Part-03 Aramco CBT Electrical Qc Questions and Answers Free New Updated
71) Electrical Metallic Tubing (EMT) is acceptable only in non‐hazardous indoor locations. (TRUE or FALSE)
Answer:
TRUE
72) Minimum individual rung load capacity for aluminum and galvanized carbon steel cable tray
Answer:
90kg
73) Process piping can be used to support cable trays. (TRUE or FALSE)
Answer:
FALSE
74) Cable tray splicing plates shall not be located over supports and shall be located between ___________
Answer:
Supports and quarter points
75) What article in the NEC that states grounding?
Answer:
Article 250
76) Minimum grounding conductor size for substation grid.
Answer:
70mm²
77) In Electrical Area of Classification, what are the locations that are classified?
Answer:
Class I, Zone 0; Class I, Zone 1; Class I, Zone 2
78) Minimum ampere rating for switchboards.
Answer:
2000A
79) Hi‐pot test voltage of 15K(12/20KV).
Answer:
64 KV
80) Minimum duration of emergency lighting in the event of normal power failure.
Answer:
1.5 hours
81) Illuminance level of Battery Room, Switchgear Room, Substation (indoor and outdoor).
Answer:
Bat. Room=300Lux; Switchgear=300; Substation (in)=50; Substation(out)=20
82) Minimum vertical clearance between cable trays
Answer:
200mm
83) Maximum temperature of battery room.
Answer:
25°C
84) For current limiting reactors, the short time rating for fault limiting reactors shall be _
Answer:
3 seconds
85) For aluminum cable trays, maximum spacing between expansion joints that allow a 25mm movement
Answer:
20m
86) Minimum creepage distance to ground in each phase for 13.8KV outdoor terminations.
Answer:
552mm
87) Minimum depth of burial for Duct Bank for 600V to 35KV under roads.
Answer:
610mm
88) Minimum spare allowance for duct banks.
Answer:
0.2
89) Minimum separation between power cable operating at 1000V or above, upt to 34.5KV and parallel or crossing power or control cable operating at less than 1000V.
Answer:
300mm
90) Min. working clearance on all sides for onshore, outdoor installation pad mounted electrical equipment.
Answer:
2 meters
91) Minimum unobstructed horizontal spacing for front, back and sides of switchgear.
Answer:
Front = 2 meters; Back and Sides = 1 meter
92) Winding type for power and distribution transformer.
Answer:
Two‐Winding
93) When transformer operated in parallel, the total circulating current shall not exceed ____ of the rated current of the lowest KVA rated transformer.
Answer:
0.1
94) What is the meaning of SAMSS?
Answer:
Saudi Aramco Material System Specification
95) What is the meaning of SAITP?
Answer:
Saudi Aramco Inspection and Test Plan
96) What is the meaning of SAES?
Answer:
Saudi Aramco Engineering Standards
97) Permitted maximum extension above ground for PVC stub‐ups without attaching to equipment
Answer:
150mm
98) PVC conduits shall not be extended above grade in industrial facilities. If above grade extensions of buried PVC conduits are necessary, a transition shall be made aboveground ( TRUE or FALSE)
Answer:
FALSE?
99) Bell end fittings or protective bushings shall not be provided on each duct where it terminates.(TRUE or FALSE)
Answer:
FALSE?
100) For duct banks, the spacers shall provide a minimum conduit separation of ____ for 2 inch conduits and larger
Answer:
50mm
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