Which of these fuel characteristics helps to prevent the air fuel mixture from spontaneously igniting in the combustion chamber?
Select one:
a. The ignition temperature
b. The cetane rating
c. The octane rating
d. The antiknock rating

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed