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Electrical QC Engineer Aramco Interview Questions
1. What is the minimum conductor size to be used for power and control cables below 600V?
a) 4mm2, 2 mm2 b) 2.5 mm2, 1.5 mm2 c) 6mm2, 4mm2,
2. What is the color coding for single phase AC power supply for control cabinets?
a) Black for Phase, white for Neutral, green for ground. b) Red for phase, Black for Neutral and white for Ground c) Yellow for phase, Black for Neutral and Green for ground.
3. What is the minimum depth of direct buried low voltage cable?
a) 610 mm b) 910 mm c) 750 mm
4. What is the maximum percentage of cross section a conduit can be filled containing three or more wires ?(If you don’t remember the exact figure specify the NEC Chapter and Table where this information available)
a) 40% fill over 2 wires. b) 53% fill over 2 wires. c) 60% fill over 2 wires
5. What is the insulation resistance test voltage for 600/1000V rated cable and minimum acceptable IR value?
a) 1000v, 50 mega ohms, b) 500v, 100 mega ohms, c) 5000 v, 150 mega ohms.
6. What is the minimum length of grounding rod?
a) 3 meter, b) 2.4 meter, c) 3.4 meter
7. What type of conduit must be used within Class 1 Zone 0/1 area?
a) Threaded rigid metal conduit. b) PVC conduit, c) EMT conduit
8. What is the minimum size of conduit Saudi Aramco required for electrical installation?
a) 1″ b) ¾” c) ½”
9. Compression terminal connectors for 4/0 and larger conductors shall be two hole NEMA design. Is this statement is TRUE or FALSE
10. What are the international codes dealing with cable tray manufacturing and installation?
a} NEMA VE1, NEMA VE2 b} IEC, c) IEEE
11. What is the unobstructed horizontal working space required in front of Switchgear?
a) 3 meters, b) 2 meters, c) 1.5 meters
12. Cable tray splice plates (joint) shall not be located over supports. Is this statement is TRUE or FALSE?
13. On electrical equipment being used in hazardous area you may see the letter UL or CSA, What do these abbreviations stands for?
14. What is the NEMA rating for electrical enclosures installed in the following environment?
Outdoor-, Corrosive Environment—.
15. What do the following letters denote on electrical equipment? EExd, IIB, T5
a) Explosion proof-type of protection, gas group, temperature grade. b) corrosive area, metal type, thickness of body, c) none of above.
16. How many degrees bend permitted in conduit run?
a) 270 degree, b) 360 degree, c} 180 degree
17. How Inspector can identify the hazardous area in a process plant? (specify the document)
a) Check list, b) classified drawing, c) cable schedule
18. Saudi Aramco no longer using the conduit seal fitting .What is the alternative that when a cable sealing is required per NEC in a classified area.
a} Barrier type cable glands {utilizing sealing compound}, b) unarmored cable glands, c) none of these
19. What is mean by Homerun cable?
a) Cable extending between the field JB and Marshaling cabinets in PIB or control buildings. b) cables from JB to JB. c) cables from equipment to JB.
20. What is the minimum signal separation required between a level 1 instruments signal and power circuit 240 AC less than 20 amps routed through the cable tray?
a) 150mm, b) 200mm, c) 300mm
21. What are the two grounding system required for instrumentation?
a) Safety ground, DC and shield, b) safety ground only, c) none of these
22. What is the acceptable ground resistance from the isolated instrument DC & Shield ground bus to the plant ground grid?
a} Less than 1 ohm, b) above 5 ohms, c) above 10 ohms
23. Is it acceptable to route Data link cables in the same conduit, duct or tray with other instrument cables?
a) No, b)Yes
24. What type of 125V single phase outlet that used for the construction activities at site?
a) Weather type, b) GFCI, C) Exptosion proof.
25. NEC low voltage cables shall be rated 600 V shall have a minimum temperature rating of 900 °C dry/750 C wet. rs this statement TRUE or FALSE?
26. NEC low voltage cables shall be rated 600 V shall have a minimum temperature rating of 90°C dry/ 75°C wet. Is this statement TRUE or FALSE?
27. Splices and terminations on cables rated above 1000 V shall be made by personnel certified in accordance with Saudi Aramco General Instruction —————. Fin up this Blank.
28. What is the minimum conductor size to be used for power cable if the voltage rating is 5 KV ?
29. What is the maximum size of conductor rated below 69 KV?
30. Compression terminal connectors for 4/0 and larger conductors shall be two hole NEMA design. Is this statement is TRUE or FALSE?
31. What kinds of compression (crimped) terminals can be used for control wiring?
32. What is the minimum creepage distance to ground for medium and high voltage terminations installed indoor?
33. Enclosures and Junction boxes having an internal volume exceeding————- shall be provided with type —–series stainless steel breather and drain fittings or a combination of breather and drain fittings. Fill up the blanks.
34. Cable Trays run vertically in outdoor areas shall have covers on both sides. Is this statement TRUE or FALSE?
35. Per Saudi Aramco standard what is the minimum separation between a 13.8 KV power cable and 120 V AC control cable?
ANSWERS:
1. 4 sq.mm, 2.5 sq.mm.
2. Phase-black and Neutral-white and Ground-green
3. 610 mm
4. 40% fill over 2 wires (NEC CHAPTER 9 ,TABLE 1).
5. 1000 V, 50 MEGA OHM
6. 2.4 METER
7. Threaded rigid metal conduit
8. ¾”
9. PVC Conduit type DB 120 per NEMA TC6&8 or NEMA TC2 type EPC 40 or PVC Coated rigid steel conduit.
10. NEMA VE1 , NEMA VE2
11. 2 Meters.
12. True
13. UL-Underwriters Laboratory. CSA- Canadian Standards Association.
14. Class I Div I Group A, Class I Zone !Group IIC
15. 4,4X
16. EEXD-Explosion proof, type of protection d, 118-Gas Group1 TS-Temperature Grade
17. 3.60 Degree.
18. Classified Area Drawing.
19. Barrier type Cable Glands (Utilizing sealing compound)
20. A cable typically multi-pair/triad extending between the field junction boxes and marshalling cabinets in control or PIB buildings.
21.150 mm
22. Safety Ground, Instrumentation DC & Shield Ground.
23. Less than 1 ohm
24. No
25. GFCI
26. True
27. Gl-0002.705
28.10 MM2 (8 AWG)
29. 500mm2(1000 kcmils)
30. True
31. Insulated ring tongue, locking fork tongue, flanged fork tongue and pin type
32. 25mm
33. 2000cm3, 300
34. True
35. 300mm