NTPC Electrical previous year placement papers

Hii sir, I wanted to get a job in NTPC please provide me the previous year aptitude test paper for my better preprations ?

[Saksham]

As you asking for the previous year aptitude test paper of NTPC electrical here I am providing you the past year apptitude test paper of the NTPC the question paper is given below:

1. Expression for d(n): u(n)-u(n-1)/ u(n-1)-u(n+1)/ u(n)+u(n+1)/...

2. Numerical on a photodiode: to calculate the responsivity/sensitivity when a specified no of incident photons cause a specified no of electron generation.

3. For a radioactive sample which decays to 12.5% of its initial value in x days, the half life is given by..

4. Connect two 1o resistors in series, then connect two 1h inductors across one of the resistors such that the ckt looks like a 1o resistor in series with a ?-section of a resistor and two inductors. With the series resistance on the I/p side, calc the transfer function of this ckt
5. Ac signal conditioning is used for inductive and capacitive/resistive/piezoelectric transducers/all of the above.

6. Lower useful input limit of a transducer is determined by..

7. Air-cored inductors are used for low frequency/high frequency/equal frequency operations.

8. Given 4 pole-zero plots identify which one corresponds to the driving point impedance of a series resonant ckt.

9. Given four unit-circle plots identify the one corresponding to a bandpass filter.

10. The sequence (2,3,4,3) is circularly even/circularly odd/circularly zero/both circularly even and odd.

11. Z-transform of 3n u(n).

12. Match the following with their characteristics: led/lcd/nixie tube/optical fibre.

13. A 4 khz signal is sampled at thrice the nyquist rate and sent through a channel with error =1%. Calc the bandwidth of the channel.

14. Given an op-amp ckt obtain an expression for o/p voltage.

15. No. Of encirclements made about the origin of the nyquist plot of the open loop tf:1/[(s-1)(s+2)(s+3)].

16. Given a two port network in the form of a t find o/p admittance in terms of y-parameters.

17. For a repeater in a pcm cable identify the correct sequence of actions amongst threshold/equalization/etc.

18. O/p of a delta modulator when a ramp input is fed to it.

19. Steady state error with ramp I/p for a type-0 system.

20. Creeping occurs in energy meters bcoz...

21. Ultrasonic method of flow measurement cannot be used in liquids with air bubbles/has less attenuation in air compared to liquid-identify the false statement (if any) among these.

22. Major cause of losses in a fibre optic cable: dispersion/total internal refraction/presence of core and cladding/..

23. Which layer in the osi model is concerned with printer buffering, etc: network/session/transport/..

24. Given some function f(j?) calc its inverse ctft.

25. Relation between laplace and z-transform: s=z/ s=ln z/ s=( ln z/t) /..

26. Maxm and minm probability error among ask,psk,fsk,dpsk etc

27. Which of the following is a non linear modulation scheme: pam/qam/pcm/..

28. Match the following functions: e-t , e-t + et, sin(pt) with causal and stable system, causal and unstable system, etc.

29. Given a ckt with a 50 o resistor in series between two voltage sources of 10 v and 5 v magnitude calc power delivered by 5 v source.

30. Laplace transform of e-3tu(t)+e2tu(-t).

31. Which photodetector has output affected by own intrinsic noise: pn/apd/pin/all.

32. Inverse laplace transform of 1/s2[d/ds(e-3s/s)]

33. When I mode is added to proportional control system stability increases/ decreases/ steady state performance deteriorates/damping increases.

34. Reset control is another name for integral/derivative/proportional/... Control.

35. Time response of system having transfer function 625/(s2+25) will be of the form..

36. Given some transfer function calc the peak response time.

37. The nyquist sampling rate of the function [sin(at)/t]2 will be..

38. The feedback topology that results in increased I/p and o/p impedance is current series/voltage series/current shunt voltage shunt.

39. Numerical on cardiac output calculation given heart rate and volume per beat.