L & T Placement Paper

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,





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



10. buccholtz relay is used for



11. lightening arrester is used for



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 voltage



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