APTRANSCO AE 2012 Question Paper,Solutions,Answers Key,Discussions Held on 29 Jan 2012
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Total Exam will be of Duration 2 hours Consists 100 Marks (100 Questions). APTRANSCO AE Exam conducted for both Electrical & Telecom Streams for the recruitment of Assistant Engineers. All The Best for all Candidates those who are appeared for the APTRANSCO AE Exam.
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APTRANSCO Assistant Engineers (AE) Electrical 2012 Memory Based Question Papers with answers given by visitor.
1. A voltage waveform v(t)= 12 t2 is applied across a 1H inductor for t>=0 with initial current through it being zero. The current through the inductor for t>=0 is given by———–(4t3)
2. Two incandescent light bulbs fo 40w and 60w rating are connected in series across the mains. Then——–(the 40 bulb glows brighter)
3. Given two coupled inductors L1 and L2, their mutual inductances M satisfies—–(M<=sqrt(L1L2)
4. Consider the star network. The resistance between terminals A and B with C open 6ohms, between terminals B and C with A open is 11ohms, and between terminals C and A with B open is 9ohms. Then ————(Ra=2, Rb=4, Rc=7)
5. In a series RLC circuit at resonance, the magnitude of the voltage developed across the capacitor——( can be greater than the input voltage, however, it is 900 out of phase with the input voltage)
6. A two port device is defined by the following pair of quations:
i1=2v1+v2 and i2=v1+v2 its impedance parameters (z11, z12, z21, z22) are—–(1,-1,-1,2)
7. The impulse response of an initially relaxed linear system is e-2tu(t).to produce a response of
te-2tu(t), the input must be equal to——–(e-2t u(t))
8. The no of roots on the equation 2s4+s3+3s2+5s+7=0 that lie in the right half of s plane is——-(2)
9. For a feedback control system of type 2, the steady state error for a ramp input is——-(zero)
10. The output of a linear time invariant control system is c(t) for a certain input r(t). if r(t) is modified by passing it through a block whose transfer function is e-s and then applied to the system, the modified output of the system would be———–(c(t-1)u(t-1)
11. The phase lead compensation used to—–(decreases both rise time and overshoot)
12. Consider two buses connected by an impedance of (0+j5)ohm. The bus 1 voltage is 100/300 v, and bus 2 voltage is 100/00 v. the real and reactive power supplied by bus 1, resp are……….(1000w, 268 VAr)
13. For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to———–(1/V2).
14. During a disturbance on a synchronous machine, the rotor swings from A to B before finally settling down to a steady state at point C on the power angle curve. The speed of the machine during oscillation is synchronous at point(s)——————–(A and B)
15. A 100 MVA, 11kv, 3 phase 50hz, 8 pole synchronous generator has an inertia constant H equal to 4 MJ/MVA. The stored energy in the rotor of the generator at synchronous speed will be—(400MJ).
16. In a biased differential relay the bias is defined as a ratio of———-(operating coil current and restraining coil current))
17. Resistance switching is normally employed in——(ABCB)
18. The use of high speed circuit breakers—-(improves system stability)
19. Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching—(vacuum)
20. If the reference bus is changed in two load flow runs with the same system data and power obtained for reference bus taken as specified P and Q in the latter run———-( the system losses will be unchanged but complex bus voltages will change.)
21. The gauss seidel load flow method has following disadvantages. Tick the incorrect statement——( unreliable convergence)
22. The torque speed characteristics of a repulsion motor resembles which of the following dc motor characteristic————(series)
23. Which type of motor is most suitable for computer printer drive—–(stepper motor)
24. A 4 pole lap wound DC generator has a developed power of P watts and voltage of E volts. Two adjacent brushes of the machine are removed as they are worn out. If the machine operates with the remaining brushes, the developed voltage and power that can be obtained from the machine are—-(E,P/4)
25. A 4 point starter is used to start and control the speed of a ———–( dc shunt motor with field weakening control)
26. The function of oil in a transformer is—–( to provide insulation and cooling)
27. The core flux of a practical transformer with a resistive load————( is strictly constant with load changes)
28. In a transformer zero voltage regulation at full load is—-(possible at leading pf load)
29. A single phase transformer has a turns ratio of 1:2, and is connected to a purely resistive load. The magnetizing current drawn is 1 A, and the secondary current is 1A. if core losses and leakage reactance are neglected, the primary current is-(2.24A)
30. The low voltage winding of a 400/230V, single phase 50hz transformer is to be connected to a 25hz, the supply voltage should be——-(115V)
31. A 400/100V, 10 KVA two winding transformer is reconnected as an auto transformer is reconnected as an auto transformer across a suitable voltage source. The maximum rating of such an arrangement could be—–(50KVA)
32. When the supply voltage to an induction motor is reduced by 10%, the maximum torque will decrease by approximately——-(20%)
33. In case of a split phase motor, the phase shift between currents in the two windings is around——(300)
34. Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting—–( a capacitor in series with the auxiliary winding)
35. For a single phase capacitor start induction motor which of the following statements is valid—( the direction of rotation can be changed by reversing the main winding terminals)
36. An induction motor having full load torque of 60zNm when delta connected develops a starting torque of 120Nm. For the same supply voltage, if the motor is changed to star-connection, the starting torque developed will be——-(40NM)
37. During hunting of synchronous motor –(damper bar develops torque)
38. The phase sequence of a three phase alternator will reverse if ——-(the field current remains the same but the direction of rotation is reversed)
39. The effect of stray magnetic fields on the actuating torque of a portable instrument is max when the operating filed of the instrument and the stray fields are-(parallel)
40. A current of -8+6 (sinwt+300)A is passed through three meters. They are a center zero PMMC meter, true rms meter and MI instrument. The respective reading( in A) will be—-(-8,10,10)
41. R1 and R2 are the opposite arms of a wheatstone bridge as are R3 and R, the source voltage is applied across R1 and R3 under balanced conditions which one of the following is true—(R1=R2R3/R4)
42. A dc potentiometer is designed to measure up to about 2v with a slide wire of 800mm. a standard cell of emf 1.18v obtains balance at 6010mm. a test cell is seen to obtain balance at 680mm. the emf of the test cell is-(1.34v)
43. The minimum number of wattmeters required to measure3 phase 3 wire or unbalanced power is—(2)
44. A reading of 120 is obtained when a standard inductor was connected in the circuit of a Q meter and the variable capacitor is adjusted to a value of 300pF. A lossless capacitor of unknown value C, is then connected and the same reading was obtained when the variable capacitor is readjusted to a value of 200pF. The value of Cx in pF is—(100)
45. The two inputs of a CRO are fed with the two stationary periodic signals. In the X Y mode, the screen shows a figure which changes from ellipse to circle and back to ellipse with its major axis changing orientation slowly and repeatedly. The following inference can be made from this———-(there is a constant but small phase difference between the signals)
46. SCR can be turned off—( anode current should be less than holding current)
47. The no. of pn junctions in SCR—–(3)
48. TRIAC is a—(antiparallel thyristors combination)
49. GTO can be turned off-(by using a negative current pulse)
50. Which type of control is used for controlling the ac drive by using thyristors——–(integral cycle)
51. In DC choppers the output voltage can be controlled by using FM technique varying——–( T , Toff constant)
52. In phase control rectifiers the output voltage ripple can be controlled by—‘(load inductance)
53. Which is not a current controlled device—–(MOSFET)
54. Inverter function———(DC to AC with variable frequency)
55. In phase controlled rectifiresfree wheeling diode makes-(load current continuation)
56. Dielectric heating application—-(wood)
57. In induction heating the following is abnormally high——–(frequency)
58. Tractive effect w.r.t driving wheel axis——–(tangential*)
59. welding transformer sets have————-(high current, low voltage)
60. Simplify x’y’z+x’yz’+xy’z+xyz+xyz’=——-(y’z+yz’+xz)
Make this Discussion Successful, Thank you.
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128 Comments to “APTRANSCO AE 2012 Question Paper,Solutions,Answers Key,Discussions Held on 29 Jan 2012”
hi venki,lead compensator improves the transient stability so overshoot must be decreased.check that point.r u following GK publications
guys.. i got 61 marks in aptransco AE telecom.. kadapa zone.. any chance .. ?
friends let me discuss about the ap transco key ..
there are almost 10 mistakes in key …
1) 40 w bulb glows brighter
2) vaccuum cb is used in capacitor bank
3) no of comparators is 7
4) and frequency is high in induction
5) at the terminals of sync generator lg fault current is high
6) 4 point starter is used in field weakening control
7) the compensating coil of lpf is used for current coil compensation i.e., (i) is true and (ii) is faulse
but there are also correct answers which we think are wrong let me tell u the reason also but dont think otherwise
1) the answer c(t) u(t-1) is correct because if i/p is applied through a delay means output is also delays by the same delay but if c(t-1) u(t-1) is the answer means it is delayed by two time constants which is absolutely not a possible thing so the answer is only c(t) u(t-1)
2) and for cro also the signals are sinusoidal with their frequencies very close but not equal because the signal is varying from ellipse to circle and then ellipse which is a continuus thing .. however if the signals are having small phase difference of constant value how would it be possible to get the changing signal . we will get only either ellipse or cirle thats it .. but he has given clearly the signal is of changing nature
so the answer is correct which is the signals are sinusoidal with their frequencies very close but not equal .
3) phase lead compensation means we are adding a zero first right that means we are making the system nothing but underdamped system which will be having fast rise time but with dampings at steady state i.e., the answer is absoutely decrease rise time and increase the overshoot ….
4) and in biased differential relay the answer is absolutely restraining coil turns by operating coil turns because he has given turns in option a not the current so the answer is absolutely Nr/No … which can be verified from any book …
Is anyone finding difference in marks when Transco Key is compared with the answers put in the exam,
I want to find out if there is any fault in correction.
I got 75, and found the marks are more or less equal to the answers I have put
mr.v linga reddy DOB is 01/01/1989 you got 53 marks How can you say you getting 94 marks ya .Don’t post wrong comments here we are posting only right and true comments please don’t do it again sorry if i am rude….
Mr yadagiri I too opted for airblast cb only. But as the was answer was given as all breakers, i verified in the text books. resistance switcvh is employed in OCB,MOCB,AB but as RRRV in case of low and medium rating is low in case of OCB & MOCB it was not used for these ratings however for high ratings it is used. But generally what we all read is it was employed for ABCB(for any rating).Sorry if iam wrong. But i verified from text books.
hi friends i got 27 marks in first list and in second list i got 62 marks. but when i cross check my answer with the key given by ap transco, the marks i obtained are around 73- 75 .. is any body gone through the same situation. please reply….kindly do the needful…
friends i got transco 1st list=31
2nd list =66
the below question are consider my score become 76 surely
friends transco correct ans are
1)40w brighthigh (not 50w)
2)airblast CB (not all CB)
3)capacitor bank is employeed vaccum CB (not in air blast CB)
4)E,p/4 (not E,p/2)
5)LG fault (not 3-ph fault)
6)syn speed in A&B (not B&C)
7)operating ct coil/restaing ct coil (not operating coil/restaing coil)
8)c(t-1)u(t-1) (not c(t)U(t-1))
9)cro question small phase diff (not thire frequencies are not same)
10)compators 7 (not 8)
11)load inductance only (not both resitance and inducatance)
the above ans are surly correct these are gate questions any doubt see ACE VOLUME-1 AND VOLUME-2 MATERIALS they provide with solution also
Mr. ajay i agree with you.yes 3 mistakes are there in genco key.
Those are
1)self GMD used to find inductance only(not for both becoz in capcitor inside charge is zero)
2)jacobian matrix 21*21(not 19*19)
3)num of triangle is 13(not 11)
the above ans are pakka correct
i am saying based on c.l wadhava book
Mr.vasu i am not agree with you resistance swithing employeed only in air blast CB not in all.
In AB axial blast lo matrame use chestaru cross blast lo use cheyaru kavalante chusuko it is staight gate question in 1996
verify your self
i think apgenco key also have some mistakes, as per my knowledge
I agree with the braekers bit that all breakers( AB, OIL, MOCB) employs resistance switching
the phase sequence never changes if the direction of field current is changed
it changes only by reversal of direction
For induction heating undoubtedly the frequency is high and is of the order of 450-560Khz
For two incandescent bulbs bit the power consumed is 24 Watts not 50 Watts. But the bulb with high resistance(40W) for the same current it will glow brighter
For 4 point starter no foolish fellow opt for atmature control as there is no need of starter in armature control
Actually in defferent books defrent answers were given that is the problem and if they have given key means there must be justification for that, i will also get +ve marks
APTRANSCO ELECTRICAL KEY HAS SOME MISTAKES
FROM BOOKLET-D
QUESTION NO. YOUR ANSWER. ACTUAL ANSWER
28 B D
63 B C
64 A C
70 A D
73 A B
74 A C
78 B C
THIS ANSWER ARE PROVIDED IN GATE EXAMS
THIS KEY ANSWER ARE REVISED FROM GATE & C.L.WADWHA
ELECTRICAL POWER SYSTEM BOOK.
PLS CHANGE THE KEY PAPER
APTRANSCO ELECTRICAL KEY HAS SOME MISTAKES
FROM BOOKLET-D
QUESTION NO. YOUR. ACTUAL
28 B D
63 B C
64 A C
70 A D
73 A B
74 A C
78 B C
Hi Kartheek
Hope ur success in aptransco
Foe some bits our answers were correct but,
As i told u they consider the answers from some other book(may be from G K Publishers) and we lost around 8-10 marks .
Some others who followed the same book as that of question paper setters gained arond 8-10marks
what a pity it is?
waht do u say friends?
i got 36 first
then it was changed to 65
if the below 10 questions answers are as per jb gupta or iesmadeeasy publications i will get another 10 marks and my score will be 75.
aptransco set d
Q13–> No of comparators-7?
Q28–> Two incandescent bulbs bit –Bulbs together consume 50W–?
Q43—> Phase sequence of alternator to be reverse–direction is same and field current reverse—?
Q53—> 4point starter– for dc shunt motor with armature reistance control—?
Q64—> the fault which is severe at terminals of SG– three phase fault–?
Q70–> Resistance switching —for all breakers—?
Q78—>For capacitor bank switching—- Air blast CB—-?
Q79—-> Gauss sidel incorrect statement–good initital guess is required—?
Q81—> For induction heating—- current is higher—?
Q89—-> Phase lead compensation —increase overshoot and decrease rise time—?
WHICH BOOK ANSWERS THESE ARE
DOES THE QUESTION PAPER SETTERS HAVE MINIMUM RESPONSIBILITY OR NOT
WHAT IS UR COMMENT ON THIS FRIENDS
friends I got 55 marksin APGENCO
I am getting more than 75 is there any chance to get job and i belongs to bc-d and hyd rural zone
ajay 800mj is wrong
here are some new answers, just now checked:
67) 800 MJ
76) decrease the stability
95) DC shunt motor armature resistance control (4-point starter)
The above answers are according to gate forum solutions.
hi, m getting 84 m,z-1,bc-b,is there any chance to get job?can any one tell what is the appx. cut off marks for oc and bc?pls
@kartheek
According to which concept power is p/4???????
results are out frnds…
Hi i will 94 app. (trans)
raj u r category is oc u have chance
what will be the cut off for ocs this time
friends all r ace key for genco…? in aptitude i have some doubts
1)no of triangle i got 13
2)LEADER is arranged in 360
3)num and denominator i got 5/19
can any one got ans like me
Mr. mahesh i am agree with u becoz paper is easy for only who solve previous gate papers otherwise it is difficult to getting more than 65.more than 80% ques get from gate papers only
Mr. vasu in jb gupta new and old series so many mistakes r there ……it’s true u can also ask u r friends they will also says same thing…so if u have ace material see in that only they will give correct ans surely
Mr. kartheek
19)3 chords
34)c(t-1)u(t-1)
is correct both are gate previous questions i see in ace previous solution to the gate papers pakka correct
Mr.raj r u getting really 85+…………..
hi friends ap genco i am getting 65-69 i am belongs to BC-D 6th zone
Getting around 80 in transco 63 in genco
Raj if u get above 85 u wil be in the top 3 . . . U get job in any region in ap . . . .
iam getting btwn 85 to 90 is thr any chance???????
y noone is talking about apgenco?
can any one tell me the appr. cutoff for apgenco electrical woman non local? i got 63 is it enough or not
Friends 85 may be maximum marks this time … I will get 75 around … zone 4 ..bc d
iam gettin 63 in apgenco….wt abt u?
K guys what abt apgenco . . . Any one xpecting above 65 marks hmmm , .
Krishnam actualy chords doesnt mean nodes ,the tree branches are called links r Chords k .. cool ans is 3 only. .
to karthik,R nt cancelld any where,condidering approx. ripple current,R is negligible when compared to L.but in ques.they asked,actual ripple currnt depends on what?
chords ques. in made easy book,4 is crrct,chord they taken as nodes.
Guys wat ever the ans posted in books . . U know the sol and u can come to know which ans is crct and which is wrong . . Guys from cncpt E,P/4 is the crct .and 3chords is crct . . And bse loads r nuclear and runoff. . And abt mosfet i dnt know bcoz poor in analog concept . . . But in ace it is given as zero . . . And ya peak time and overshoot both decrease i agree with it . . . Sry if iam rude . . . Cool
Actualy guys Wat vasu told is crct . . They dntconsider our ans. . They jst go with book solution they ons from where the que are given . .i heard they consider jb guptha objective . . . I got around 78 zone .
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