1. If the intake air temperature of an 1.C. engine increases, its efficiency will: a) Increase b) Decrease c) Remain the same d) Cannot be predicted 2. For good volumetric efficiency, the Mach index Z should be: a) Greater or equal to 0.6 b) Less or equal to 0.6 c) Equal to the volumetric efficiency d) None of the above 3. Exhaust gas recirculation is a technique used to: a) Increase the thermal efficiency b) Reduce emissions c) Increase the volumetric efficiency d) Increase engine imep 4. The relation between Indicated mean effective pressure (imep), Friction mean effective pressure (fmep) and Brake mean effective pressure (bmep) is: a) fmep imep/bmep b) imep fmep+bmep c) imep bmep-fmep d) fmep imep/bmep 5. The most preferred mode of operation of engine lubricant is: a) Boundary mode b) Hydrodynamic mode b) Mixed mode d) None of the above 2/19 6. The ratio of the brake power to the indicated power is called: a) Overall efficiency b) Indicated thermal efficiency c) Mechanical efficiency d) Volumetric efficiency 7. The Otto cycle efficiency is: a) Lower than fuel-air cycle efficiency b) Equal to the fuel-air cycle efficiency c) Higher than fuel-air cycle efficiency d) Cannot be compared to the fuel-air cycle efficiency 8. A air-fuel mixture is called rich if: a) The air to fuel ratio is less than 1 b) The air to fuel ratio is greater than 1 c) The equivalence ratio is less than 1 d) The equivalence ratio is greater than 1 9. If a supercharger is connected to the engine crankshaft then: a) fmep imep-bmep+cmep b) imep fmep-bmep + cmep c) fmep imep+bmep-cmep d) fmep imep-bmep-cmep 10. The ratio of the Otto fuel air cycle efficiency to that of the actual cycle is around: a) 0.8 b) 0.2 c)5 d) 1.25 11. To improve the efficiency of spark ignition engines, it is better if we: a) Increase their theoretical efficiency b) Reduce their losses c) Increase the size of the engine d) Reduce the size of the engine 12. For intake mass flow into the cylinder, the stagnation or upstream conditions refer to: a) Conditions in the intake port b) Conditions in the cylinder c) Conditions of the ambient air d) None of the above
1. If the intake air temperature of an 1.C. engine increases, its efficiency will: a) Increase b) Decrease c) Remain the same d) Cannot be predicted 2. For good volumetric efficiency, the Mach index Z should be: a) Greater or equal to 0.6 b) Less or equal to 0.6 c) Equal to the volumetric efficiency d) None of the above 3. Exhaust gas recirculation is a technique used to: a) Increase the thermal efficiency b) Reduce emissions c) Increase the volumetric efficiency d) Increase engine imep 4. The relation between Indicated mean effective pressure (imep), Friction mean effective pressure (fmep) and Brake mean effective pressure (bmep) is: a) fmep imep/bmep b) imep fmep+bmep c) imep bmep-fmep d) fmep imep/bmep 5. The most preferred mode of operation of engine lubricant is: a) Boundary mode b) Hydrodynamic mode b) Mixed mode d) None of the above 2/19 6. The ratio of the brake power to the indicated power is called: a) Overall efficiency b) Indicated thermal efficiency c) Mechanical efficiency d) Volumetric efficiency 7. The Otto cycle efficiency is: a) Lower than fuel-air cycle efficiency b) Equal to the fuel-air cycle efficiency c) Higher than fuel-air cycle efficiency d) Cannot be compared to the fuel-air cycle efficiency 8. A air-fuel mixture is called rich if: a) The air to fuel ratio is less than 1 b) The air to fuel ratio is greater than 1 c) The equivalence ratio is less than 1 d) The equivalence ratio is greater than 1 9. If a supercharger is connected to the engine crankshaft then: a) fmep imep-bmep+cmep b) imep fmep-bmep + cmep c) fmep imep+bmep-cmep d) fmep imep-bmep-cmep 10. The ratio of the Otto fuel air cycle efficiency to that of the actual cycle is around: a) 0.8 b) 0.2 c)5 d) 1.25 11. To improve the efficiency of spark ignition engines, it is better if we: a) Increase their theoretical efficiency b) Reduce their losses c) Increase the size of the engine d) Reduce the size of the engine 12. For intake mass flow into the cylinder, the stagnation or upstream conditions refer to: a) Conditions in the intake port b) Conditions in the cylinder c) Conditions of the ambient air d) None of the above
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:1. If the intake air temperature of an 1.C. engine increases, its efficiency will:
a) Increase
b) Decrease
c) Remain the same
d) Cannot be predicted
2. For good volumetric efficiency, the Mach index Z should be:
a) Greater or equal to 0.6
b) Less or equal to 0.6
c) Equal to the volumetric efficiency
d) None of the above
3. Exhaust gas recirculation is a technique used to:
a) Increase the thermal efficiency
b) Reduce emissions
c) Increase the volumetric efficiency
d) Increase engine imep
4. The relation between Indicated mean effective pressure (imep), Friction mean effective pressure
(fmep) and Brake mean effective pressure (bmep) is:
a) fmep imep/bmep
b) imep fmep+bmep
c) imep bmep-fmep
d) fmep imep/bmep
5. The most preferred mode of operation of engine lubricant is:
a) Boundary mode
b) Hydrodynamic mode
b) Mixed mode
d) None of the above
2/19
6. The ratio of the brake power to the indicated power is called:
a) Overall efficiency
b) Indicated thermal efficiency
c) Mechanical efficiency
d) Volumetric efficiency
7. The Otto cycle efficiency is:
a) Lower than fuel-air cycle efficiency
b) Equal to the fuel-air cycle efficiency
c) Higher than fuel-air cycle efficiency
d) Cannot be compared to the fuel-air cycle efficiency
8. A air-fuel mixture is called rich if:
a) The air to fuel ratio is less than 1
b) The air to fuel ratio is greater than 1
c) The equivalence ratio is less than 1
d) The equivalence ratio is greater than 1
9. If a supercharger is connected to the engine crankshaft then:
a) fmep imep-bmep+cmep
b) imep fmep-bmep + cmep
c) fmep imep+bmep-cmep
d) fmep imep-bmep-cmep
10. The ratio of the Otto fuel air cycle efficiency to that of the actual cycle is around:
a) 0.8
b) 0.2
c)5
d) 1.25
11. To improve the efficiency of spark ignition engines, it is better if we:
a) Increase their theoretical efficiency
b) Reduce their losses
c) Increase the size of the engine
d) Reduce the size of the engine
12. For intake mass flow into the cylinder, the stagnation or upstream conditions refer to:
a) Conditions in the intake port
b) Conditions in the cylinder
c) Conditions of the ambient air
d) None of the above
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