#1
6th August 2014, 12:45 PM
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Power Grid Corporation Junior Technician Trainee Exam paper
I want to know about question paper for Power Grid Corporation Junior Technician Trainee examination ?
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#2
6th August 2014, 04:39 PM
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Re: Power Grid Corporation Junior Technician Trainee Exam paper
Here I am giving you question paper for Power Grid Corporation Junior Technician Trainee examination below : 1. resistance of ideal transformer winding ans. zero 2. hysteresis loss in transformer depends on frequency as ans. square of frequency 3. in no load test of transformer input power is equal to ans. iron loss or constant losses 4. zero voltage regulation occurs in which power factor condition ans. leading power factor condition 5. load sharing in parallel operation of transformer ans. impedance is inversely proportional to KVA rating of transformer 6. relation between starting torque of slip ring induction motor and squirrel cage induction motor ans. starting torque of slip ring induction motor is more than starting torque of squirrel cage induction motor 7. relation between rotor power input, slip and rotor copper loss in induction motor ans. rotor copper loss is equal to slip time the rotor input power 8. relation between starting torque when induction motor start with the help of star delta starter and auto transformer ans. in star delta transformer starting starting torque is 1/3 times the full load torque with some other factor 9. due to feedback which factor increases ans. stability of the system 10. in second order system damping factor 11. numerical on peak overshoot 12.numerical on steady state error 13. numerical on transfer function of system 14. numerical on stability of system 15. problem on root locus 16. effect of integral controller on system stability ans. for closed loop system by integral controller steady state stability increases 17. to gate high starting torque starting method of induction motor ans. external resistance starting method 18. to gate low starting power factor in starting of induction motor ans. external reactance starting method 19. relation between power transferred by 1phase line and 2 circuit line 20.bundled conductors are used to ans. reduce corona loss 21. relation between corona loss with frequency and diameter of conductor ans. corona loss directly proportional to frequency and inversely proportional to diameter of conductor 22. series capacitor used in power system to ans. series capacitor for stability of power system 23. insulation level is decided by ans. switching over voltage 24. effect of using bundled conductor on inductance of conductor ans. decreases 25. insulator type used when there is dead end or change in direction of conductor ans. strain type 26. resistance switching used in which circuit breaker ans. air blast circuit breaker 27. relation between resistance , inductance and capacitance in resistance switching 28. where are the lightning arrestars are located ans. near the transformer 29. which type of relay are used in overloading ans. thermal relay 30. whenever difference in current which relay is used ans. differential relay 31. which distance relay is directional ans. mho relay 32. damper winding are used in alternator for ans. prevent hunting and provide high starting torque 33.effect of armature reaction ans. both cross magnetising and demagnetising 34.question from inverted v curve of synchronous motor curve 35.numerical from source transformation technique 36. numerical related to find rms value of triangular wave 37. in series RLC circuit if frequency greater than resonent frequency than impedence offered by circuit ans. inductive 38.numerical from dc switching of inductor , capacitor and resistance in a network 39. eddy current damping used in which type of instrument ans. pmmc 40. fluid friction damping used in which type instrument ans. horizontal MI 41. numerical from two wattmeter method 42. numerical from over ranging of digital instrument 43.two or three question from CRO 44.relation between latching current and holding current ans. latching current> holding current 45. di/dt protection of thyrestor ans . using inductor in series 46. difference between BJT and MOSFET ans. in BJT sec. breakdown 47. terminal of IGBT 48. terminals of MOSFET 49. for proper commutation relation between circuit turn off time and thyristor turn off time ans. circuit turn off time must be greater than thyristor turn off time 50. specific of earthing transformer ans. no secondary |
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