1-Draw the curve which appears relation between the temperature and carbon range and define used for what ?
2-What happened to the properties of a piece of steel when it is heated to a temperature of a 1000 centigrade or more ?
3-Heat intensity is measured in terms of its ?
4-Heat quantity is measured with units of ?
5-what are the requirements of refrigerant ?
6-Draw the performance curve for centrifugal, axial and reciprocating pumps ?
7-Select the correct answer :
A-for a rotating unbalance shaft, which of the following has the greatest effect on its vibration :
*The magnitude of unbalance mass
*the shaft speed
*the distance between the center of rotation and unbalance mass
*the bearing clearance
B-which of the following could lead to surge in rotary compressor?
*decreasing the power of the driver
*reducing the compressor suction pressure
*increasing the compressor discharge pressure by increasing the resistance down-stream the compressor
*All of the above
C-How much is the pressure ratio in desiel engines?
*Between 6:1 and 14:1.
*Between 12:1 and 24:1
*Between 20:1 and 34:1
*Between 34:1 and 54:1
D-How much is the pressure ratio in spark ignition engines?
*Between 6:1 and 14:1
*Between 12:1 and 24:1
*Between 20:1 and 34:1
*Between 34:1 and 54:1
please i want these answers 