(a) Describe the operation and purpose of a diesel engine fuel nozzle.(6)
(b) State the defects diesel engine fuel nozzles may encounter during service.(4)
Study Notes MDE Unit 5 Q1 Quiz
(a) Sketch a section through the nozzle of a fuel injector, labelling the MAIN components.(6)
(b) Explain what is meant by EACH of the following terms:
(i) atomisation;(2)
(ii) penetration.(2)
Study Notes MDE Unit 5 Q2 Quiz
With reference to four stroke engines, explain the effects of EACH of the following:
(a) advanced fuel injection;(3)
(b) retarded fuel injection:(4)
(c) low compression pressure.(3)
Study Notes MDE Unit 5 Q3 Quiz
With reference to Bosch or jerk type fuel injection pumps:
(a) describe how the delivered quantity of fuel oil may be controlled;(6)
(b) explain the purpose of the delivery valve.(4)
Study Notes MDE Unit 5 Q4 Quiz
With reference to scroll type fuel injection pumps:
(a) describe how the delivered quantity of fuel may be varied:(5)
(b) explain the purpose of the delivery valve:(3)
(c) describe how fuel oil is prevented from spraying out if the high pressure pipe fails in service.(2)
Study Notes MDE Unit 5 Q5 Quiz
(a) Sketch a scroll type fuel pump, labelling the main components.(6)
(b) Explain how the pump sketched in part (a) may vary the end of delivery.(4)
Study Notes MDE Unit 5 Q6 Quiz
Explain, with the aid of labelled sketches, how a scroll type fuel pump meters the fuel for high and low loads.(10)
Study Notes MDE Unit 5 Q7 Quiz
Describe FIVE defects which may occur with main engine fuel injectors.(10)