Draw a typical DO curve for a BOD run at the following conditions.
a. Stream water, 20°C, dark
b. Unseeded sugar water, 20°C, dark
c. Stream water, 20°, with light
d. Stream water, 40°C, dark

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)

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.