Exam2_ME444_Fall07_B

Exam2_ME444_Fall07_B - ME 444 Exam 2 Form B October 11,...

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ME 444 Exam 2 Form B October 11, 2007 Open Notes Place answers in spaces provided. Name:________________________ PID:__________________________
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____ 1) In which operating condition does the exhaust manifold operate at the highest pressure? a) c) d) e) None of above conditions ____ 2) Which statement is NOT true? a) Early inlet valve closing increases volumetric efficiency at low speeds. b) Late inlet valve closing is only advantageous at very high speeds. c) Low valve lifts decreases volumetric efficiency only at very high speeds. d) Above a critical valve lift, lift is no longer affect volumetric efficiency remarkably. e) Valve lift does not affect volumetric efficiency at low speeds ____ 3) Which statement is true about engine cylinder pressure? a) P Exhaust (idle condition) P Exhaust (maximum torque condition) b) P Peak (maximum power condition) > P Peak (maximum torque condition) c) P Exhaust (maximum torque condition) P Exhaust (maximum power condition) d) P Intake (idle condition) > P Intake (maximum torque condition) e) P Peak (idle condition) P Peak (maximum torque condition) ____ 4) Which fuel causes more change in intake air partial pressure as fuel/air equivalent ratio decreases? a) C 8 H 18 b) C 3 H 8 c) C H 4 d) C H 3 OH e) H 2 ____ 5) In different operating conditions, which choice most accurately represents comparison of the thrust load amount on the major thrust side of the piston? a) maximum torque > maximum power > Idle b) maximum power > maximum torque > Idle c) Idle > maximum power > maximum torque d) Idle > maximum torque > maximum power e) Maximum power > Idle > maximum torque
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____ 6) What is the difference between Net Thermal Efficiency and Brake Thermal Efficiency? a) Mechanical Losses b) Flow Losses c) Pumping Losses d) Incomplete Combustion ____ 7) Pumping losses are caused by: a) Mechanical fuel pumps b) Flow losses across intake and exhaust systems c) Unequal fuel distribution between cylinders d)
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This note was uploaded on 01/29/2012 for the course ME 444 taught by Professor Staff during the Fall '08 term at Michigan State University.

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Exam2_ME444_Fall07_B - ME 444 Exam 2 Form B October 11,...

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