questions module 1

7/17/2019 Questions Module 1

http://slidepdf.com/reader/full/questions-module-1 1/5

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:



'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



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



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



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#

questions module 1

Documents