NTPC Last Years Model paper

I am looking for NTPC Limited Previous year Electrical Engineering Question Paper, please provide here???

[Kiran Chandar]

You need NTPC Limited Previous year Electrical Engineering Question Paper, I am giving here:

1. What is causal system?
2. Shunt reactor is used in EHV transmission line for
3. 20w, 40W, & 200w lamps are connected to three phases if neutral wire breaks then
which lamp will fuse first? 1) 20 2)40 3)200 three lamps will fuse together.
4. Synchronous machine can be operated at both lagging and leading power factor
5 What does synchronous speed mean?
6. Frequency of emf generated per rotation of rotor is equal to.
7. DC machine having wave winding is wounded as lap winding what will be the effect
on emf generated
8 Which is remain unchanged in transformer action?
9. In transformer windings are connected.?
10. In general how transformer is rated?
11. What is given on the name plate of motor? 1) KW 2) KVA 3) output shaft power
12. Short circuit test of transformer gives what?
13. Transformer core are laminated for what purpose?
14. What is supply voltage for heavy industry .1) 33KV 2) 11KV 3) 132 KV 4) 66KV
15. Basic structure SCR as a two transistor i.e. how they are connected?
16. What is Triac?
17. System admittance is (G+jB) what is reactive power absorbed if the voltage is V KV?
(1) V (square)*B (2) V (square)*g .
18. In series R-L circuit what is phase difference between the voltage drop across R and
L?
19. Power factor is cosine (delta ) delta is the angle between 1) phase voltage phase
current 2)
Line voltage lone current 3) phase voltage line current 4) line voltage phase current.
20. Laplace of exp (-at)?
21. For series R-L-C circuit the load will be capacitive if the frequency is 1) greater than
the resonant frequency 2) less than the resonant frequency 3).
22. In Wiens bridge which circuit elements determine the frequency range?
23. What is the output if two booster having duty cycle K and (K-1) are connected in
series?
24. If a DC shunt motor is loaded from unloaded condition what will be effect of on
terminal voltage?
25. A second wire system having one pole one right half of the s-plane. When the system
will be stable?
26. A system having repetitive pole what will be effect on the gain at the cross over
frequency?
27. Hollow conductor is used to reduce corona loss how does it reduce the loss?
28. In DC machine how voltage is related to flux?
29. Nature of current and voltage in the armature and at the terminal in DC machine.
30. Motor acts on the principle of ..rule
31. Which instrument measure both ac and dc?
32. How the rotation of induction motor is reversed?
33. If 3-phaseof a 3- phase balance load are reversed what will be the effect on the line
current?
34. If the rating of VAR absorber is 50MVAR at 400KV. What will the VAR absorbed
by the absorber at 300KV?
35. In regenerative breaking of DC series motor what is done?
36. Definitions of Fourier transform?
37. Laplace of f(t) is F(S) what is Laplace of f(t+T) .
38. Z-transform of sampled function x(n) for n>0.
39. Laplace transform of impulse function.
40. Z-transform of unity.
41. How many slip rings are there in 3phase synchronous motor?
42. How the speed of synchronous motor is controlled?
43. Speed control of induction motor?
44. When power supply is supplied to heater coil it glows while simple wire does not
glow. Why?
45. A synchronous generator having inertia constant 4 and having rating of 100MVA.
What will be energy stored by the machine?
46. A transformer having ratio 20:1. The secondary load is 0.6 ohm and the voltage
across it is 6 V what will be the primary current?
47. A RC circuit having r=0.8ohm, c=2.5micofarad what will be the time constant?
48. Find load impedance if c=0.1 micro farad?
49. Two capacitors connected in series the equivalent capacitance is 0.03uf and when
connected in parallel the equivalent capacitance is 0.16uf find out the ratio of the two
capacitance?
50. An L-c circuit having frequency 1/sqrt (LC) what will the equivalent impedance?

Hello sir, I want last years model question paper of NTPC placement? Is there any one has present any last year question paper of NTPC then please provides me?

[Shaleen]

NTPC model paper based on following subjects:
Knowledge Test in respective Discipline
Reasoning.
Quantitative Aptitude.
English

Here the NTPC Executive Trainee Placement Paper:

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

2. Lower useful input limit of a transducer is determined by?

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

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

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

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

7. O/P of a delta modulator when a ramp input is fed to it.

8. Creeping occurs in energy meters because?

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

10. Which layer in the OSI model is concerned with printer buffering,etc: (network/session/transport)?

11. Relation between laplace and z-transform: s=z/ s=ln z/ s=( ln z/T) /?

12. Maximum and minimum probability error among ASK,PSK,FSK,DPSK etc

13. Which of the following is a non linear modulation scheme: PAM/QAM/PCM/?

14. Which photodetector has output affected by own intrinsic noise: (PN/APD/PIN/all).

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

16. In an ECG instrumentation amplifier the differential gain is provided by (1st stage/2nd stage/mismatched resistors/output stage.)?

17. EMG signals are of the order of ?

18. Computer assisted tomography is used for?

19. Which is an effective measure of the noise related performance of an amplifierSNR/noise ratio/thermal noise/shot noise.)

20. Distinction between FM and PM at high frequencies.

21. Which of these has the least propagation delay RTL/ECL/I2L/CMOS.

22. JFET can operate in (depletion/enhancement/both/none of the above modes.)?

23. Why is LCD preferred to LED.?

24. How will 0.6973 be displayed on 10 V range of a 4 ½ digit multimeter.?

25. In a twisted ring counter the initial count is 1000. after the 4th clock pulse its state will be?

26. For parity bit checking which of the following gates can be used XOR/NAND/OR/XNOR.

27. How does a radioactive level gauging system work?

28. A capacitive transducer measuring level works on the principle of change in distance between plates/change in dielectric strength/?

29. Reproducibility of measurements is called (accuracy/precision/linearity/none of these.)?

30. What happens when the RET instruction is encountered by 8085