combustion section
- D.
Ejector nozzle
- 12.When two or more turbine wheels are used in a jet engine, what is placed directly in front of each turbine wheel?
- A.
Diffuser
- B.
Jet nozzle
- C.
Combustion liner
- D.
Nozzle diaphragm
- 13.A jet engine derives its name from the fact that
- A.
It is in effect a turbo-supercharger
- B.
The nozzles within the engine are called jets
- C.
It uses a turbine-type compressor to maintain power
- D.
It uses a exhaust-gas-driven turbine wheel to drive its compressor
- 14.The three major sections of all jet engines are compressor, combustion, and
- A.
Turbo
- B.
Turbine
- C.
Exhaust
- D.
Diffuser
- 15.The condition that rapidly reduces the efficiency of a centrifugal jet engine compressor would be
- A.
Resultant velocity
- B.
Tangential velocity
- C.
Pressure pulsations
- D.
Air mass leaving the impeller at great velocities
- 16.The type of engine that is cheaper to manufacture is the
- A.
Axial-flow because of size
- B.
Centrifugal because of size
- C.
Axial-flow because of fewer parts
- D.
Centrifugal because of fewer parts
- 17.The percentage of combustion efficiency of a gas turbine is usually between
- A.
60 and 70
- B.
65 and 75
- C.
75 and 95
- D.
95 and 100
- 18.The term "combustion range" is defined as a jet engine's
- A.
Steady-state zone
- B.
Pressure-ratio zone
- C.
Compressor stall zone
- D.
Operating temperature zone
- 19.The most chemically correct ratio for burning fuel in a combustion chamber is
- A.
10:1
- B.
10:4
- C.
15:1
- D.
15:4
- 20.The inner and outer surfaces of an annular-type combustion chamber are formed by
- A.
Interlocking stainless steel bands
- B.
The inner and outer diffuser case
- C.
A forged steel casing
- D.
Solid sheet metal
- 21.The most common type of fuel nozzle system is the
- A.
Pressure-atomizing
- B.
Fuel-blasting
- C.
Fuel ejector
- D.
Fuel tube
- 22.Swirl-type fuel nozzles are usually used to provide what type of flame speed?
- A.
Low
- B.
High
- C.
Medium
- D.
Medium-high
- 23.The three design types of turbines used in jet engines are
- A.
Shrouded, unshrouded, and fir tree
- B.
Shrouded, unshrouded, and corrugated
- C.
Impulse, reaction, and reaction-impulse
- D.
Impeller, impulse, reaction-impulse
- 24.On some jet engines, the turbine bucket is secured in place by
- A.
Screws
- B.
Cables
- C.
Lockwire
- D.
Lock strips
- 25.The purpose of the exhaust duct is to
- A.
Swirl exhaust gas-flow
- B.
Equalize exhaust gas-flow
- C.
Modulate exhaust gas-flow
- D.
Straighten exhaust gas-flow
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