Electrical Engineering Interview Questions

If the characteristic Impedance is equal to load Impedance then…… a) voltage will be increased b) power transmission is zero c) …… d) max. power is transmission to load

3289

The normal highest generated voltage in India is a) 6.6KV b) 132KV c) 11KV

13507

The corona effect is more in a) summer b) winter c) dry weather d) humidity weather

CPCL,

8152

ynchronous M/C with under excitation with reactive power absorption , acts as a) synch. Motor b) synch gen c) synchr capacit

2065

Why size of HT cable is less then LT cable inspite of the fact that voltage is higher in HT cable?

L&T,

5388

How will I know that how many batteries I should connect to my UPS unit?

6209

A 25MVA 3300/400V T/F is termed as per winding is …… a) primary 3300V & Secondary 400V b) primary 3300V & low voltage winding 400V c) High voltage winding 3300V & Secondary 400V d) High voltage winding 3300V & low voltage winding 400V

2824

Buchholz relay is used ………. a) protection T/F b) oil T/F c) Air core T/F

9572

Resistor switching is used in which type Circuit Breaker ? a) oil filled CB b) Air blast CB c) Gas filled CB

19126

In EHV tranm. The conductors are …….. a) Cu roads b) Cu bars with Si c) Cu tube with Si plate

3013

the max. power will be transferred if …… a) sending end vol. is high b) receiving end v is high c)…….. d) corona loss is least

2804

Moving Iron instruments are applicable with a) DC only b) AC only c) DC & AC

8974

. The string effcy in AC sys is 80% Then for same power, the string effcy in dc sys is a) less than 80% b) 80% c) more than 80% d) zero

1006

The temperature rise in the sys, which leads to ….. a) Increases stress& length b) increases stress but decreases length c) Decreases stress & increase length d) decrease stress & length

1770

According to underground cables a) stress b/w sheath & conductor is high b) inrush of core & conductor

816

Un-Answered Questions { Electrical Engineering }

How to calculate that clean water supply in one Day from 150 KLD STP?

810

Bimetal strip used in overload relay what is that,which types of material used for that & percentage.

958

how can i get the formula to find out the cable size if i know the load of main fuse protection.

695

what is accuracy ? in any meters , coils accuracy . how can u defined that ?

1085

What Maximam Gap Taibaar & Bush

1022

IN dc capacitive reactance is??

171

Explain with example of functional requirements of protection relay in terms reliability, selectivity, sensitivity

548

What is rms value wher it is used??????????

848

hi every body i am master student in control engineering and my project is slip control in trains i assumed a Dc motore as traction motor but i don't have characteristics of this kind of motor that is used in train. i want from every body if he or she has the characteristics or information about Dc motor that is used in train give me those information or technical characteristics .

356

Can Anyone suggest the Standards (IEC or IS) for selecting copper current density?

165

How will calculate losses in an multi core Aluminium LT cable of different sizes & upto what length we can use a LT Cable ?

913

sir, what is the importance of Fault MVA. how to calculate fault mva of 33kv substation connected by 6.5 km line(single circuit with equal spacing) with 110/11kv transformer in 110kv susbstation.the fault mva on 11 kv bus in 110kv susbstation is 208mva.

1741

At the starting of dc motor and syn.motor and induction motor high current flowing through the winding. Due to this the windings burnt out. To avoid this different types of starters are used. But incase of transformer what Will be used (At starting no emf is induced in the primary winding)?

773

How to measure size of cable on a given load

608

Why can't we parallel the secondary circuits of two voltage transformers?

195