An air compressor, 200 mm bore and 300 mm stroke, has a connecting rod 625 mm long. the reciprocating parts have a mass of 135 kg and the speed is 250 rev/min. when the crank is at 30° to the i. d.c and moving inwards, the pressure of the air is 840 kn/m2. the crank pin is 60 mm diameter. neglecting the effect of the mass of the connecting rod, determine: the rubbing velocity at the surface of the crank pin [0.95 m/s]the force on the crankshaft bearing [11.44 kn].the torque reaction on the frame [1.029 knm]. draw a clear sketch and explain the relevant steps.

Two technicians are discussing the intake air temperature (iat) sensor. technician a says that the computer uses the iat sensor as a backup to the engine coolant temperature (ect) sensor. technician b says that the powertrain control module (pcm) will subtract the calculated amount of fuel if the air measures hot. who is correct

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Most leaks in reciprocating air compressors can be detected and minimized by: (clo4) a)-detecting leakage areas using ultrasonic acoustic detector. b)-tightening joints and connections c)-replacing faulty equipment d)-all of the given options