An engineer has designed a valve that will regulate water
pressure on an automobile engine. The valve was tested
on 220 engines and the mean pressure was 5.8 lbs/square
inch. Assume the standard deviation is known to be
0.6. If the valve was designed to produce a mean
pressure of 5.7 lbs/square inch, is there sufficient evidence at
the 0.02 level that the valve does not perform to the
specifications?
An oil cooler for a large diesel engine is to cool engine oil
from 60 to 45 °C, using seawater at an inlet temperature of 20 °C
with a temperature rise of 15 °C. The design heat load is 140 kW,
and the mean overall heat transfer coefficient based on the outer
surface area of the tubes us 70 W/m2°C. Calculate the heat transfer
surface area for single pass (a)- counter flow and (b)- parallel
flow arrangements.
Question Identifying timing differences related to a bank reconciliation. For each timing difference listed, identify whether the difference would be reported on the book side of the reconciliation or the bank side. In addition, identify whether the difference would be an addition or subtraction.a. Deposit in transitb. Bank collectionc. Debit memorandum from bankd. EFT cash receipte. Outstanding checksf. $1,000 deposit erroneously recorded by the bank as $100g. Service chargesh. Interest revenuei. $2,500 cash payment for rent expense erroneously recorded by...
(30%) Q5. Composition of gas in diesel engine after combustion
engine is 5% oxygen, 20% carbon dioxide, 15% water vapor, and
remaining is nitrogen gas in volume. Temperature and pressure of
the gas is 1800K and 6 MPa. This gas is isentropically expanded to
the atmospheric pressure. Use air standard assumption.
a) Calculate the required properties of gas mixture (specific
heats, gas constant, etc.)
b) Calculate the power generated expansion for per kg of
mixture.
c) What is the temperature...
A diesel engine has a compression ratio of 19. The lowest pressure of the bike is 250 kPa, the lowest
the temperature is 180 ºC and the heat supply is 1200 kJ / kg.
(a) Draw a principle image of the engine. (1p)
(b) Draw a T-s and a P-v diagram with numbered points for the cycle (1p)
(c) Set up at least one table of given input for relevant points (1p)
The table can also be filled in with...
A Diesel engine with a compression ratio of 16 has a cutoff
ratio of 1.5. The state before polytropic compression (exponent
1.3) is 1700 cm3 , 96 kPa and 22°C and there is isentropic
expansion.
(a) Sketch the P-v diagram for this cycle.
(b) Calculate the heat transfer in and heat transfer out.
answer must be Qin = 657 J or 724 J or 866 J, Qout = 291 J or
296 J or
(c) Determine the thermal efficiency.
answer...
A Diesel engine with a compression ratio of 16 has a cutoff
ratio of 1.5. The state before polytropic compression (exponent
1.3) is 1700 cm3, 96 kPa and 22°C and there is isentropic
expansion.
(a) Sketch the P-v diagram for this cycle.
(b) Calculate the heat transfer in and heat transfer out.
(c) Determine the thermal efficiency.
(d) Calculate the mean effective pressure.