Answered: Define Mechanical Efficiency, Brake and…

Understanding Motor Controls

4th Edition

ISBN:9781337798686

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter30: Braking

Section: Chapter Questions

Problem 3RQ: Why are mechanical brakes often used on cranes?

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# About Vehicle Dynamics Make a summary about: Brake Systems. Introduction: History of the system, Definitions and Basic Principles. Citing the topics below (or the most relevant) The Brake System: Divisions and layout of hydraulic systems; Service Brake Components: Acting; Brake pedal; Brake booster set; Vacuum duct; Brake Fluid / Plumbing; Brake fluid; Pipes; Hydraulic brake hoses; Foundation – Disc brake; Brake stand; Friction materials; Brake disc; Foundation: Drum brake; Braking balancing; Performance: Valves, ABS and ESP and VAF; Parking/emergency brake; Braking distance; Thermal study; Regenerative Brake; Government requirements; Customer requirements; Laboratory and vehicle tests.
2) The indicated mean effective pressure is the of the brake mean effective pressure and the friction mean effective pressure. O sum O difference O product O ratio 3) Which ONE of the following statements is TRUE about specific power output? O It increases with increase in both BMEP and mean piston speed. O It decreases with increase in both BMEP and mean piston speed. O It increases with increase in BMEP and decrease in mean piston speed. O It increases with decrease in BMEP and increase in mean piston speed. 4) Which ONE of the following statements is TRUE about a lean fuel-air mixture? O Its equivalence ratio and excess air ratio are both greater than one. O Its equivalence ratio and excess air ratio are both lower than one. O Its equivalence ratio is lesser than one and its excess air ratio is greater than one. O Its equivalence ratio is greater than one and its excess air ratio is lesser than one. 5) Which one of the following increases the indicated mean effective pressure of the…
Brake Specific Fuel Consumption - 0.3 kg/kwh Mechanical Efficiency- 90% Calorific Value of Fuel - 45 MJ/kg Given these values, find the indicated power, indicated thermal efficiency and brake thermal efficiency
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b) A gasoline engine is specified to be 4-stroke and four-cylinder. It has a bore of 80 mm and a stroke of 100 mm. On test it develops a torque of 75 N.m when running at 3000 rpm. If the clearance volume in each cylinder is 60 cm², the relative efficiency is 0.5 and the calorific value of the fuel is 42 MJ/kg; determine the brake thermal efficiency. Root wicl

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Define Mechanical Efficiency, Brake and Indicated thermal efficiency