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! ! ! Set-6

Engine Fuel and metering

QuestionAnswer
1. One purpose of an air bleed in a float-type carburetor is to a. increase fuel flow at altitude. b. decrease fuel density and destroy surface tension. c. meter air to adjust the mixture. b
2. Idle cutoff is accomplished on a carburetor equipped with a back-suction mixture control by a. introducing low pressure (intake manifold) air into the float chamber. b. turning the fuel selector valve to OFF. c. the positive closing of a needle and seat. a
3. What is the purpose of an engine-driven fuel pump bypass valve? a. To prevent a damaged or inoperative pump from blocking the fuel flow of another pump in series with it. b. To divert the excess fuel from the pressure side of the pump to the inlet side of the pump. c. To divert the excess fuel back to the main tank. a
4. During idle mixture adjustments, which of the following is normally observed to determine when the correct mixture has been achieved? a. Fuel flowmeter. b. Changes in RPM or manifold pressure. c. Changes in fuel/air pressure ratio. b
5. Fuel lines are kept away from sources of heat, and sharp bends and steep rises are avoided to reduce the possibility of a. vapor lock. b. positive lock. c. liquid lock. a
6. Which statement is correct regarding a continuous-flow fuel injection system used on many reciprocating engines? a. Two injector nozzles are used in the injector fuel system for various speeds. b. Fuel is injected directly into each cylinder. c. Fuel is injected at each cylinder intake port. c
7. Where is the engine fuel shutoff valve usually located? a. Downstream of the engine-driven fuel pump. b. Aft of the firewall. c. Adjacent to the fuel pump. b
8. The density of air is very important when mixing fuel and air to obtain a correct fuel-to-air ratio. Which of the following weighs the most? a. 75 parts of dry air and 25 parts of water vapor. b. 50 parts of dry air and 50 parts of water vapor. c. 100 parts of dry air. c
9.At what engine speed does the main metering jet actually function as a metering jet in a float-type carburetor? a. All RPM's. b. All RPM's above idle range. - - c. Cruising RPM only. b
10. Which of the following best describes the function of an altitude mixture control? a. Regulates the richness of the fuel/air charge entering the engine. b. Regulates the air pressure in the venturi. c. Regulates the air pressure above the fuel in the float chamber. a
11. When trimming a turbine engine, the fuel control is adjusted to a. set idle RPM and maximum speed or EPR. b. allow the engine to produce maximum RPM without regard to power output. c. produce as much power as the engine is capable of producing. a
12. A supervisory electronic engine control (EEC) is a system that receives engine operating information and a. adjusts a standard hydromechanical fuel control unit to obtain the most effective engine operation. b. controls engine operation according to ambient temperature, pressure, and humidity. c. develops the commands to various actuators to control engine parameters. a
13. Fuel is discharged for idling speeds on a float-type carburetor a. through the idle discharge air bleed. b. in the venturi. c. from the idle discharge nozzle. c
14. Which of the following statements concerning a centrifugal-type fuel boost pump located in a fuel supply tank is NOT true? a. The centrifugal-type pump is classified as a positive displacement pump. b. Air and fuel vapors do not pass through a centrifugal-type pump. c. Fuel can be drawn through the impeller section of the pump when it is not in operation. a
15. What component is used to ensure fuel delivery during periods of rapid engine acceleration? a. Power enrichment unit. b. Acceleration pump. c. Water injection pump. b
16. What occurs when a back-suction type mixture control is placed in IDLE CUTOFF? a. The fuel passage to the idle jet will be closed by a valve. b. The float chamber will be vented to a negative pressure area. c. The fuel passages to the main and idle jets will be closed by a valve. b
17. The economizer system of a float-type carburetor performs which of the following functions? a. It supplies and regulates the fuel required for all engine speeds. b. It supplies and regulates the additional fuel required for all engine speeds above cruising. c. It regulates the fuel required for all engine speeds and all altitudes. b
18. If a float-type carburetor becomes flooded, the condition is most likely caused by a. a leaking needle valve and seat assembly. b. a clogged back-suction line. c. the accelerating pump shaft being stuck. a
19. A mixture ratio of 11:1 normally refers to a. 1 part fuel to 11 parts air. b. 1 part air to 11 parts fuel. c. a stoichiometric mixture. a
20. During engine operation, if carburetor heat is applied, it will a. decrease the air density to the carburetor. b. increase engine RPM. c. increase fuel/air ratio. a
21. A reciprocating engine automatic mixture control responds to changes in air density caused by changes in a. altitude only. b. altitude or humidity. c. altitude or temperature. c
22. What effect does high atmospheric humidity have on the operation of a jet engine? a. Has little or no effect. b. Decreases engine pressure ratio. c. Decreases compressor and turbine RPM. a
23. During what period does the fuel pump bypass valve open and remain open? a. When the fuel pump output is greater than the demand of the carburetor. b. When the boost pump pressure is greater than fuel pump pressure. c. When the fuel pump pressure is greater than the demand of the engine. b
24. What could cause a lean mixture and high cylinder head temperature at sea level or low altitudes? -- a. Mixture control valve fully closed. -- b. Defective accelerating system. -- c. Automatic mixture control stuck in the extended position. c
25. In turbine engines that utilize a pressurization and dump valve, the dump portion of the valve a. cuts off fuel flow to the engine fuel manifold and dumps the manifold fuel into the combustor to burn just before the engine shuts down. b. drains the engine manifold lines to prevent fuel boiling and subsequent deposits in the lines as a result of residual engine heat (at engine shutdown). c. dumps extra fuel into the engine in order to provide for quick engine acceleration during rapid throttle b
Created by: sampizzuto
 

 



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