A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at constant speed. The fuel supply ( m; ) is fixed at 0.0011333 kg/s and the spark plugs of the four cylinders are successively short circuited without change of speed, brake torque ( 7.) being correspondingly adjusted. The brake power (bp) measurements are the following: With all cylinders firing With cylinder No. 1 cut off With cylinder No. 2 cut off With cylinder No. 3 cut off With cylinder No. 2 cut off = 12.5 kW 9 kW 9.15 kW 9.2 kW 9.1 kW The lower calorific (or heating value, LCV;) of the fuel is 44100 kJ/kg. The clearance volume (Ve) of one cylinder 70.0x10³ mm³. Determine: (a) Indicated power (ip) of the engine under these conditions. (b) The indicated thermal efficiency (Mind, th). (c) The relative efficiency (7rel) of this engine.

A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at constant speed. The fuel supply ( m; ) is fixed at 0.0011333 kg/s and the spark plugs of the four cylinders are successively short circuited without change of speed, brake torque ( 7.) being correspondingly adjusted. The brake power (bp) measurements are the following: With all cylinders firing With cylinder No. 1 cut off With cylinder No. 2 cut off With cylinder No. 3 cut off With cylinder No. 2 cut off = 12.5 kW 9 kW 9.15 kW 9.2 kW 9.1 kW The lower calorific (or heating value, LCV;) of the fuel is 44100 kJ/kg. The clearance volume (Ve) of one cylinder 70.0x10³ mm³. Determine: (a) Indicated power (ip) of the engine under these conditions. (b) The indicated thermal efficiency (Mind, th). (c) The relative efficiency (7rel) of this engine.

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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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.

Question

A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at
constant speed. The fuel supply (m; ) is fixed at 0.0011333 kg/s and the spark plugs
of the four cylinders are successively short circuited without change of speed, brake
torque (4) being correspondingly adjusted. The brake power (bp) measurements are
the following:
With all cylinders firing
With cylinder No. 1 cut off
With cylinder No. 2 cut off
With cylinder No. 3 cut off
With cylinder No. 2 cut off = 9.1 kW
12.5 kW
9 kW
9.15 kW
9.2 kW
The lower calorific (or heating value, LCV) of the fuel is 44100 kJ/kg. The clearance
volume (Va) of one cylinder 70.0x10³ mm³. Determine:
(a) Indicated power (ip) of the engine under these conditions.
(b) The indicated thermal efficiency (Nind, th).
(c) The relative efficiency (7el) of this engine.

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