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| ABB Placement Paper Held On 2 May 2004 At Vadodara Posted: 12 Nov 2010 07:25 PM PST
Paper: ABB Placement Paper Held On 2 May 2004 At Vadodara (Technical) (1) in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be the resultant frequency. (a)less than 50 (b)more than 60(c)in between 50 & 60 (d)none according to our conclusion answer will be none because if we apply two frequency component resultant frequency we can not say with such an ease. U should confirm the answer Ans:- no change since it is a parallel combination. 3.why we don,t like flashover in transmission line (t-line)- (a ) it may create earth fault ( b ) it reduces the life of insulator….. 4.total no of strands in a acsr conductor is 81, then what is the no. of conductor in its outer layer….(a)36 (b)18 (c)24…….Also read some more on acsr. 5.Two questions based on p.u. calculation like , p.u. calculation is given with respect to some old base and u have to calculate it with reference to new base. 6.which table is referred for sag calculation- Ans:- stringing 7.in a R-L ckt a ac voltage is applied , such that instantaneous power is negative for 2ms, then what will be the power factor. (a) 9 deg, (b) 18 deg, (c) 36 Deg 8. In an incandescent lamp (a) luminous intensity is more than non-luminous intensity (b) ,, ,, ,, less ,, ,, Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm it further. 9. In which motor no-load to full-load diff. is lowest (a) series motor, (b) shunt motor, (c) Compound motor Ans: (b) 10. In a 60Hz induction motor full load speed is 850 rpm then what is the Synchronous speed. (a) 900 rpm, (b) 950 rpm, (c) 1600 rpm Ans: (a) 11. A sync. Motor is running at synch. Speed, if al of sudden D.C. excitation is removed, then (a) it will rotate at slip speed, (b) it will stop, ( c) it will continue to rotate at sync. Speed Ans: (a), because actually it will acts as Induction motor. 12. A transmission line is designed for 50Hz, 440KV. If we want to transfer power at 60Hz, 440 KV, then the power transfer capability will (a) decrease, (b) Increase, (c) None Ans: (a).as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque angle. 13. Increased rotor resistance in rotor ckt of induction motor is related with (a) high starting torque, (b) more speed variation Ans: (a) 14. In the formulae E = 4.44 f N Ô, Ô is (a) Avg value, (b) Rms value, (c) Maximum value Ans: (a) 15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then rms power is 16. Input impedence of MOSFET is Ans:- more than BJT 17. Remember truth table of AND, NOR, NAND, OR, EX-OR ETC… 18. What is Truth Table Explain? 19. Conversion of Binary number into Equivalent decimal No. 20. Megger is used for the measurement of (a) Insulation resistance, (b) Conductor resistance Ans: (a) 21. Form factor for sinusoidal as well as DC 22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is (a) short transmission line, (b) long, (c) medium. Ans: (a) 23. Improvement in power factor reduces (a) power consumed by consumer, (b) power generation, (c) both a & b Ans: (c) 25. No-load test for Synchronous motor, the graph is drawn Ans:- stator open ckt emf Vs field current 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) 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 32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is Ans:- pure resistive ckt 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 37. Read about surge impendence of over-head and under-ground cable, Surge impedence formula = sqrt(L/C) |
| Fresher Jobs National Highways Authority of India Recruitment Posted: 12 Nov 2010 09:51 AM PST National Highways Authority of India Recruitment – www.nhai.org: National Highways Authority of India (NHAI) has given a detail advertisement for the recruitment of Site Engineers. Candidates applying for the following positions should have all the basic qualification as mentioned in the main advertisement. So, candidates fulfilling the requisite criterion should go for the opportunity to get the position in the company. They regularly opens the National Highways Authority of India recruitment every year. The examination will be held this year as per the syllabus given in the notification issued by the National Highways Authority of India (NHAI Jobs). The selection procedure will be go through by written test followed by interview. The following are the information to see whether you are eligible or not. To get the complete detail about the vacancies / jobs go the main advertisement of the National Highways Authority of India Recruitment i.e. www.nhai.org. You can see the other National Highways Authority of India recruitment as per your qualification and eligibility. Address of National Highways Authority of India as on www.nhai.orgNational Highways Authority of India, About National Highways Authority of India as on www.nhai.orgThe National Highways Authority of India was constituted by an act of Parliament, the National Highways Authority of India Act,1988. It is responsible for the development, maintenance and management of National Highways entrusted to it and for matters connected or incidental thereto. The Authority was operationalized in February, 1995 with the appointment of full time Chairman and other Members. Main Detail about National Highways Authority of India Recruitment at www.nhai.orgSite Engineer
Qualification:
Complete Information go to: Advertisement and Application Format Closing date for submission of Application: 01/12/2010 Complete Information about National Highways Authority of India Recruitment at www.nhai.org The above information is only to see whether you are eligible or not. To get the complete information about National Highways Authority of India Recruitment – www.nhai.org, you have to see the main advertisement. Application format and application form has also given in the main advertisement of the company. Interested candidates can apply as per the rules and regulation. To get the complete information about the recruitment in National Highways Authority of India, please enter you email id in given below form… |
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