-
Power Main Cable Puncture and Bursting
In a Manufacturing Factory, it is observed regularly the power cables are bursting resulting in fire even though branded cables are used. Identify the cause of bursting and guide to avert any future disaster of cable failure leading to mega fire accident.
-
Transformer Performance
What is the primary impact on the transformer performance if more than the rated KVA load is put on the transformer?
-
On what basis is the power rating of the generator decided??
bittu123
- Nov 9th, 2011
The core criteria for deciding rating of machine is LOSSES. while this may ultimately justify all the reason specified by above person. Because temperature rise of machine depend on losses. Insulatio...
raviiisc
- Jun 9th, 2011
For any electrical equipment the power rating is decided by the thermal rating.orThe temperature withstanding capability of the machine.For generator the power rating depends on temperature, volume of rotor.
-
Conductor Size of Fuse and Cable
For 63A load we can use 25/35sqmm cable. For same rating fuse conductor size is too low. How is it possible?(Its not depends on meterial, because single strand for above cable size is enough for fuse)
haveasafeday
- Mar 24th, 2009
Generally Fuse is used for short circuit protection. That means it should be higher(normally 2 to 3 times of rated current depending on design) than other installation in a perticular circuit.
sindhejs
- Feb 16th, 2009
As we know that fuse use for the safety purpose. And current will flow on the bases of resistance, as fuse?wire of small length (so it has lesser resistance), it can withstand 63A (as 25/35sq. mm cab...
-
Power Generation
What measures will take for cost saving in utility and power generation
bittu123
- Nov 9th, 2011
POWER GENERATION 1. Try to increase "Diversity factor" as much as u can. 2. Try to increase "Load factor" 3. Try to decrease "Maximum demand" UTILITY : 1. Use Power factor improvement instrument lik...
Nishant Choudhary
- Jun 3rd, 2011
The first thing always be remembered that for economical purpose the power factor should always be kept around unity or close to unity this u can do by avoiding light loads or by using APFC panels to improve power factor
-
Series Connection
If 100w & 50w bulb connect in series and if we supply 440v then what happen, which one glow first?
veerateja
- Dec 17th, 2010
The two bulbs will glow at a time bcoz the ckt should close the path through the second bulb also mean while the electricity(electron) speed is nearley equal to light speed.
-
DC Generator Brush
Why the brush is fitted in M.N.A axis? What is its effect on speed?
bittu123
- Nov 9th, 2011
Since reversal of current take places at MNA not at GNA, So, commutation can be improved by putting brush at MNA. Otherwise it leads sparking and damaging brushes and commutator. If load connected ac...
Nishant Choudhary
- Jun 3rd, 2011
It does not effect the speed it is done to reduce sparking at the commutator contacts
-
When should I use fuse , mcb(b,c,d,k) tybes , mccb ?
I mean which applications should require any of the above circuit breakers.
-
Describe How energy is stored in a inductor on electronic level
George
- May 14th, 2007
Energy is stored in an inductor in the form of a magnetic field.
-
How do we select a cable for a machine as per standards. Is there is any standard to select a cable as per voltage, or as per KVA and as per amps ratings?
prafulla patil
- Nov 15th, 2010
Cable size depends upon current carrying capacity and operating Voltage of Machine to select cable size also the Distance from the Supply Panel to Machine and way of laying cable under ground or on ca...
jatin patel
- Oct 16th, 2007
Cable size depends upon current carriying capacity and voltage to withstand,to select cable size we must have knowledge of load of machine and operating voltage
-
Why Transistors are not used as switching devices?
Dr. Raman
- Jul 28th, 2006
This is not a correct question. If an interviewer asks you, you should ask in return what kind of transistor are you talking about? Is it MOSFET, BJT, THYRISTOR etc. All semiconductor transistors are used as switching devices depending upon the application.
-
What is the main Electrical IS rules?.
yuvaraj moorthy
- Mar 25th, 2010
ISO is international standard organisation and IS is Indian standarad ...ISO has IEC which is International Electrotechnical Commision will do the standarad for all equipments and each national interp...
vishwas_deshmukh
- May 6th, 2008
IS rules is international standrds rule adopted for any comissioning,erection,or any work we want to perform.They have some certain standads according to study of researcher by comparing all geographical and availabe technical parameteres in that concerning area.Which is suitable for any work.
-
How to Simulate an Induction motor?
jatin patel
- Oct 16th, 2007
Transformer with secondary shorted is simulation of sq. cage induction motor
-
What is the resistance between neutral and earth.
RAJA.P
- Dec 29th, 2011
The difference between the earth and neutral is 0.8 or below 1
bittu123
- Nov 8th, 2011
If neutral is grounded, resistance bet earth and neutral will be ideally 0 (zero). or very low depends what conductor is used to connect neutral with earth.
If neutral is not grounded, resistance will depend on atmospheric condition and air density, will be very high, tends to infinity -
What is the difference between P,PI,PID CONTROLLER?
harry4u
- Sep 8th, 2008
The difference lies in the action of the controllerspd-helps in achieving steady state conditions quickly.pi-helps in reducing steady state errorpid-helps in reducing sready state eror and also getting steady state conditions quickly
nagaseshareddy
- Sep 19th, 2007
The difference is shows the name itselfP-proportional controlPI- proportional with integral controlPID-proportional with integral and dervitave controlHope this help you
-
What is the effect of pole slipping in generator and how it will slip?
Hashim
- Jan 19th, 2017
What happens on generator connected with grid if grid frequency increases or decreases
expertnayak
- Jun 12th, 2009
Pole slipping typically occurs under severe fault conditions which cause a transient torque on the generator which exceeds the ability of the field to hold the generator rotor synchronised to the stat...
-
How much should be the insulation resistance value of a 5KW motor and 50KW motor?
AJAY KUMAR PANDEY
- Jan 12th, 2009
IR value does not depend on KW. IR value depends on supply voltage.
haveasafeday
- Feb 5th, 2008
Insualtion resistance(IR) value of a motor does not depend upon rating(i.e. KW). It is depend upon Voltage label in which it applied.There is a example:If V=415v then IR should be min. 1.415 MohmAnd if V=6.6kv IR should be min. 7.6 Mohm
-
Explain the operation of a transistor
behera.tapan
- Nov 22nd, 2009
Generally there are three mode of transistor operation .1. Common emmiter2. Common collector.3. Common base.For example in common base connection make base is common with respect to (wrt)emmiter and c...
behera.tapan
- Nov 19th, 2009
Generally there are three mode of transistor operation .1. Common emmiter2. Common collector.3. Common base.For example in common base connection make base is common with respect to (wrt)em...
-
What is the use of control panels in transmission systems?
RAVI KUMAR
- Sep 14th, 2011
control panels are used in substations ... use is for monitoring of power system... controlling of real and reactive power flow is also done from the control panel... in case of occurrence of fault...
rahulr30
- Jun 8th, 2008
Control Panels literally help in controlling power supplied. It helps in protection and cntrols the various CBs and other protection Equipments. It hac Current relays etc to sense the current.I also helps to pinpoint the location of faults in feeders.
-
Tranmission and Distribution
Why are we employing star type transformer at transmission end and delta type transformer at receiving end?
luckwithme
- Jul 11th, 2008
Delta star transformer used in distribution purpose because of earthfault on star side do no reflect on delta side of winding. Zero phase current is eleminated in delta side of transformer and another...
chinnakalupukuri
- Apr 11th, 2008
by having the y-type on receiving end, we can get 3-phase,3-wire supply or 3-phase,4-wire supply.we can also get 1-phase supply.b'coz in y-type we have neutral point.whereas in delta type transfor...
Electrical Engineering Interview Questions
Ans