الجزء 4 أسئلة وأجوبة أرامكو سي بي تي الكهربائية لمراقبة الجودة وتحديثها مجانًا
101) For duct banks, the spacers shall provide a minimum conduit separation of ____ for 1.5 inch conduits and smaller
Answer:
25mm
102) A type of conduit entering (from below grade) switchgear, control cabinets, and similar enclosures sitting on the ground shall be cut and threaded 50mm above finished grade level and threaded
Answer:
Metallic
103) A type of conduit entering switchgear, control cabinets, and similar enclosures sitting on the ground shall be cut flush with finished grade level and shall have its inner edge filed to smooth radius.
Answer:
PVC
104) For underground cable systems, a precast 50mm thick red concrete tiles, red plastic tiles, or PVC coated steel fence fabric shall be placed _____above direct buried cable or direct buried conduit.
Answer:
300mm
105) Minimum depth of burial for direct buried cables rated over 65KV
Answer:
1070mm
106) Minimum depth of burial for direct buried PVC rated 600V and below
Answer:
460mm
107) Minimum depth of burial for direct buried PVC rated over 600V to 35KV
Answer:
610mm
108) Minimum depth of burial for direct buried PVC rated over 35KV
Answer:
760mm
109) Direct buried cables, conduits, or duct banks can be installed directly above or below parallel underground piping. (TRUE or FALSE)
Answer:
FALSE
110) After installation and during commissioning, what is the test voltage for insulation resistance testing (megger test) of low voltage cables rated 600V, 450/750V, or 600/1000V
Answer:
1000V DC
111) After installation and during commissioning, what is the test voltage for insulation resistance testing (megger test) of new cables rated 5KV through 35KV
Answer:
5KV DC
112) High‐Potential test voltage for new cables rated 5KV or 6/10KV
Answer:
36KV DC
113) High‐Potential test voltage for new cables rated 15KV or 12/20KV
Answer:
64KV DC
114) High‐Potential test voltage for new cables rated 35KV
Answer:
100KV DC
115) High‐Potential test voltage for new cables rated 69KV
Answer:
192KV DC
116) High‐Potential test voltage for new cables rated 115KV
Answer:
240KV DC
117) Minimum separation (above or below ground) between any power cable operating at above 34.5KV, and cables operating at or below 34.5KV
Answer:
1m
118) There are no minimum separation requirements between Power and/or Control conductors for DC or AC circuit voltages less than 1000V provided the insulation is rated at least 600V or 450/750V. (TRUE or FALSE)
Answer:
TRUE
119) What are the two kinds of Cathodic Protection System?
Answer:
1) Galvanic (Sacrificial) 2.) Impressed Current
120) Bare copper grounding conductors shall be buried in minimum depth of _______
Answer:
460mm
121) System grounding type required for 4.16KV to 13.8KKV
Answer:
Low Resistance Type
122) The grounding resistance of made electrodes (grounding rods/or ground grid) used for system grounding shall not exceed _____ for solidly grounded systems above 600V
Answer:
1 ohm
123) Shields and armor of power cable shall be grounded at one end. (TRUE or FALSE)
Answer:
FALSE
124) Motors, transformers, and generators operating at nominal voltage of 480V shall have a minimum of ______ connection to supplementary grounding electrode
Answer:
1 (one)
125) Minimum grounding conductor size used for equipment connection to ground rods or ground grid
Answer:
25mm² (#4 AWG)
126) For tank grounding, the tank shell to remote earth resistance shall not exceed
Answer:
10 ohms
127) Conduct the inspection with pulse type holiday detector set a _______ .
Answer:
18,000 Volt DC
128) Perform time‐current characteristic test by passing ____ rated current through each pole separately.
Answer:
3
129) For pipe line the negative pipe to soil ON shall be of _____ and a maximum of _____ with reference to copper/copper sulfate electrode.
Answer:
1.2 V / 3 V
130) An electrical system/method use to minimized corrosion __________.
Answer:
Cathodic Protection
131) Impressed current systems are not allowed for __________.
Answer:
Camel crossing
132) What is the minimum depth of direct buried grounding conductor?
Answer:
460 mm
133) What is mean by NGR?
Answer:
Neutral Ground Resistor
134) What is the meaning of FPN stated at Article 250‐20?
Answer:
AC System needs to be grounded
135) For aluminum cable tray the expansion joints is usually required in every ____ of the straight run of the cable tray assuming a maximum temperature of 55° Celsius.
Answer:
20 M
136) What is the standard wire fill requirement for conduit sealing fitting?
Answer:
25% max
137) In class 1 division location, conduit seal fitting shall be install within _____
Answer:
18 inches
138) Intrinsic safety protection technique shall be permitted for equipment in ______
Answer:
Hazardous location
139) In Saudi Aramco installation, the minimum size of conduit shall be?
Answer:
¾ inch
140) What is the maximum percentage of cross section in a conduit raceway can be filled containing three or more conductors?
Answer:
0.4
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