1-What are the routine maintenance schedule you suggest MONTHLY , YEARLY , for chilled water system ( chiller and pumps only )
2- D raw the refrigeration cycle the location and function of
*-Muffler *- Expansion *- Lp switch
*- Hp switch *– Flow switch *– L . Sol . Valve
*- Sight glass *- Compressor *Exp valve *-Filter drier

3- Draw sketch for chilled water system containinc,; 2 nos.water chillers, 2nos . water pumps, AHU ,with all accessories and fittings

4- What are the following CFC , HCFC , HFC , ( give example for each terms ), ASHRAE , UL , ARI , ASTM , NFPA, SMACNA , dB , wb ,dp, RH, NC, pH , BMS.

5- what are the new refrigerant to replace R22, R502 , what are the TYPE of oil to be used with them ?

6- what are the type of positive displacement and Dynamic compressors ? what is Hermatic , semihermatic compressor ?

7- How do you mean PUMP DOWN ? why how do you make it ?

8- Define : Refrigerant Flood back Slugging give how to correct ? When should we change compressor oil of chiller ?

9- what is the max value of superheat un water chiller system ? what are superheat adjustment benefits ? how to adjust superheat ?

10- How can we control refrigerant flow in the chiller coolers ( different types ) ?

11- What are capacity controls , safety controls , operating controls for chilled water system ?

12- Define for control system : Set point , control point control variable , BMS, VFD

13- What parameters to be controlled chemical treatment of chilled water , when we should chemicals ?

14- Give reasons for
I- Ice on compressor 2- ice on evaporator 3-compressor cycles
4- Hessing 5 - compressor trip on HPS or LPS
6- Less cooling 7- using expansion

15- What are the types of air Filters used in A/C ? give gravimetric efficiency for each type

16-what are the conditions to be satisfied to run two pumps in parallel Draw (H-O) curves indicate Duty points system resistance curve what will happen if on pump tripped out ?

17- What are methods of starting 3 phase motor ?
18 – Define : MCB , MCCB , MCC , RCCB , ELCB , 3PDT , relay LRA , RLA ,IP45

19- For 3- PHASE MOTOR –Y/D STARTER where to put OL , what is its setting Ampere?

20 –What are the insulation classes of the winding of A/C motor ?

21- Specify pump (with motor ) for drinking , water to lift 240 GPM against 150 FEET head ( what are motor KW ? ) Specify control panel ?

22- For a mosque of 1000 person , what are the under ground tank , over head tanks capacities , pump size , Draw – sketch for system ( pumps , tanks ) with all fittings and pipes

23- what is CAVATION in water pumps , WATER HANMMER in piping , describe how to void all ?

24 – You have chiller with multi compressor with unloaders ambient temperature goes up , chiller tripped on HPS , NO COOLING for the building WHAT YOU SHOULD DO ?

25 – State commissioning procedures for :
A- chilled water pumps B – 100 T water chiller

26-You have AUH supplying certain space , and you found that is no cooling at this space STAE PROCEDURES FOR CHECKING THE FAULT

27 – Sketch the following chilled water system indicate all components and fitting with utmost clarity the system consist of
A – Two chillers B- Tow chilled water pumps C – Four recirculated AHU distributed on for riser equality , T.C =20 TR each
D –Twelve FCU distributed on for riser equality T. C =50 MBH each .

28- Find
*- Capacity of each chiller ( T-R ) =
*_ Flow of the pump ( US . GMP) =
*_ Supply air CFM for AHU=
*_ Supply air CFM for FCU =
*_ (KW ) rating chiller =
*_(KW ) rating chiller pump =

Note:::
Ø Chilled water temp difference = 10 F
Ø Sensible heat factor AHU &FUC = 0.8
Ø On oil condition 76/63 F dh/ wb
Ø Of oil condition 58/56 F dh/wb
29- Name two methods of duct design

30 – Name four methods of capacity control

31- Indicate the range of the following design parameters for both residential & industrial application
*_ Friction rate ( inch of water per 100 Ft of duct )
*_ Air velocity inside duct ( Ft /min )
*_ water velocity inside chilled water pipes .

32 – Air Duct having a surface temperature of ( 15 c WB ) passes through a space at (32 c DB ) and ( 23c WB )
*_ Will the duct sweat ?
*_ Why

33- List the cases where you think duct insulation is not required ? ( for HVAC systems )

34- Describe the kind of pipe material and the pressure schedule adopted for use in the U.A.E. for the following application
*_ water supply ( cold , hot , internal , external , and under ground )
*_ Drainage ( soil , waste, storm , internal , external , laboratory, and under ground )
*_ Fire water supply (internal , external , and under ground )
*_ Chilled water refrigerate pipe .
*_ Medical cases .







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