An eight-cylinder, four-stroke engine of 9 cm bore and 8 cm stroke with a compression ratio of 7 is tested at 4500 rev/min on a dynamometer which has 54 cm arm. During a 10 minutes test the dynamometer scale beam reading was 42 kg and the engine consumed 4.4 kg of gasoline having a calorific value of 44000 kJ/kg. Air at 27°C and 1 bar was supplied to the carburettor at the rate of 6 kg/min. Take R for air = 287 kJ/(kg·K). Find: (1) the brake power delivered (bp), (2) the brake mean effective pressure (bmep), (3) the brake specific fuel consumption (bsfc),

An eight-cylinder, four-stroke engine of 9 cm bore and 8 cm stroke with a compression ratio of 7 is tested at 4500 rev/min on a dynamometer which has 54 cm arm. During a 10 minutes test the dynamometer scale beam reading was 42 kg and the engine consumed 4.4 kg of gasoline having a calorific value of 44000 kJ/kg. Air at 27°C and 1 bar was supplied to the carburettor at the rate of 6 kg/min. Take R for air = 287 kJ/(kg·K). Find: (1) the brake power delivered (bp), (2) the brake mean effective pressure (bmep), (3) the brake specific fuel consumption (bsfc),

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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Concept explainers

Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.

Question

An eight-cylinder, four-stroke engine of 9 cm bore and 8 cm stroke with a compression
ratio of 7 is tested at 4500 rev/min on a dynamometer which has 54 cm arm. During a 10
minutes test the dynamometer scale beam reading was 42 kg and the engine consumed
4.4 kg of gasoline having a calorific value of 44000 kJ/kg. Air at 27°C and 1 bar was
supplied to the carburettor at the rate of 6 kg/min. Take R for air = 287 kJ/(kg·K). Find:
(1)
the brake power delivered (bp),
(2)
the brake mean effective pressure (bmep),
the brake specific fuel consumption (bsfc),
(3)
(4)
the brake specific air consumption (bsac),
(5)
the brake thermal efficiency (76, ih),
(6)
the volumetric efficiency (7vol), and
(7)
the air-fuel ratio (A/F) on mass basis.
Draw the simplified schematic diagram of the plant showing all the necessary data dis-
played on it.

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