The sound pressure level from a fan is measured to be 65 db at 3 m from the source. it can be assumed that the fan can be treated as a point source for the measurement. estimate the sound power of the fan if it is now placed in a 0.2 m x 0.2 m square duct. also, estimate the sound pressure level in the duct.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

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

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)