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TECHGEN-BNC-MODULE14
1.
Wear rate of a control rod spherical bearing is:
a) Progressive.
b) Unpredictable.
c) Constant.
d) Exponential.
2.
The replenishment of an oxygen bottle can be ensure by the: 1 - weight. 2 - pressure. 3 - level. 4 - volume. The combination containing all of the correct statements is:
a) 1 and 3 only.
b) 1 and 2 only.
c) 1 and 4 only.
d) 2 and 3 only.
3.
The vertical fin of a helicopter is often of asymmetric aerofoil section to:
a) Provide longitudinal stability in the hover.
b) Offset tail rotor loading in the hover.
c) Assist lateral control in forward flight.
d) Reduce engine power requirement in forward flight.
4.
Adjusting an outboard blade tab upwards will produce a:
a) nose down moment on the blade.
b) nose up moment on the blade.
c) medium frequency vibration in flight.
d) high frequency vibration in flight.
5.
A mixing unit in a flight control system:
a) Superimposes collective inputs onto cyclic inputs.
b) Is a link between the collective and cyclic roll channel to compensate for tail rotor roll.
c) Is a link between the collective and cyclic roll channel to compensate for tail rotor drift.
d) Superimposes collective inputs into the Yaw Channel to compensate for tail rotor drift.
6.
Friction controls are usually fitted to:
a) The cyclic control only.
b) Both collective and cyclic controls, but only the collective friction is adjustable in flight.
c) The collective control only.
d) Both collective and cyclic controls which are adjustable in flight.
7.
Low frequency vibration in the vertical plane which is only apparent in high speed flight is due to a:
a) badly adjusted tab on the main rotor blade
b) mass imbalance of the main rotor
c) mass imbalance of the tail rotor
d) badly adjusted rod on the main rotor blade
8.
The characteristics of a centrifugal compressor are: 1 - a high pressure ratio by stage. 2 - a large diameter. 3 - a low pressure ratio by stage. 4 - a small diameter. The combination containing all of the correct statements is:
a) 2 and 3 only.
b) 1 and 4 only.
c) 3 and 4 only.
d) 1 and 2 only.
9.
The main spar of a main rotor blade is at approximately:
a) 35% of the chord.
b) 25% of the chord.
c) 50% of the chord.
d) 45% of the chord.
10.
The purpose of the aluminium mesh which is manufactured within the skin of some fibre glass covered rotor blades is:
a) To form the shape of the blade and to allow the lay-up of the fibre glass skin.
b) To provide a superior bond between the skin and the foam core providing a strong rigid section.
c) To transfer flight loads to the skin.
d) To provide protection against lightning strikes.
11.
The inner surface of a heated windscreen is of:
a) Soft polycarbonate.
b) Glass.
c) Hard perspex.
d) Triplex.
12.
A force gradient unit is used to:
a) Prevent pilot inputs overriding auto-pilot inputs.
b) Transmit Stability Augmentation System (SAS) movement back to the control sticks.
c) Indicate the pitch angle on the rotor hub during rigging checks.
d) Add artificial feel into a hydraulically power flight control system.
13.
The cabin floor panels of a helicopter are usually manufactured from:
a) Sheet aluminium alloy.
b) Stainless steel or titanium sheet.
c) Aluminium, kevlar or nomex honeycomb sandwich.
d) Carbon fibre or kevlar sheet composite.
14.
Main rotor droop stops:
a) prevents engine power reducing below the requirements to sustain rotor RPM.
b) Prevents rotor droop in flight by ensuring the engine provides additional power immediately when required by the rotor.
c) Are inactive during flight.
d) Move to prevent the rotor disc drooping excessively during turbulent conditions preventing damage to the tail cone in flight.
15.
The characteristics of an axial compressor are: 1 - a low pressure ratio by stage. 2 - a high pressure ratio by stage. 3 - the possibility of compressing a large mass airflow. 4 - the inability of compressing a large mass airflow. The combination containing all of the correct statements is:
a) 2 and 3 only.
b) 1 and 4 only.
c) 1 and 3 only.
d) 2 and 4 only.
16.
Helicopter rotor blades are manufactured to a high degree of accuracy because:
a) the dynamic stability of the helicopter depends on it.
b) if the lift is not equal lateral vibration will be induced.
c) the static stability of the helicopter depends on it.
d) the weight, lift and balance of each blade must be equal.
17.
Erosion strips fitted to the leading edge of rotor blades are usually manufactured from the following alloys:
a) Nickel, Titanium or Stainless Steel.
b) Aluminium, Nickel or Titanium.
c) Tungsten, Nickel or Stainless Steel.
d) Aluminium, Titanium or Stainless Steel.
18.
To ensure the centre of pressure of a rotor blade acts through the centre of gravity, during manufacture:
a) Weights are located at the tip of the blade which are adjusted at manufacture to ensure the centre of gravity is in the correct location.
b) The aerofoil is designed to ensure the centre of pressure is in the correct location.
c) A weight is placed along the length of the blade, forward of the main spar.
d) Trim tabs are fitted to the tailing edge of the blade to adjust the centre of pressure.
19.
The replenishment of an onboard oxygen bottle must be done:
a) with a ground power unit connected, electrical power supplied.
b) with the engine(s) off.
c) with the engine(s) at idle.
d) with the engine(s) on.
20.
An electrically heated windscreen is manufactured from:
a) A glass and polycarbonate laminate.
b) A boron aluminide and glass laminate.
c) Triple glass sheets with the grain laid at 60° to each other.
d) A perspex and polycarbonate laminate with gold heating element.
21.
The purpose of the rotating scissors is to:
a) Transmit the drive from the main rotor gearbox to the main rotor hub.
b) Transmit the drive from the rotor hub to the fixed swashplate.
c) Transmit the drive from the rotor hub to the rotating swashplate.
d) Ensure that the rotating swashplate remains in contact with fixed swashplate.
22.
A delta three hinge is incorporated into some tail rotors to:
a) Automatically change the pitch angle as the tail rotor blade flaps.
b) Introduce pilot induced pitch change without the requirement of a swashplate.
c) Allow the tail rotor blade to flap and drag.
d) Maintain pilot control during auto rotation.
23.
Axial piston pumps are often used in hydraulic systems due to:
a) Their ability to produce high pressure combined with constant high flow rate.
b) Their low cost, simplicity and durability.
c) Their ability to produce high pressure when required but can be off loaded to reduce power consumption.
d) The safety feature of the quill drive shearing due to pump seizure and the ease of repair by replacement of pump and shaft only.
24.
The sand filter located at the air intake of a gas turbine engine:
a) reduces the efficiency of the air intake.
b) has an effect on the efficiency of the compressor only.
c) increases the efficiency of the air intake.
d) has no effect on the efficiency of the air intake.
25.
The purpose of the blade tip cap is: 1 - to reduce induced drag 2 - to increase the lift in hover 3 - to increase max air speed The combination containing all of the correct statements is:
a) 2, 3.
b) 1, 2, 3.
c) 1, 3.
d) 1, 2.
26.
The following anciliary systems may be powered from the main hydraulic system on a modern commercial helicopter: 1. Landing gear retraction. 2. Fuel heat. 3. Vibration tuner. 4. Blade fold. The combination grouping all of the correct statements is:
a) 1, 2, 3.
b) 1, 4.
c) 1, 3, 4.
d) 2, 3, 4.
27.
The rotor blades that are most sensitive to humidity, are those made of:
a) wood.
b) metal.
c) plastic.
d) composite materials.
28.
The ducted fan type tail rotor:
a) Uses an aerofoil shaped duct creating thrust.
b) Is chosen in design solely due to the safety reasons.
c) Is of simpler design and of a lower cost of manufacture than a traditional tail rotor.
d) Is mounted at the base of the fin allowing lighter supporting structure and to offset the fin to counter tail rotor drift.
29.
Wind gusts have a greater adverse effect on:
a) Rigid rotors due to the lack of a flapping hinge.
b) Semi-rigid rotors due to their see-saw flapping.
c) Fully articulated rotors as the gust will cause the blade to flap thus altering the pitch angle.
d) Fully articulated rotors as the flapping blades will induce vibration.
30.
The purpose of the fixed scissors is to:
a) Ensure the wheel remains correctly orientated to the Oleo leg in a landing gear.
b) Resist the rotational force applied to the lower swashplate in a rotorhead system.
c) Provide part of feedback mechanism in an auto-pilot system.
d) Act as the lower jaw of the cable cut device on a hoist.
31.
Engine compartment decking and firewalls are manufactured from:
a) Composite materials such as carbon, kevlar and fibre glass.
b) Stainless steel or titanium sheet.
c) Asbestos blankets.
d) Aluminium alloy sheet.
32.
The bimetal strip detectors of an engine fire detection system: 1 - are arranged in series. 2 - are arranged in parallel. 3 - open during a fire. 4 - close during a fire. The combination containing all of the correct statements is:
a) 1 and 4 only.
b) 2 and 3 only.
c) 1 and 3 only.
d) 2 and 4 only.
33.
The most difficult material from which to manufacture a homogeneous series of blades is:
a) metal.
b) composite materials.
c) plastic.
d) wood.
34.
The greatest risk created by a free turbine overspeed is:
a) a surge of the gas generator.
b) bursting of the free turbine disk.
c) creep of the turbine blades.
d) an engine overtemperature.
35.
In a free turbine engine, the energy delivered by the free turbine stages:
a) is not connected with the rotation speed of the generator.
b) is used to drive the compressor only.
c) is dependent on the rotational speed of the gas generator.
d) is used to drive the compressor and the main rotor gearbox.
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