L&T(ECC) Placement Paper Whole Testpaper NIT Trichy-29 Jul 2008
Hai, I am VinodKumar, from NIT TRICHY,
On 29-07-08, L&T(ECC) came to our college for campus recruiting,
The selection process is different for graduates and post graduates,
I am doing M.Tech (electrical), for one hour they conducted test for 60 marks,
30 one mark,15 two marks, no negative marks.
The test was completely based on respective subjects only; they are allowing mechanical, civil, environmental engg students along electrical.
The subjects they covered are power systems, power electronics, electrical machines,
Electrical measurements, simple logical circuits,
I remembered only few questions
1. Convert 16 into binary form ??..
2. In which gate o/p is 1 when all i/p are 1
3. What is moving coil ammeter reading, if supply is (10+15 sin 314 wt),
4. If voltmeter reads 100V,if we want to measure 150 what we have to do
5. Y-delta starter used in induction motor for???..
6. In a balanced Y connection if VAN=400at 60,what is VBN ?????..
7. for unity TMS 10 sec, what about 0.5 TMS ??????ans: 10(chck it).
8. 400V,15 kW,4%slip,50 Hz, 4 pole what is the torque,
9. what r the factors influencing change in torque &speed
12. what is the power dissipated in i=10+5 sin 314wt for 2ohm resistor
14. what should be the impedance value for 3-4j,for max power transfer
15. if current required for triggering thyristor at -30 degrees(temp) is 80 mA, what is the current required at 60 degrees.
16. Question regarding thevenins resistance
17. Fourier series expansion like periodic signal ??..
18. Question regarding reactive power compensation ???
19. Question regarding positive sequence currents ?some L-L-G fault occur on 3 ? ph network Ia current??like
20.400v,50ohm resistor , inductive reactance 100ohm , circuit to be resonance ,find the voltage across capacitor
21. what is the ideal power loss for 1.1mH & 11.86 nF, length is negligible
22. sync motor is used for
23. In Q factor which resonance is used?ans: series.
24. regarding p.u. values
25. regarding voltage bus parameters (3 ph networks)
26. charging of capacitor
27. reactive power compensation
28. Poles location
29.I controller is used for ?????..steady state error reduction?
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