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# Abb Placement Papers

23. Improvement in power factor reduces
(a) power consumed by consumer, (b) power generation, (c) both a &
b...........Ans: (c)
[Confirm it]

25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field
current.......................................(Ans: a)

26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating power has a frequency (a) 50 Hz, (b) 100, (c) no oscillating power is there in resistive ckt......Ans: (a)
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases............Ans: (b)

28.After rain what happens to Insulator (a) break-down strength of Insulator decreases, (b)Arch length reduces, ..........Ans: (b).....[Confirm it]

29.Diversity factor helps to ............(what ?) [Read diversity factor, load factor, Reserve capacity factor in depth, with
calculation]

30. Why capacitance is shown as a Shunt element in analysis of transmission line
(a) it is between Conductor & earth, (b) because Admittance is used for calculation of capacitive reactance........................Ans: (a)

31. B-R-Y sequence is followed in three phase system, if phase voltage in B-phase is Vm sin 100, then the phase voltage in R-phase would be (a) Vm sin (-20)
Ans:(a)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is (a) pure resistive ckt
[Ans]
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is the time constant...........Ans: time constant = L/R = 0.5

34. In electro-dynamometer A'meter & wattmeter the type of scale is
Ans:Non-uniform
35. For the same current carrying capacity corona loss of ACSR will be ________than copper conductor.
(a) more, (b) less, (c) equal.
Ans:(b)
36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor, then what happens to the illumination, if we change the capacitance.
Ans: No change at all

[N.B] We are not mentioning the options in sequence, and do not think that ans for the most questions is option (a). Read all options very carefully as all are very close to each other.

QUANTITATIVE PAPER + PCM paper

45 Questions ---------45 minutes
1. About 10 quanti questions ( based on Mixture, Work etc. of very easy type)
2. What is GDP ?
3. Vector algebra, codition for Co-planer vector etc.
4. Gravitation, geo-synchronous satellite( it's hight, orbit , radius
etc.), escape velocity, how g (gravitational accln) varies, about gravitational potential.
5. Basic electricity and Magnetism----Biot-savart law, current carrying conductor properties.
6. Nuclear physics, Bohr's constant, and Other theories related .
7. Problem based on VIBGYOR , how wave length and frequency is varying.
8. Questions based on Plank's Theory, E =hv
9. V=u + at , V2=u2 + 2as and W = mgh questions based on above theory
10. Faraday's laws of electrolysis, m = Zit
11. Heat conduction problem.
12. Co lour-coding of resistor (BBROYGBVGW)
13. How velocity of light changes in different medium while frequency remain unchanged.
14. statistics , calculation of mode, co-efficient regression (3-4 Questions)
15. f(x) = Sin x + Cos x, find the maximum value of the function.......Ans: sqrt (2)
16. Formulae for parallel plate capacitor and force between plates.

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