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20. An air compressor has an inlet air enthalpy of 35 Btu/lb and exit enthalpy of 70 Btu/lb. The mass flow of air is 3 lbs/s. If heat loss is 466.62 Btu/min, find the work input to the compressor. B. 149.51 hp C. 159.51 hp D. 169.51 Hp A. 139.51 hp 21. In an air standard Otto cycle, the clearance volume is 12% of the displacement volume. Find the compression ratio and or thermal efficiency. A. 0.52 B. 0.55 C. 0.53 D. 0.60 22. A Carnot cycle has a maximum temperature of 220°C and minimum temperature of 20°C. Find the cycle efficiency. A. 54.23% B. 58.35% C. 43.20% D. 40.57% 23. An engine has a bore of 15 cm and stroke of 48 cm. If the volumetric compression is 2200 cm³, find the engine efficiency. A. 46.2 B. 44.2 C. 45.4 D. 40.3 24. A Carnot engine requires 40 KJ/sec from the hot source. The engine produces 20 kw of power and the temperature of the sink is 26°C. What is the temperature of the hot source? A. 245.57°C B. 210.10°C C. 250.18°C D. 325.00°C 25. The maximum thermal efficiency possible for a power cycle operating between 1400°F and 280°F is: A. 58% D. 57.40% B. 58.73% C. 60.22% 26. A heat engine is operated between temperature limits of 1380 °C and 230°C. Engine supplied with 14,142 KJ per KWH. Find the Carnot cycle efficiency in percent. A. 70.10 B. 65.05 C. 67.56 D. 69.32 27. An air standard engine has a compression ratio of 15 and a cut-off ratio of 3. If the intake air pressure and temperature are 100 kpa and 28°C, find the work in KJ per kg. A. 2976 B. 2166 Page 2 C. 2437 D. 992.50 This Contents are no

20. An air compressor has an inlet air enthalpy of 35 Btu/lb and exit enthalpy of 70 Btu/lb. The mass flow of air is 3 lbs/s. If heat loss is 466.62 Btu/min, find the work input to the compressor. B. 149.51 hp C. 159.51 hp D. 169.51 Hp A. 139.51 hp 21. In an air standard Otto cycle, the clearance volume is 12% of the displacement volume. Find the compression ratio and or thermal efficiency. A. 0.52 B. 0.55 C. 0.53 D. 0.60 22. A Carnot cycle has a maximum temperature of 220°C and minimum temperature of 20°C. Find the cycle efficiency. A. 54.23% B. 58.35% C. 43.20% D. 40.57% 23. An engine has a bore of 15 cm and stroke of 48 cm. If the volumetric compression is 2200 cm³, find the engine efficiency. A. 46.2 B. 44.2 C. 45.4 D. 40.3 24. A Carnot engine requires 40 KJ/sec from the hot source. The engine produces 20 kw of power and the temperature of the sink is 26°C. What is the temperature of the hot source? A. 245.57°C B. 210.10°C C. 250.18°C D. 325.00°C 25. The maximum thermal efficiency possible for a power cycle operating between 1400°F and 280°F is: A. 58% D. 57.40% B. 58.73% C. 60.22% 26. A heat engine is operated between temperature limits of 1380 °C and 230°C. Engine supplied with 14,142 KJ per KWH. Find the Carnot cycle efficiency in percent. A. 70.10 B. 65.05 C. 67.56 D. 69.32 27. An air standard engine has a compression ratio of 15 and a cut-off ratio of 3. If the intake air pressure and temperature are 100 kpa and 28°C, find the work in KJ per kg. A. 2976 B. 2166 Page 2 C. 2437 D. 992.50 This Contents are no

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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20. An air compressor has an inlet air enthalpy of 35 Btu/lb and exit enthalpy of 70 Btu/lb. The mass flow of air is 3 lbs/s. If heat loss is 466.62 Btu/min, find the work input to the compressor. B. 149.51 hp C. 159.51 hp D. 169.51 Hp A. 139.51 hp 21. In an air standard Otto cycle, the clearance volume is 12% of the displacement volume. Find the compression ratio and or thermal efficiency. A. 0.52 B. 0.55 C. 0.53 D. 0.60 22. A Carnot cycle has a maximum temperature of 220°C and minimum temperature of 20°C. Find the cycle efficiency. A. 54.23% B. 58.35% C. 43.20% D. 40.57% 23. An engine has a bore of 15 cm and stroke of 48 cm. If the volumetric compression is 2200 cm³, find the engine efficiency. A. 46.2 B. 44.2 C. 45.4 D. 40.3 24. A Carnot engine requires 40 KJ/sec from the hot source. The engine produces 20 kw of power and the temperature of the sink is 26°C. What is the temperature of the hot source? A. 245.57°C B. 210.10°C C. 250.18°C D. 325.00°C 25. The maximum thermal efficiency possible for a power cycle operating between 1400°F and 280°F is: A. 58% D. 57.40% B. 58.73% C. 60.22% 26. A heat engine is operated between temperature limits of 1380 °C and 230°C. Engine supplied with 14,142 KJ per KWH. Find the Carnot cycle efficiency in percent. A. 70.10 B. 65.05 C. 67.56 D. 69.32 27. An air standard engine has a compression ratio of 15 and a cut-off ratio of 3. If the intake air pressure and temperature are 100 kpa and 28°C, find the work in KJ per kg. A. 2976 B. 2166 Page 2 C. 2437 D. 992.50 This Contents are no
Transcribed Image Text:20. An air compressor has an inlet air enthalpy of 35 Btu/lb and exit enthalpy of 70 Btu/lb. The mass flow of air is 3 lbs/s. If heat loss is 466.62 Btu/min, find the work input to the compressor. B. 149.51 hp C. 159.51 hp D. 169.51 Hp A. 139.51 hp 21. In an air standard Otto cycle, the clearance volume is 12% of the displacement volume. Find the compression ratio and or thermal efficiency. A. 0.52 B. 0.55 C. 0.53 D. 0.60 22. A Carnot cycle has a maximum temperature of 220°C and minimum temperature of 20°C. Find the cycle efficiency. A. 54.23% B. 58.35% C. 43.20% D. 40.57% 23. An engine has a bore of 15 cm and stroke of 48 cm. If the volumetric compression is 2200 cm³, find the engine efficiency. A. 46.2 B. 44.2 C. 45.4 D. 40.3 24. A Carnot engine requires 40 KJ/sec from the hot source. The engine produces 20 kw of power and the temperature of the sink is 26°C. What is the temperature of the hot source? A. 245.57°C B. 210.10°C C. 250.18°C D. 325.00°C 25. The maximum thermal efficiency possible for a power cycle operating between 1400°F and 280°F is: A. 58% D. 57.40% B. 58.73% C. 60.22% 26. A heat engine is operated between temperature limits of 1380 °C and 230°C. Engine supplied with 14,142 KJ per KWH. Find the Carnot cycle efficiency in percent. A. 70.10 B. 65.05 C. 67.56 D. 69.32 27. An air standard engine has a compression ratio of 15 and a cut-off ratio of 3. If the intake air pressure and temperature are 100 kpa and 28°C, find the work in KJ per kg. A. 2976 B. 2166 Page 2 C. 2437 D. 992.50 This Contents are no
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