Power grid exam model question papers

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[Arun Vats]

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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

NUMERICAL APTITUDE QUESTIONS
1 (95.6x 910.3) ÷ 92.56256 = 9?
(A) 13.14
(B) 12.96
(C) 12.43
(D) 13.34
(E) None of these
2. (4 86%of 6500) ÷ 36 =?
(A) 867.8
(B) 792.31
(C) 877.5
(D) 799.83
(E) None of these
3. (12.11)2 + (?)2 = 732.2921
(A)20.2
(B) 24.2
(C)23.1
(D) 19.2
(E) None of these
4.576÷ ? x114=8208
(A)8
(B)7
(C)6
(D)9
(E) None of these
5. (1024—263—233)÷(986—764— 156) =?
(A)9
(B)6
(C)7
(D)8
(E) None of these
6. ?125÷5x ?=6265
(A)1253
(B) 1250
(C)1245
(D) 1550
(E) None of these
7.(42)2÷6.3 x 26 =?
(A)7182
(B) 7269
(C)7260
(D) 7240
(E) None of these
8.384×12×2=?

(A)9024
(B) 9216
(C)6676
(D) 6814
(E) None of these
9.6534÷40÷33=?
(A)3.06
(B) 5.25
(C)4.82
(D) 6.12
(E) None of these
10. ?2704 x ?2209=?
(A)1996
(B)2444
(C)2452
(D)1983
(E)None of these
11.2536+4851—?=3450+313
(A)3961
(B)4532
(C)3624
(D)4058
(E) None of these
12. (2560 x 1.4) +(7400 x 0.6) =?
(A)7512
(B) 9746
(C)6523
(D) 8024
(E) None of these
13. 36%of 850+? %of 592 = 750
(A)73
(B)89
(C)82
(D)75
(E) None of these
14.64%of 2650+40% 0f 320=?
(A)1824
(B) 1902
(C)1829
(D) 1964
(E) None of these
15. 486+32×25—59=?
(A) 514
(B) 528
(C) 599
(D) 507
(E) None of these

16. 1827÷ 36 x ?=162.4
(A)4.4
(B)3.2
(C)2.1
(D) 3.7
(E) None of these
17. 1008÷36=?
(A)28
(B) 32.5
(C)36
(D) 22.2
(E) None of these
18. 56.21 +2.36+5.41 —21.4+1.5=?
(A)40.04
(B) 46.18
(C)44.08
(D) 43.12
(E) None of these
19. 65%of 320+?=686
(A) 480
(B) 452
(C)461
(D) 475
(E) None of these
20. 83250÷?=74×25
(A)50
(B) 45
(C)40
(D) 55
(E) None of these
21. ?7744=?
(A)88
(B)62
(C)58
(D)78
(E)None of these
22.35%of ?=242
(A)729
(B)652
(C)693
(D)759
(E) None of these
23. 1256+4813+765=?
(A)5642
(B) 5876
(C)6788

(D) 6878
(E) None of these
24. 22 x4+(?)2=(13)2
(A) 81
(C) 27
(B) 9
(D) 64
(E) None of these
25. 432+2170+35=?
(A)494
(B) 475
(C)481
(D) 469
(E) None of these
26. Three numbers are in the ratio of 3: 4 :5 respectively. If the sum of
the first and third numbers is more than the second number by 52, then
which will be the largest number?
(A) 65
(B) 52
(C) 79
(D) 63
(E) None of these
27. The compound interest on a certain amount for 2 years at the rate of
8 p.c.p.a. is Rs.312. What will be the simple interest on the same amount
and at the same rate and same time?
(A)Rs. 349.92
(B) Rs. 300
(C)Rs. 358.92
(D) Rs. 400
(E) None of these
28. The length of a rectangle exceeds its breadth by 7 ems. If the length
is decreased by 4 cm. and the breadth is increased by 3 cms., then the
area of the new rectangle will be the same as the area of the original
rectangle. What will be the perimeter of the original rectangle?
(A)45 cms.
(B)40 cems.
(C)50 cms.
(D)55 cms.
(E)None of these
29. The sum of the digits of a two digit number is 12. If the new number
formed by reversing the digits is greater than the original number by 54,
then what will be the original number?
(A)28
(B) 48
(C)39
(D) 93
(E) None of these

30. In a fraction, twice the numerator is two more than the denominator.
If 3 is added to the numerator and the denominator each, then the
resultant fraction will be 2/3 .What was the original fraction ?
(A)5/18
(B)6/13
(C)13/6
(D)7/12
(E) None of these
31. Four-fifth of a number is 10 more than two-third of the same number.
What is the number?
(A) 70
(B) 75
(C) 69
(D) 85
(E) None of these
32. A shopkeeper purchased 200 bulbs for Rs. 10 each. However, 5 bulbs
were fused and had to be thrown away. The remaining were sold at Rs. 12
each. What will be the percentage
profit?
(A) 25
(B) 15
(C) 13
(D) 17
(E) None of these
33. What should come in the place of question mark (?) in the number
series given below?
25, 34, 52,79, 115,?
(A)160
(B) 140
(C)153
(D) 190
(E)None of these
34. What number should replace both the question marks (?) in the
following question ?
?/144= 49 /?
(A)95
(B) 76
(C)82
(D) 84
(E)None of these
35. The sum of three consecutive even numbers is 252. What is the sum of
the smallest and the largest numbers?
(A)158
(B) 148
(C)168
(D) 198
(E) None of these

36. Ajay spends 25% of his salary on house rent, 5% on food, 15% on
travel, 10% on clothes and the remaining amount of Rs. 27,000 is saved.
What is Ajay’s income?
(A) Rs. 60,000
(B) Rs. 80,500
(C) Rs. 60,700
(D) Rs. 70,500
(E) None of these
37. In how many different ways, can the letters of the word ‘CRISIS’ be
arranged ?
(A) 150
(B) 240
(C) 120
(D) 200
(E) None of these
38. At each corner of a square park with side equal to 40 m, there is a
flower bed in the form of a sector of radius 14 m. What is the area of
the remaining part of the park?
(A)984 Square m
(B) 789 Square m
(C) 1014 Square m
(D) 1024 Square m
(E) None of these
39. The length of a rectangular field is thrice its breadth. If the cost
of cultivating the field at Rs. 367.20 per square meter is Rs. 27,540,
then what is the perimeter of the rectangle?
(A)47m
(B) 39m
(C)52m
(D)40m
(E) None of these
40. If the fractions8/5,7/2,9/5,5/4,4/5 are arranged in descending order
of their values, which one will be fourth?
(A)4/5
(B)5/4
(C)9/5
(D)8/5
(E) 7/2
41. The present ages of Chetna and Shikha are in the ratio of 5 :7
respectively. After 7 years, their ages will be in the ratio of 11:14
respectively. What is the difference between their ages?
(A)9 years
(B) 4 years
(C)5 years
(D) 7 years
(E) None of these

42. If 13 men can complete a piece of work in 36 days, then in how many
days will 18 men complete the same work?
(A)16 days
(B) 20 days
(C)26 days
(D) 30 days
(E) None of these
43. If the area of a circle is 75.44 square cm then what is the
circumference of the circle?
(A)29.2 cm
(B) 28.9 cm
(C)30.8 cm
(D) 40.2 cm
(E) None of these
44. Girish started a business investing Rs. 45,000. After 3 months, Vijay
joined him with a capital of Rs. 60,000. After another 6 months, Ankush
joined them with a capital of Rs. 90,000. At the end of the year, they
made a profit of Rs. 16,500. What is Girish’s share of profit ?
(A) Rs. 5,500
(B) Rs. 6,000
(C) Rs. 6,600
(D) As. 5,900
(E) None of these
45. What is the average age of a family of five members, whose ages are
42, 49, 56, 63 and 35 years respectively?
(A)60 years
(B) 49 years
(C)45 years
(D) 58 years
(E) None of these
46. A and B are two taps which can fill a tank individually in 10 minutes
and 20 minutes respectively. However, there is a leakage at the bottom
which can empty a filled tank in 40 minutes. If the tank is empty
initially, how much time will both the taps take to fill the tank
(leakage is still there) ?
(A) 8 minutes
(B) 7 minutes
(C) 10 minutes
(D)15 minutes
(E) None of these
47. What is 50% of 40% of Rs. 3,450?
(A) Rs. 690
(B) As. 520
(C) Rs. 517.5
(D) Rs. 499.2
(E) None of these
48. If an amount of Rs. 5,86,700 is distributed equally amongst 25
persons, then how much would each person get?

(A) Rs. 2,54,876
(B) Rs. 2,34,68
(C) Rs. 3,74,20
(D) Rs. 1,95,62
(E) None of these
49. An urn contains 9 blue, 7 white and 4 black balls. If 2 balls are
drawn at random, then what is the probability that only one ball is
white?
(A) 71/190
(B) 121/190
(C) 91/190
(D) 93/190
(E) None of these
50. If the price of 5 transistors and 2 pen stands is Rs. 810, then what
will be the price of 7 transistors and 9 pen stands?
(A) Rs. 1,320
(B) Rs. 1,500
(C) Rs.1,150
(D) Cannot be determined
(E) None of these
ANSWERS:
1 - D 2 - C 3 - B 4 - A 5 - D 6 - A 7 - E 8 - B 9 - E 10 - B 11 - C 12
- D 13 - D 14 - A 15 - B
16 - B 17 - A 18 - C 19 - E 20 - B 21 - A 22 - C 23 - E 24 - B 25 - A 26
- A 27 - B 28 - C 29 - C 30 - D 31 - B 32 - D 33 - A 34 - D 35 - C 36 -
A 37 - E 38 - A 39 - D 40 - B 41 - E 42 - C 43 - C
44 - A 45 - B 46 - A 47 - A 48 - B 49 - E 50 - D