Car Repairman Question:
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During compression stroke the air is compressed according to
a. Isothermal process
b. Hyperbolic process
c. Adiabatic process
d. Constant pressure process


c. Adiabatic process

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For diesel engines the nominal compression ratio is from
a. 17 to 21:1
b. 7.5 to 8.5:1
c. 30 to 40:1
d. 1 to 5:1
The duration of the fuel injection at full load in a diesel engine running at 1800 rpm when it has 200 of
crank travel is
a. 1/600 sec
b. 1/640 sec
c. 1/540 sec
d. 1/530 sec