questions module 1
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7/17/2019 Questions Module 1
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Q: What is the full form of EPC
A: Engineering, Procurement and construction
Q: What is the principle of Generator
A: The Generator works on Farada!s laws of Electromagnetic "nduction# As per the$rst law whene%er there is a relati%e motion &etween conductor and magnetic $eld,
an E'F is induced# The second law states that the magnitude of E'F is directl
proportional to the rate of change of (u)#
Q: What are the %arious tpes of Power generating plants
A: Thermal Power station, *del Power station, +olar Power station and wind power
station# Thermal Power station are further classi$ed as Coal &ased, uclear &ased
and gas &ased#
Q: What are %arious %oltage le%els in "ndia
A: "n single phase : -./0 AC "n three phase: .120, 3#3k0, 4#4k0, 11k0, --k0, 33k0,
44k0, 13-k0, --/k0, .//k0, 542k0 and 1///k0
Q: What are the %arious standards6guides used in Electrical design
A: "EC7 "nternational Electro7technical commission, "EEE7 "nstitute of Electrical and
Electronics Enginieers, "+7 "ndian +tandard, C8"P7 Central 8oard of "rrigation and
Power, CEA guidelines7 Central Electricit Authorit, FPA: ational Fire Protection
Association etc#
Q: *ow to specif the following e9uipment 1 Generator - Transformer 3 8reaker.8us&ar 28atter 4 'otor 5CTs ; PTs
A: Generator: k0A, kW with pf, 0oltage
Transformer: k0A, 0oltage ratio, Tpe of cooling, < "mpedance, Taps
8reaker: Continuous current, 0oltage and +hort circuit %alue
8atter : Ampere *our, 'otor: 0oltage, kW or *P
CTs:
'etering CT7 CT ratio, 0A, Class of accurac
Protection CT: CT ratio, 0A, Amplitude =imited factor
Class > or P+ Protection CT: CT ratio, ?nee Point %oltage, 'agnetising current at half
the knee point %oltage, CT @esistance#
PTs:
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'etering PT7 PT ratio 0A, Class of accurac
Protection PT7 7 PT ratio, Protection class accurac
Q: What is standard secondar rating of CTs and PTs
A: The CTs secondar can &e either 1A or 2A, The PT secondar is 11/0
Q: What are the factors to &e considered for design of Electrical sstem
A: The following shall &e taken into consideration
1 +afet
- 'inimum "nitial in%estment
3 'a)imum ser%ice continuit
. 'a)imum Fle)i&ilit and E)panda&ilit
2 'a)imum Electrical Ecienc B'inimum perating Costs
4 'inimum 'aintenance Cost
5 'a)imum Power Qualit
Q: What are the phases of Designing
A: 8asic or conceptual designing and Detailed designing
Q: What are the deli%era&les in 8asic Design
A:
1 8asic design consideration
- =oad +ummar
3 +peci$cation of %arious e9uipment
. +stem studies to $nalie the +stem %oltage and short circuit %alues
2 +ingle line diagram
4 Area classi$cation
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Q: What are the deli%era&les in Detailed Design
A:
1 +stem studies
- =oad lists
3 0arious e9uipment B Transformer, Generator, Capacitor &ank, P+,
8atter,ca&le siing
. Earthing design
2 "llumination design
4 Detailed +=D and Protection +=Ds
5 E9uipment laouts, Earthing and lightning protection laouts, "llumination
laouts, ca&le tra laouts
; Preparation of detailed speci$cations of e9uipment
H E%aluation of &ids
1/ 0endor drawing re%iew
11 Ca&le schedules, termination schedules
1- Field 9ualit plans
13 Testing and commissioning support
Q: *ow the %oltage are classi$ed
A: The terminolog used di%ides %oltage classes into:
• =ow %oltage I1#1 k0#
• 'edium %oltage J1#1 k0 to 11 k0
• *igh %oltage#J11 k0 to 44 k0
• E)tra7high %oltage# J 44k0 to 542k0
• ltra7high %oltage#J 542k0
Q: *ow the %oltages are classi$ed for 'otors
A: pto -//kW K .120
-//kW to 12//kW7 3#3k0 or 4#4k0
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J12//kW K 11k0
Q: What are other disciplines with which the co7ordination re9uired in design
A: The disciplines are
1 Ci%il and structural
- 'echanical K @otating, Piping, *0AC, +tationar
3 Process
. Control and instrumentation
2 +afet
4 ProLect 'anagement
Q: What is green $eld and &rown $eld proLect
A: A green $eld proLect is a completel new proLect and whereas &rown $eld proLect
means is either a e)pansion or reno%ation of e)isting proLect#
Q: What are the minimum data to &e pro%ided in a load list
A: The following shall &e pro%ided in a load list
1 E9uipment tag no
- E9uipment name
3 @ating of e9uipment in kW or k0A with 0oltage
. Tpe of dut7 Continuous, "ntermittent, stand&, Future
2 Tpe of load7 0ital, Essential, on7 Essential
4 Mone of Classi$cation
Q: What is load factor
A: The ratio of the a%erage load supplied during a designated period to the peakload occurring in that period, in kilowatts#
Q: What are %arious tpe of loads
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A: 0ital loads: These are mainl for the safet of the personnel7 Emergenc
lighting, Fire detection sstems, P+, a%igation aids, Pu&lic address sstem
Essential loads: These are mainl for safet of the process e9uipment7 "mportant
pumps of the process, DC 8atter charger, P+, Emergenc lighting etc
on7Essential loads: The loads which can &e shut down are called non essential
loads
Q: What are the %alues of Di%ersit factors to &e considered for Continous,
"ntermittent and stand & loads
A: For continuous loads K /#H to 1#/, For intermittent loads7 /#2 to /#4 and for
+tand& loads7 /#1 to /#
The di%ersit factors at the &asic engineering stage or FEED stage is little higher#
Q: *ow man incoming source feeders to &e considered for a process plant
A: The no# of feeders shall &e such that the process shall not ha%e an eNect in case
of B71 contingenc where is total no# of incoming feeders#
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