2020 2021 Student Forum Power Grid Exam Question Paper

#1
9th December 2014, 09:47 AM
 Unregistered Guest
Power Grid Exam Question Paper

Will you please provide the question paper of Power Grid Exam ?
#2
9th December 2014, 02:06 PM
 Super Moderator Join Date: Apr 2013
Re: Power Grid Exam Question Paper

Here is the list of few questions of Power Grid Exam Question Paper which you are looking for .
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
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
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
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
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
#3
11th December 2014, 01:43 PM
 Unregistered Guest
Power Grid Exam question paper

Hi I want the question paper of Power Grid Exam for Diploma Electrical so can you provide me?
#4
11th December 2014, 02:52 PM
 Super Moderator Join Date: Apr 2013
Re: Power Grid Exam question paper

Hi, as you want the question paper of Power Grid Exam for Diploma Electrical so here I am providing you

Power Grid Exam question paper

1. What is causal system?
2. Shunt reactor is used in EHV transmission line for
3. 20w, 40W, & 200w lamps are connected to three phases if neutral wire breaks then
which lamp will fuse first? 1) 20 2)40 3)200 three lamps will fuse together.
4. Synchronous machine can be operated at both lagging and leading power factor
5 What does synchronous speed mean?
6. Frequency of emf generated per rotation of rotor is equal to.
7. DC machine having wave winding is wounded as lap winding what will be the effect
on emf generated
8 Which is remain unchanged in transformer action?
9. In transformer windings are connected.?
10. In general how transformer is rated?
11. What is given on the name plate of motor? 1) KW 2) KVA 3) output shaft power
12. Short circuit test of transformer gives what?
13. Transformer core are laminated for what purpose?
14. What is supply voltage for heavy industry .1) 33KV 2) 11KV 3) 132 KV 4) 66KV
15. Basic structure SCR as a two transistor i.e. how they are connected?
16. What is Triac?
17. System admittance is (G+jB) what is reactive power absorbed if the voltage is V KV?
(1) V (square)*B (2) V (square)*g .
18. In series R-L circuit what is phase difference between the voltage drop across R and
L?
19. Power factor is cosine (delta ) delta is the angle between 1) phase voltage phase
current 2)
Line voltage lone current 3) phase voltage line current 4) line voltage phase current.
20. Laplace of exp (-at)?
21. For series R-L-C circuit the load will be capacitive if the frequency is 1) greater than
the resonant frequency 2) less than the resonant frequency 3).
22. In Wiens bridge which circuit elements determine the frequency range?
23. What is the output if two booster having duty cycle K and (K-1) are connected in
series?
24. If a DC shunt motor is loaded from unloaded condition what will be effect of on
terminal voltage?
25. A second wire system having one pole one right half of the s-plane. When the system
will be stable?
26. A system having repetitive pole what will be effect on the gain at the cross over
frequency?
27. Hollow conductor is used to reduce corona loss how does it reduce the loss?
28. In DC machine how voltage is related to flux?
29. Nature of current and voltage in the armature and at the terminal in DC machine.
30. Motor acts on the principle of ..rule
31. Which instrument measure both ac and dc?
32. How the rotation of induction motor is reversed?
33. If 3-phaseof a 3- phase balance load are reversed what will be the effect on the line
current?
34. If the rating of VAR absorber is 50MVAR at 400KV. What will the VAR absorbed
by the absorber at 300KV?
35. In regenerative breaking of DC series motor what is done?
36. Definitions of Fourier transform?
37. Laplace of f(t) is F(S) what is Laplace of f(t+T) .
38. Z-transform of sampled function x(n) for n>0.
39. Laplace transform of impulse function.
40. Z-transform of unity.
41. How many slip rings are there in 3phase synchronous motor?
42. How the speed of synchronous motor is controlled?
43. Speed control of induction motor?
44. When power supply is supplied to heater coil it glows while simple wire does not
glow. Why?
45. A synchronous generator having inertia constant 4 and having rating of 100MVA.
What will be energy stored by the machine?
46. A transformer having ratio 20:1. The secondary load is 0.6 ohm and the voltage
across it is 6 V what will be the primary current?
47. A RC circuit having r=0.8ohm, c=2.5micofarad what will be the time constant?
49. Two capacitors connected in series the equivalent capacitance is 0.03uf and when
connected in parallel the equivalent capacitance is 0.16uf find out the ratio of the two
capacitance?
50. An L-c circuit having frequency 1/sqrt (LC) what will the equivalent impedance?
51. An inverting op-am having input with resistance in series and a capacitance in
feedback operates as a.?
52. A current having fundamental and third harmonics what will be the rms value of the
current?
53. Peak to peak value of voltage if rms voltage is 100V.
54. Rms voltage.
55. What is the approx efficiency of nuclear power plant?
56. What is the average current of a single phase full wave rectifier firing at angle alpha?
57. What is the function of freewheeling diode?
58. When SCR stops conduction? (holding current)
59. For measuring current why shunt resistance is used?
60. For economic operation of plant what is the condition?(taking into account the
penalty factor)
61. Incremental fuel cost of two plants is given and a load is given. Find out the load
sharing for economic operation of the plant?
62. A two port network is represented by ABCD parameters. What will be condition for
the two port network to be symmetrical?
63. Size of the conductor is determined by .
64. Which Surface is suitable for grounding?
#5
18th March 2015, 09:31 AM
 Unregistered Guest
Re: Power Grid Exam question paper

I am searching for the Power grid Placement Paper Question Paper? Can you please tell me from where I can get the Power grid Placement Paper Question Paper?
#6
18th March 2015, 09:32 AM
 Super Moderator Join Date: Apr 2013
Re: Power Grid Exam question paper

You are asking for the Power grid Placement Paper Question Paper. Here I am providing you the Power grid Placement Paper Question Technical questions Paper. This is as follows:

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

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

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 stabilityans. for closed loop system by integral controller steady statestability 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

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
#7
21st March 2015, 09:18 AM
 Unregistered Guest
Re: Power Grid Exam Question Paper

Hey, I am preparing for the Power grid Placement test will you give me sample paper of the Power grid Placement test as I am looking for the same ?
#8
21st March 2015, 09:20 AM
 Super Moderator Join Date: Apr 2013
Re: Power Grid Exam Question Paper

As you want I am here providing you sample paper of the Power grid Placement test.

Sample paper :
Power Grid Placement Paper
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

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

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 stabilityans. for closed loop system by integral controller steady statestability 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

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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