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i-t-b-h-u-7-aug-2012


L & T ECC PAPER ON 7th AUGUST

The paper was fully Technical from core mechenical.

Sample Paper

The paper was consisting 30 questions of 1 mark and 15 questions of 2 marks, all of objective type. 

1. Which of following software is not used for FEM.

2.Condition for perfect structure (ans.m=2j-3)

3.One question from iron- carbon diagram.

4.which is used vfor hardening of brass.(hardenig methods).

5.which is most suitsble theory of failure for ductile materials.

6.One from solidification time of casting.

7. one from rack angle sticking friction.

8. one from chip cut thickness.

9. one from life of bearings.

10.one from heat transfer through multislabs and one from fins.

11.one question from linkage mechanism.

12.one question from ISO 9000.

13. One question from condensation temp in refrigation cycle.

14. Two questions from moulding techniques.

Section B

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

27. reactive power compensation

28.  Poles location

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

 

Section C

1. fllow is directly proportional to?

2.what is  newton's first law?

3. what is pascal's law?

4.strain gauge workes on which priciple?

5.capacitance is equal to-

ans- capacitance= permiability*area/distance between plates

6.which is 3rd layer of OSI MODEL?

7.emf generated is equal to?

 ans= phi*Z*N*P/2*A

8.which is used without contact?

ans= ultrasonic.

9.which is not used for measuring temp?

ans= abbuno(another was related to temp measurement)

10.PID stands for?

11. PID is used for?

12.which is used for measurement of temp upto 1200 degree ?

13. 200degree celsius is equivalent to how many kelvin?

14. what is universal gas law?

ans=   pv= n*r*T

15.which is used for 1:1 communication.

 

 

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