Electrical

Published on March 2017 | Categories: Documents | Downloads: 35 | Comments: 0 | Views: 449
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* Can a TJM 10 relay measure over current? * Can I improve the furnace power factor (10 mva transformer) by adding a ca pacitor bank before the transformer? Does system power factor vary a lot with th e furnace PF? * Can Superposition theorem be applied to AC Circuits? Can Thevenin's Theore m be applied to AC Circuit too? * Can we connect p.f. of 320 kva alternator at local site with rated .8 pf l agging? * Can we correct the p.f. of ac generator? * Can we correct the p.f. of ac generator? * Difference between low impedance and high impedance Restricted Earth Fault * Differentiate between Low and High impedance Protection * Differentiate between Zero and Negative sequence current * Explain the function of closing coil of A.C.B.? * Give a brief idea about Control circuit wiring in Substation? * How many types of temperature measurement is possible? * how the capacitance is calculated if the load is varying to keep the power factor constant(above0.95) * How to calculate find rated current for cable sizes.(both copper & alumini um) with examole? * How to calculate per unit impedance of transformer? * How to calculate the ups load in KVA? * How to determine kilowatts (real power) is used in energy meter? Is it app arent power effect the disk rotation? * How to set an overload set the range from 2.8A to 4A , rated motor current 22A, CT 60/5A * If neutral earthing is weak of a system then how can we improve it? * If the area of cross section of the wire , wattage of the load ,voltage su ppl to the load and also power factor of load is known then for what amount of c urrent should different type of cable be used? * In a poly phase circuit if clamp on meter shows same load on three phases and their sum on neutral then why we use three and a half core cable or maximum the same size of core as that of phase? * In a poly phase circuit if clamp on meter shows same load on three phases and their sum on neutral then why we use three and a half core cable or maximum the same size of core as that of phase? * What are service settings for MCCB? How can be it set? * What are the procedures followed for underground cable laying? * What are the symbols at the down (below) the analog ammeter? * What can be the causes of capacitor start motor having a higher current th at its actual? * What causes threshold voltage to exist? * What happens when back feeding supply accidently collapses with normal sup ply? How [that is sometimes in a substation 11kv feeder if there was long time p ermit work, back feeding supply will be provided from nearest substation and if accidently after the permit work, they charged the feeder without removing back feeding what will happen? * What is Bucholtz Relay test???? Explain?? * What is Harmonics how it is produced and what is the method to control the same * What is master trip relay? How does it work? * What is mean by drives? * What is oti and wti? * What is real and reactive power? * What is the difference between inverter and ups? * What is the difference between PLC & DCS? * What is the effect of impedance on the heat losses in case of AC system? D o heat losses really depends on the impedance or depends only on resistive compo nent only? * What is the effect of impedance on the heat losses in case of AC system? D

o heat losses really depends on the impedance or depends only on resistive compo nent only? * What is the instrument to check the rotating diode fuse of alternator in r unning conditions? * What is the meaning and difference between ELECTRICAL DRAWOUT and MANUAL D RAWOUT? * What is the name of oil used in transformer * What is the relation between the size of the machine and the frequency? (W hen the frequency increases the size of machine will increase, why?) * What is trip circuit supervision relay? How does it work in switchgear? * What should be distance between phase to phase in 415v system? * What should be distance between phase to phase in 415v system? * What will happen if the field and armature both are made to rotate in a sy nchronous machine? * What will happen if u run induction motor beyond its rated speed * What s the difference in using the 125% and the 250% factor of safety in cal culating circuit breakers capacity in motor application? * What are the functions & ratings of panels mentioned below: 1. Main LT Panel(MLTP) 2. Motor Control Centre(MCC) 3.Feeder pillars 4.Bus ducts * When will you multiply and divide with derating factors to the actual valu e while sizing the cable? * Which is the most advanced form of SF6 BREAKER? Can we use other gases to quench the arc? * Why are transformers rated in KVA and not in KW? * Why dc voltage used to excite alternator field instead of ac? * Why glands not provided for XLPE cables? * Why in dc generator field rheostat kept in maximum position? * Why induction motor cannot be operated at synchronous speed? What would ha ppen if it is operated at synchronous speed?? * Why magnetising curve not start with zero voltage? * Why screen of the screened cable not earthed on both the ends of cable? * Why the connection is better in terms of efficiency and p.f for a laod les s than 40% and why after delta is better for greater 40%? * Why the output of generator varies even though the shaft speed is constant in thermal power plant? * Why the rating of dc machine is in HP? * Why transformer rating is in KVA? * Why voltage rating of transformers is in multiples of 1.1? * Why we are used armed coble for wiring of 3phase motor? * Why we choose 50 or 60 hertz not other value for the power system? * Why we ground the secondary of current transformer. * Why we have and use 3 phase not 2 or 4 or other in power system?

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