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Internal Combustion Engines |
Mock Exam 1 (1427-1428) 2nd semester |
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Student Name: |
Student Number: - - ( ) |
1- A) What are the
differences between the following:
i- Indicated power & Brake power
ii- Jet valve & Auxiliary valve
B) Write down two methods to measure the engine indicated power.
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C) i- Write down the names of three parts in the engine cylinder block and their functions
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Part name |
Function |
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1 |
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2 |
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3 |
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ii- How the engine power can be increased?
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D) Complete the following table
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Engine cooling systems |
Advantages |
Disadvantages |
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1 |
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- |
- |
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2 |
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- |
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2- A) Place the following on the
chart:
a- The engine strokes
b- TDC and BDC locations
c- Crank shaft angles
d- Cam shaft angles
e- Maximum pressure
B) What are the units of the following physical quantities?
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Engine specific fuel consumption |
Brake mean effective pressure |
Engine Torque |
Engine volumetric efficiency |
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C) Which engine has less fuel consumption? and why?
i- Engine A consumes fuel as (2.1 kg/h) or
ii- Engine B consumes fuel as (3.2 L/h) if fuel density d= 0.7 kg/L
D) A four stroke engine has four cylinders, the cylinder bore is 100 mm and the stroke is 110 mm. When the engine is Morse tested it gives the following results at 4000 rpm. Find:
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Disconnected Cylinder |
Pb (kW) |
Pi (kW) for cylinders |
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None |
65.8 |
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No. 1 |
51.8 |
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No. 2 |
51.6 |
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N0. 3 |
52.9 |
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N0. 4 |
52.5 |
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The engine Pi (kW) |
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A- The indicated power Pi
B- The friction power Pf
C- The mechanical efficiency hm
D- Engine swept volume,
E- Engine bore/stroke ratio (is it over-square engine or under-square engine?)
F- Engine torque.