2A551 CDCs Volume 3 Of 3 Ure Questions Only

100 Questions | By Beede1984 | Updated: Mar 19, 2022 | Attempts: 1079

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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