**Power Grid Technical Question Paper Answer 2020 Placement Paper of PGCIL.**

PGCIL Power Grid Technical Question Paper 2020 Placement paper of Power Grid Technical

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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