„ c) Prevents carbon build up. 349- In a compressor diffusion action takes place across: a) Rotors. b) Stators. „ c) Rotors and stators.
32 350- Fir tree turbine blade attachment locates the blade: a) radially b) axially „ c) allows slight movement 351- A factor that limits EGT is: „ a) turbine b) compressors c) jet pipe 352- Excessive EGT can: a) Cause damage to jet pipe. „ b) Cause damage to turbine. c) Cause NGV to creep. 353-Creep may occur to turbine blades due to: a) Prolonged low RPM use. „ b) Over-temp with excessive centrifugal loads. c) High back pressures. 354- Water/methanol solution is: „ a) de-mineralised water methanol depending on engine. b) Distilled water. c) Town water/methanol depending on engine. 355- Oil used in a gas turbine engine is usually: „ a) synthetic b) mineral c) natural 356- Pipes around engines are: a) Mild seamless steel. „ b) Stainless steel. c) aluminum. 357-Thrust changing with temperatures: „ a) will increase at low temperatures. b) will decrease at low temperatures. c) will increase at high temperatures. 358- Water/methanol is injected: a) At high temperature, at high altitudes. b) At high temperatures. „ c) At high temperatures or high altitudes. 359-Inlet side of a fuel pump has: „ a) Wire mesh filter. b) Wire wound filter. c) Threaded micron filter 360-Across the turbines: a) Turbines cause temperature rise. b) Isometric expansion takes place. „ c) Turbines cool. 361- Forces driving turbine are due to: „ a) momentum and directional acceleration of gases. b) Aerodynamic lift imposing impulse on blades. c) Expansion of gases.
33 362- Impulse turbine blades run cooler than reaction because: a) Impulse spin faster radially. b) Converging rotors Increase velocity. „ c) Temperature drop across NGV is greater. 363- When thrust is selected to Increase power, pressure drop across FCU: a) Drops. b) Remains the same. „ c) Increases. 364- Vane type oil pump output is controlled by: a) Output pressure controlling plate angle. b) Outlet pressure controlling servo. „ c) Outlet pressure against spring pressure. 365- The intake of a Gas Turbine Engine is designed to: a) Protect compressor from FOD. „ b) Provide turbulent free air. c) Provide streamlined fairing for aircraft. 366- Ways to test serviceability of a fixed fire bottle in situ are: a) Weigh, pressure, pop up indicator. „ b) Pressure, pop up indicator, blow-out disc. c) Weigh, pressure, blow-out disc. 367-An abraidable lining in the fan case: a) Prevents fan blade tip rub. b) Produces less leakage at tips for anti-ice. „ c) Provides acoustic medium. 368-Fibrous metallic lining for noise suppression is used: „ a) In hot area. b) In cold area. c) For lobe type noise suppressors. 369-Noise lining in the fan area is made from: a) Layers of bonded resin. „ b) Porous type Honeycomb and backing sheet. c) Felt with aluminum sheet. 370-An increase in turbine diameter is cause by: a) Over speed.
- Summer '17
- sajad heidari
- compressor, RPM, gas turbine engine, Axial compressor