# LnT-ECC Technical Aptitude Paper

Posted on :21-04-2016

Q1. Convert 16 into binary form ……..

Q2. In which gate o/p is 1 when all i/p are 1

Q3. What is  moving coil ammeter reading, if supply is (10+15 sin 314 wt),

Q4. If voltmeter reads 100V,if we want to measure 150 what we have to do

Q5. Y-delta starter  used in induction motor for………..

Q6. In a balanced Y connection if VAN=400at 60,what is VBN ……………..

Q7.  for unity  TMS 10 sec, what about 0.5 TMS ………………ans: 10(chck it).

Q8. 400V,15 kW,4%slip,50 Hz,  4 pole what is the torque,

Q9.  What are the factors influencing  change in torque &speed

Q10. Buccholtz relay is used for

Q11. Lightening arrester is used for

Q12. What is the power dissipated in i=10+5 sin 314 watt for 2 ohm resistor

Q13. What should be the impedance value for 3-4j,for max power transfer

Q14. if current required for triggering thyristor at -30 degrees(temp) is 80 mA, what is  the current required at 60 degrees.

Q15. Question regarding  thevenins resistance

Q16. Fourier series expansion like periodic signal ……..

Q17. Question regarding reactive power compensation ………

Q18. Question regarding positive sequence currents …some L-L-G fault occur on 3 – phone  network Ia current……like

Q19. 400 v, 50 ohm resistor , inductive reactance 100 ohm , circuit to be resonance ,find the voltage across capacitor

Q20. What is the ideal power loss for 1.1mH & 11.86 nF, length is negligible
voltage

Q21. Sync motor is used for

Q22. In Q factor which resonance is used…ans: series.

Q23. Regarding p.u. values

Q24. Regarding voltage bus parameters (3 ph networks)

Q25. Charging of capacitor

Q26. Reactive power compensation

Q27.  Poles location

Q28. I controller is used for ……………..steady state error reduction…

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