An Otto cycle with a compression ratio of 7.5 operates from the suction conditions of 14.2 psia, 85 F Find the pressure and temperature at the end of compression, a) if cold air (k-1.4) is the working substance, b) if hot air (k-1.32) is the working substance.

Elements Of Electromagnetics
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1. An Otto cycle with a compression ratio of 7.5 operates from the suction conditions of 14.2 psia, 85 F Find the pressure and temperature at the end of compression, a) if cold air (k-1.4) is the working substance, b) if hot air (k-1.32) is the working substance. 

2. An ideal Otto engine, operating on the hot-air standard with k-1.34, has a compression ratio of 5. At the beginning of compression the volume is 12 m², the pressure is 95 kPaa and temperature is 38 °C. During constant volume heating, 370 kJ are added per cycle. Compute T₁, P, T, Qa, Qr, Wnet, thermal Efficiency, and mean effective pressure. 

3. An ideal Diesel engine operates on 1.5 lb of air with a suction state at 14.1 psia and 100 F. The pressure at the end of compression is 475 psia and the cut-off is 6% of the stroke from head-end dead - center. Using air properties (R-53.34 ft-lbf/lbm-R, k-1.4, Cp 24, Cvs. 1714 Btu/lbm-R), determine compression ratio, percentage clearance, Qa, Qr, Thermal Efficiency, mean effective pressure. 

4. There are supplied 320 KJ/cycle of Diesel engine operating on 250 g of air P-97.91 KPa, T-48.9C. At the end of compression, -3930KPa. Assume that air and the product within the cycle have air properties. Determine compresion ratio, cut-off ratio, Wnet, thermal efficiency, and mean effective pressure. 

5. For an ideal Diesel cycle with the over-all value of k=1.33, rk-15, rc-2.1, P, 14.2031 psia, find P, and mean effective pressure. 

6. The working substance for a Carnot cycle is 8 lb of air. The volume at the beginning of isothermal compression is 9 ft' and the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90 F. Find: a) Q, and Q. (BTU), b) V, and P₁, c) V. and P., d) mean effective pressure (psia). 

PROBLEMS:
1. An Otto cycle with a compression ratio of 7.5 operates from the suction conditions of 14.2 psia, 85 °F.
Find the pressure and temperature at the end of compression, a) if cold air (k=1.4) is the working
substance, b) if hot air (k=1.32) is the working substance. (20 pts)
2. An ideal Otto engine, operating on the hot-air standard with k=1.34, has a compression ratio of 5. At
the beginning of compression the volume is 12 m³, the pressure is 95 kPaa and temperature is 38 °C.
During constant – volume heating, 370 kJ are added per cycle. Compute T3, P3, T4, Qa, Qr, Wnet,
thermal Efficiency, and mean effective pressure. (30 pts)
3. An ideal Diesel engine operates on 1.5 Ib of air with a suction state at 14.1 psia and 100 °F. The
pressure at the end of compression is 475 psia and the cut -off is 6% of the stroke from head -end
dead - center. Using air properties (R=53.34 ft-Ibf/lbm-R, k=1.4, Cp =.24, Cv=.1714 Btu/lbm-R),
determine compression ratio, percentage clearance, Qa, Qr, Thermal Efficiency, mean effective
pressure. (30 pts)
4. There are supplied 320 KJ/cycle of Diesel engine operating on 250 g of air P,=97.91 KPa, T,=48.9C.
At the end of compression, P2 =3930KPa. Assume that air and the product within the cycle have air
properties. Determine compresion ratio, cut-off ratio, Wnet, thermal efficiency, and mean effective
pressure. (25 pts)
5. For an ideal Diesel cycle with the over-all value of k=1.33, rk=15, rc=2.1, P,= 14.2031 psia, find P, and
mean effective pressure. (20 pts)
6. The working substance for a Carnot cycle is 8 lb.m of air. The volume at the beginning of isothermal
compression is 9 ft and the pressure is 300 psia. The ratio of expansion during the addition of heat is
2 and the temperature of the cold body is 90 °F. Find: a) Qa and QR (BTU), b) V, and P3, c) V, and P,, d)
mean effective pressure (psia). (35 pts)
Transcribed Image Text:PROBLEMS: 1. An Otto cycle with a compression ratio of 7.5 operates from the suction conditions of 14.2 psia, 85 °F. Find the pressure and temperature at the end of compression, a) if cold air (k=1.4) is the working substance, b) if hot air (k=1.32) is the working substance. (20 pts) 2. An ideal Otto engine, operating on the hot-air standard with k=1.34, has a compression ratio of 5. At the beginning of compression the volume is 12 m³, the pressure is 95 kPaa and temperature is 38 °C. During constant – volume heating, 370 kJ are added per cycle. Compute T3, P3, T4, Qa, Qr, Wnet, thermal Efficiency, and mean effective pressure. (30 pts) 3. An ideal Diesel engine operates on 1.5 Ib of air with a suction state at 14.1 psia and 100 °F. The pressure at the end of compression is 475 psia and the cut -off is 6% of the stroke from head -end dead - center. Using air properties (R=53.34 ft-Ibf/lbm-R, k=1.4, Cp =.24, Cv=.1714 Btu/lbm-R), determine compression ratio, percentage clearance, Qa, Qr, Thermal Efficiency, mean effective pressure. (30 pts) 4. There are supplied 320 KJ/cycle of Diesel engine operating on 250 g of air P,=97.91 KPa, T,=48.9C. At the end of compression, P2 =3930KPa. Assume that air and the product within the cycle have air properties. Determine compresion ratio, cut-off ratio, Wnet, thermal efficiency, and mean effective pressure. (25 pts) 5. For an ideal Diesel cycle with the over-all value of k=1.33, rk=15, rc=2.1, P,= 14.2031 psia, find P, and mean effective pressure. (20 pts) 6. The working substance for a Carnot cycle is 8 lb.m of air. The volume at the beginning of isothermal compression is 9 ft and the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90 °F. Find: a) Qa and QR (BTU), b) V, and P3, c) V, and P,, d) mean effective pressure (psia). (35 pts)
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