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7th August 2014, 11:29 AM
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Join Date: Apr 2013
Re: HAL Assistant Engineer post sample question papers

Here I am giving you information about exam pattern and paper for assistant engineer post organizes by Hindustan Aeronautics Limited below :

Exam pattern :
Total questions asked in exam is 160
Questions are divided into sections as follows...
General Engineering - 25 questions.
General Awareness - 15 questions.
Specific Discipline - 120 questions.
Each question carries 1 mark each and there is no negative marking...

Question paper :
Question paper :
1) What is the distance between the EHV lines?
a)8m b)11m c)4m d)14m

2) At present how many HVDC lines are there in india?
a)none b)one c)two d)more than two

3) Where is the nuclear located in following places?
ans: i dont remember the answers, but one of them is thalcher(orissa)

4) What is the approximate peak overshoot for a unity feedback system with damping
factor 0.6?
a)10% b)5% c)15% d)20%

5) What is the distance between the EHV lines and earth?
a)8m b)11m c)18m d)15m

6) On no load in EHV lines what is the relation between receinving and sending end
voltage?
ans: receiving end voltage > sending end voltage

7) What is the surge impedance loading of 400kv line?
ans: 4002/400ohms =400watts

8) similar question with surge impedance given as 160 ohms
ans: 1000watts

9) If both the juctions of transistor are forward biased, in wat region transistor works
ans: saturation region

10) Where is the hydel power plant located in following places?
ans: I dont remember the places

11) self GMD is used in the calculation of_______
a) inductance only
b) inductance and capacitance
c) capacitance only
d) none

12) What is the GMD if the distance between the lines are 6m,6m,12m?
ans: 7.058m( approx)

13) Zero sequence currents doesn’t exist in the following fault
a) L-G
b) L-L
c) L-L-G
d) L-L-L-G
Ans: d

14) To avoid arcing connect sutable value of ________ in earthing.
a) capacitance
b) indunctance
c) resistance
d) susceptance

15)There are two to three questions based on Laplace and Inverse Laplace transforms

16)In the following type of conductors the corona is minimum
a) circular
b) stranded
c) helical
d) rectamgular
ans: c

17)When do two wattmeters show same value of opposite readings in two wattmeter
method
a) 300 lag
b) 600 lag
c) between 600 and 900 lag
d) zpf lag
ans: d

18) Schering bridge is used to measure
a) frequency
b) inductance
c) capacitance
d) mutual inductance
and: c

19) What is the value of resistance when both length and diameter of the wire are
doubled?
ans: halved

20) There is one questions asked on euler’s formula..

21) What is the Laplace transform of unit ramp signal?
ans:1/s2

22) What happens to the value of inductance when self GMD is doubled?

23) At what frequency corona loss is more?
a) 50Hz
b) 60Hz
c)
d)

24) What is the largest rating of alternator manufactured in india?
a) 1000MW
b) 500MW
c) 1200MW
d) 250MW
ans:b

25) The response of an RLC circuit for impuse input?
a) exponentially raising
b) sinusoidal
c) exponential falling
d) parabolic
ans: c

26) What is the easier method for finding no. of poles in the right half of s-plane?
a) Niquist plot
b) R-H criterion
c) Root-Locus method
d) Polor plot
ans: b

27) How many no of poles located in the right half of s-plane for the characteristic
equation…

28) Burden of current transformers is measured in..
a) Watts
b) Volt Amperes
c) Ampere Hours
d) Joules

29)What is the gate used to get high output when all the inputs are low?
a) NOR
b) NAND
c) Ex-OR
d) Ex-NOR
ans: b

30) Large no of thyristors are used in HVDC transmission to improve______
a) current rating
b) voltage rating
c) Thyristers are available at high ratings
d)

31) What is the line current of a circuit when the current transformer of 1000:5 rating
measures 4Amperes?
ans: 800A

32) If the time delay of relay with TMS setting 0.1 is 10 sec, then what is the time delaty
when the TMS setting is changed to 0.5

33) How many no of flip-flops are required to get 16 bit counter?

34) _________is connected to reduce frequency errors in ammeter.
a) shunt capacitor
b) series inductance
c) shunt inductance
d)

35)What is the value of ripple factor in Half Wave Rectifier?
a) 1.11
b) 0.8
c) 1.21
d)

36)The principle used in megger?
a) electrostatic effect
b) magnetic effect
c) Induction effect
d)

37)In electrodynamometer type wattmeter the error is due to..
a) pressure coil inductance
b) pressure coil resistance
38) In the following locations where is hydal power plant is not located?
ans: i dont remember the places

39) In distribution lines_____
a) X/R10
c) X/R>1
d) X/R<0.01

40) In EHV lines _____ a) X/R=10 b) X/R=100 c) d)

41) What is the speed of 2 pole alternator at 50Hz frequency? ans: 3000rpm

42) What is the equivalent decimal no of (624)8

43) What is the binary equivalent of 6.25

44) What is the value of A+AB+B¯ ( B bar) ans: 1

45) What are the avg and rms values of full wave rectifier ans: 2Vm/pie, Vm/21/2

46) There is one question based on rank of matrix

47) What is the equivalent of cos(wt+18.750) a) sin(wt+71.250) b) sin(wt-71.250) c) sin(wt+18.250) d) sin(wt-18.250)

48) The three harmonics will be in phace with each other?_____ a) 3,5,15 b) 2,4,6 c) d) ans: a

49) The line current will be equal to phase current in______ ans: delta connection

50) In windmills the frequent problems occur in______ a) mechanical system b) blades c) electrodynamic system d) electric system

51) The machine used in windmills is______ a) alternator b) induction generator c) d) ans: b

52) Insulators in EHV lines are designed based on_____ a) switching voltages b) peak voltages c) corona d) lightning voltages ans: a 53) The value of restriking voltage depends on______ a) inductance of line b) capacitance of line c) both d) none

HAL assistant engineering exam paper

1. The purpose of feedback transformer & diode in complementary commutated inverters is to-

2. In order to obtain static voltage equalization in series connected SCR’s connection r made of- (this question repeated) (i.e. 2 times same question Haaa)

3. In phase controlled rectification PF=

4. Why sector winding is used in synchronous motor?

5. A calculation of making current where MVA & KV was given.

6. The o?p voltage e1 & e2 of 2 full-bridge inverters added using o/p transformer. In order to eliminate 5th harmonic from o/p voltage, the phase angle between e1&e2 will be-

7. A single phase fully controlled line commutated ac-dc converter operates as an inverter when-

8. An SCR has half cycle surge current rating of 3000A for 50Hz. One cycle surge current will be. (double of that)

9. When compared to an symmetrical thyristor, the turn off time & reverse blocking voltage of an asymmetrical thyristor will be-

10. A step-up chopper is feed from an 220v dc source to deliver a load voltage of 66o v. If the non conducting time is 100micro-sec then reqd pulse width will be. (get duty cycle only)

11. There were some 5-6 numerical problems which I could not remember totally but they consist of firing angle & power transfer of inverter, SCR. Go llok for that.

12. Relay current setting & Ct ratio was given you have to find out Relay Pick up Current.

13. One question from Dc shunt motor- like a resistance is added of 4.5 ohm in series with arm where rest of arm is 0.5 ohm. Machine is supplied 220v. find out the null current.

14. In aptitude part see through series completion there was a 5-6 no of that.

15. No aptitude questing like avg, %, proff-loss, prob, etc.

16. Sentence correction 2-3.

17. Why rotor of SCIM is skewed?

18. Magnetostriction increases-

19. Good transformer oil contains how much amount of water in ppm?

20. Lightning over voltage create how much volt?

21. K/s(s+1)(s+5) then find out the value of K so that system become stable.

22. There was a question from definition of Nyquist criteria.

23. Standing done up to the frequency range of? (audio)

24. If a square waveform if given to the supply side of a 2wdg transformer its o/p waveform will be-

25. SC test done on transformer because-

26. If a transformer is operating in .8 PF lag & at efficiency of .9, if now P is .8 lead the efficiency will become.

27. Interpoles are connected for?

28. Dielectric strength of air-

29. A alternator is connected to a grid. Now its prime mover is go slow by ½. Change in its exiting current to held in synchronism.

30. Is the strength of capacitor in LPF is increased the op voltage will-

31. The voltage of a generator and an infinite bus are given 0.92, 10 deg & 1.0, 0 deg resp. the generator acts as a –

32. A wave will not experience any reflection when impedance of line is equal to- surge imp

33. Power transmitted is related to system voltage as-

34. Delay creator ckt name (multivibrator name actually)

35. In tachogenerator adjustment is done by-

36. Surge wave is attended by- (C,L,R)

37. There was 10 question related to measurement-

38. Read all electrostatic instrument related question from any competitive exam book.

39. Lowest reading in moving iron meter is-

40. In galvanometer damping is provided by-

41. In electrodynamic meter a battery & a resistance is provide for-

42. Megger is used for-

43. A question like an ac is applied against a moving coil meter it will reads-

44. Rectifier type instrument measureswhat value – (Rms)

45. Advantage of electrostatic instrument is-

46. Creeping occurs because-

47. Why 2 holes are drilled oppositely in disc of energy meter.

48. Energy meter is a _____ type equipment (recording)

49. There was a question related to selection of a voltmeter based on accuracy-

50. Advantage of hay bridge over anderson bridge-

51. Inductance is measured by – (all the 3 bridge name) .

52. Potentiometer is which type of instrument-

53. Which type of motor is used in refrigerator?

54. Reflection coefficient based problem 1

55. Corona ’s advantage-


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