Using a Dyno-mite dynamometer in a Chevrolet 4.3-liter V6
Engine, Explain how fuel consumption,brake thermal efficiency,...
Using a Dyno-mite dynamometer in a Chevrolet 4.3-liter V6
Engine, Explain how fuel consumption,brake thermal efficiency, and
brake specific fuel consumption vary with load, speed, and coolant
water temperature.
The fuel efficiency of an aircraft’s jet engines is described by the thrust-specific fuel consumption (TSFC). The TSFC measures the rate of fuel consumption (mass of fuel burned per unit time) relative to the thrust (force) that the engine produces. In that manner, even if an engine consumes more fuel per unit time than a second engine, it is not necessarily more inefficient if it also produces more thrust to power the plane. The TSFC for an early hydrogenfueled jet...
An ideal diesel engine uses air as the working fluid and operates
with a thermal efficiency ?th =0.5 with a rate of heat addition
Qin=120 kW. The temperature at the beginning and the end of the
addition heat (combustion) are respectively: T2=900 K and T3=2100
K. Assume constant specific heats (Cp and Cv). The air properties
at a room temperature T1=293.0 K are: Cp=1.005 kJ/kg.K,
Cv=0.718KJ/kg.K, the gas constant of air is R=0.287 kJ/kg.K and the
ratio of specific heats...
Explain how, in the absence of market failures, efficiency as
part of allocative efficiency in consumption is achieved.
Explain, in the absence of market failures, efficiency in
production (as part of allocative efficiency) is achieved
Explain, and support graphically, the Coase theorem and specify
the conditions necessary for it to hold
A gasoline engine has a power output of 150 kW. If its thermal
efficiency is 33%, how much heat must be supplied to keep the
engine running for 18 s to reach the end of a street? (in J) (Note:
express your answer in scientific notation, for instance: 3.14
An in-line, six-cylinder, 6.6-liter, four-stroke cycle
SI engine with multipoint port fuel injection operates át 3000 RPM,
with a volumetric efficiency of 89% and AF of
15:1. The engine has bore and stroke'related by S = 0.90 B. The
engine has an exhaust pipe between engine and catalytic converter
that can be approximated as a round pipe, 1.5 m long and 6.5 cm
inside diameter. Exhaust temperature leaving the engine is 477°C,
and the average wall temperature of the exhaust...
We are interested in predicting the fuel efficiency (gasoline
mileage in mpg) using the weight of a vehicle in pounds. A random
sample of 12 vehicles is taken. The Excel output is given below.
Use the output and the fact that R2 = 0.640 to answer the following
questions. Coefficients Standard Error t Stat P-value Lower 95%
Upper 95% Intercept 48.409 5.978 8.098 0.000 35.089 61.728 Weight
-0.006 0.002 -4.214 0.002 -0.010 -0.002 Interpret the slope in
context. Find and...
For an electrical
power plant of your choice:
(a) How would the
thermal efficiency change if T-Low were decreased by one degree
while keeping T-High constant? Assume Carnot cycle.
(b) How would the
change in the thermal efficiency (resulting from the lower T-Low)
affect W-net? Assume a thermal efficiency of 32.5 % and a capacity
factor of 100 %, and give your answer in kWh per year.
(c) What would the
difference in revenue (in $) be per year? Take...
1) Explain how different engine operating conditions affect
combustion ( ignition delay, temperatures, air fuel ratio, speed,
heat transfer)?
2) What are the 3 sources of NOX formation, which is the least
relevant, which is the most relevant, explain why?
What is the efficiency of the most efficient combustion engine?
Explain why it is so inefficient. How does the efficiency of an
electric motor compare with an internal combustion engine? If this
were the selling feature for an electric car, explain why this is
terribly misleading.