Volume 2 - 2014 2A651 CDC

88 Questions | By AustinCope | Updated: Mar 20, 2022 | Attempts: 178

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1.

(201) An aircraft taxiing at a steady speed can be used to demonstrate
- A.
  
  Bernoulli’s principle.
- B.
  
  Newton’s first law of motion.
- C.
  
  Newton’s second law of motion.
- D.
  
  Newton’s third law of motion.
2.

(201) Newton’s third law of motion explains why an operating jet engine produces
- A.
  
  Forward thrust.
- B.
  
  Forward acceleration.
- C.
  
  Increased acceleration.
- D.
  
  Decreased acceleration.
3.

(201) Which type of duct would decrease the velocity and increase the pressure of a gas as it passes through?
- A.
  
  Elbow.
- B.
  
  Straight.
- C.
  
  Divergent.
- D.
  
  Convergent.
4.

(201) "The combination of decreased pressure above an airfoil, and the increased pressure below the airfoil produces lift" is best described by
- A.
  
  Bernoulli’s principle.
- B.
  
  Newton’s first law of motion.
- C.
  
  Newton’s second law of motion.
- D.
  
  Newton’s third law of motion.
5.

(202) Foot-pounds and inch-pounds are units of measure for
- A.
  
  Work.
- B.
  
  Power.
- C.
  
  Inertia.
- D.
  
  Friction.
6.

(202) What does fuel for an engine represent?
- A.
  
  Available horsepower.
- B.
  
  Thrust produced.
- C.
  
  Potential energy.
- D.
  
  Efficiency ratio.
7.

(203) Which section of a jet engine continually supplies air and maintains pressure?
- A.
  
  Turbine.
- B.
  
  Diffuser.
- C.
  
  Compressor.
- D.
  
  Combustion.
8.

(203) The temperature of compressed air in a jet engine must be raised to
- A.
  
  Increase energy.
- B.
  
  Decrease energy.
- C.
  
  Increase volume.
- D.
  
  Decrease volume.
9.

(203) Which section of a jet engine introduces and burns fuel?
- A.
  
  Turbine.
- B.
  
  Diffuser.
- C.
  
  Compressor.
- D.
  
  Combustion.
10.

(204) How many British thermal units (Btu) does the heat content per pound of kerosene produce?
- A.
  
  10,500.
- B.
  
  15,000.
- C.
  
  18,500.
- D.
  
  40,000.
11.

(204) The efficiency of a jet engine is often referred to as
- A.
  
  Energy.
- B.
  
  Momentum.
- C.
  
  Thermal efficiency.
- D.
  
  Propulsive efficiency.
12.

(204) The product of thermal efficiency and propulsive efficiency is
- A.
  
  Mechanical efficiency
- B.
  
  Overall efficiency
- C.
  
  Power efficiency
- D.
  
  Thrust efficiency
13.

(205) To measure barometric pressure, you would use a
- A.
  
  Potentiometer.
- B.
  
  Potentiometer.
- C.
  
  Pyrometer.
- D.
  
  Barometer
14.

(205) What effect does moisture content or humidity have on density of air?
- A.
  
  More moisture, more dense
- B.
  
  More moisture, less dense
- C.
  
  Less moisture, less dense
- D.
  
  None.
15.

(205) Due to the divergent design of a diffuser, air pressure
- A.
  
  Remains the same
- B.
  
  Fluctuates.
- C.
  
  Decreases.
- D.
  
  Increases.
16.

(205) The air temperature of a jet engine gradually rises across the compressor to the diffuser outlet as a result of
- A.
  
  Compression.
- B.
  
  Fuel expansion.
- C.
  
  Turbine discharge.
- D.
  
  Ambient temperature increase.
17.

(205) Where is the highest point of temperature reached in an engine?
- A.
  
  Tailpipe.
- B.
  
  Exhaust cone.
- C.
  
  Turbine section.
- D.
  
  Combustion section.
18.

(206) Which engine component meters fuel for combustion?
- A.
  
  Pressure and drain (P&D) valve.
- B.
  
  Fuel control.
- C.
  
  Fuel nozzle.
- D.
  
  Fuel pump.
19.

(206) What happens to the energy that is absorbed by the turbine wheel?
- A.
  
  50 percent is used for accessories.
- B.
  
  60 percent is used for accessories.
- C.
  
  It is returned to the compressor.
- D.
  
  It operates the anti-ice system.
20.

(207) What is the required velocity for air and gases flowing through a jet engine?
- A.
  
  Low velocity at all times.
- B.
  
  Less velocity exiting than entering.
- C.
  
  Equal velocity entering and exiting.
- D.
  
  Greater velocity exiting than entering.
21.

(207) The velocity of the stream of air that flows through a jet engine reaches its highest point at the
- A.
  
  Ejector nozzle.
- B.
  
  Combustion section.
- C.
  
  Turbine exhaust cone.
- D.
  
  Turbine stator (nozzle diaphragm).
22.

(207) What is the general flow of gases from the combustion chamber?
- A.
  
  At right angles to the rotor shaft.
- B.
  
  Parallel to the axis of the rotor shaft.
- C.
  
  At the same velocity as the rotor shaft.
- D.
  
  In a reverse direction from the rotor shaft.
23.

(207) Gases enter the jet-engine’s first-stage turbine wheel blades from the
- A.
  
  Turbine wheel blades.
- B.
  
  Combustion chamber.
- C.
  
  Turbine stator.
- D.
  
  Flameholder.
24.

(207) When two or more turbine wheels are used in a jet engine, which component is placed directly in front of each turbine wheel?
- A.
  
  Diffuser.
- B.
  
  Jet nozzle.
- C.
  
  Combustion chamber.
- D.
  
  Turbine stator (nozzle diaphragm).
25.

(208) A jet engine derives its name from its design in that it uses
- A.
  
  An exhaust-gas-driven turbine wheel to drive its compressor.
- B.
  
  Nozzles which are called jet within the engine.
- C.
  
  A turbine-type compressor to maintain power.
- D.
  
  Turbo-superchargers within the engine.