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Answer:
the net work per cycle Btu per cycle
the power developed by the engine, W = 88.0144746 hp
Explanation:
the information given includes;
diameter of the four-cylinder bore = 3.7 in
length of the stroke = 3.4 in
The clearance volume = 16% = 0.16
The cylindrical volume
the crankshaft N rotates at a speed of 2400 RPM.
At the beginning of the compression , temperature = 60 F = 519.67 R
and;
Otto cycle with a pressure = 14.5 lbf/in² = (14.5 × 144 ) lb/ft²
= 2088 lb/ft²
The maximum temperature in the cycle is 5200 R
From the given information; the change in volume is:
the mass in air ( lb) can be determined by using the formula:
where;
R = 53.3533 ft.lbf/lb.R°
m = 0.0018962 lb
From the tables of ideal gas properties at Temperature 519.67 R
At state of volume 2; the relative volume can be determined as:
The specific energy at
is 184.7 Btu/lb
From the tables of ideal gas properties at maximum Temperature T = 5200 R
To determine the relative volume at state 4; we have:
The specific energy at
is 591.84 Btu/lb
Now; the net work per cycle can now be calculated as by using the following formula:
Btu per cycle
the power developed by the engine, in horsepower. can be calculated as follows;
In the four-cylinder, four-stroke internal combustion engine; the power developed by the engine can be calculated by using the expression:
where ;
N' = 1200 cycles/min
N' = 1200 cycles/60 seconds
N' = 20 cycles/sec
W = 4 × 20 cycles/sec × 0.777593696
W = 62.20749568 Btu/s
W = 88.0144746 hp
Answer:
a) The current in the heating element when it is connected to 120 V is 9.229 amperes, b) The power received by the heatng element connected to 120 V is 1107.522 watts.
Explanation:
a) The resistance as a function of voltage and power can be obtained from this expression, derived from the Ohm's Law:
Where:
- Source voltage, measured in volts.
- Heating element resistance, measured in ohms.
Now, resistance is clear and determined afterwards:
If and
, then:
Now, let consider that heating element is conected to a 120-V source. The power generated by this element is:
Besides, power as a function of current and resistance is given by this:
Where is the current required by the heating element, measured in amperes, and which is cleared herein:
If and
, then:
The current in the heating element when it is connected to 120 V is 9.229 amperes.
b) The power received by the heatng element connected to 120 V is 1107.522 watts. (see point a) for further details)
Answer:
The Mach number is 2.866
Total temperature To = 528.524K
Explanation:
Temperature (T) = 200K
For air, r= 1.4
To find the Mach number we use:
1.6426 = 0.2M^2
M = 2.866
To find Total Temperature :
To =528.524K