NTPC Mechanical Engineering Question Papers

Will you please give me question paper for National Thermal Power Corporation (NTPC) Mechanical Engineering examination ?

[Kiran Chandar]

Here I am giving you question paper for National Thermal Power Corporation (NTPC) Mechanical Engineering examination in a file attached with it .

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 Wien’s 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.


1)Gain bandwidth product of 2 stage CE amplifier compared to single stage
a). greater b). lesser c). same etc

2)Early effect in transistor leads in
a). Fast switch b). slow switch etc

3)MOSFET acts as a
a). Resistor b). inductor c). capcitor etc

4)Normal PH is
a)7 b)2 c)5 etc

5)Gave number of bits as 8 and max voltage as 100V asked to calculate resolution

6)strain guage working principle
a). resistor c). capacitor etc

7)Class AB property
a). More efficiency b). avoids crossoverdistrotion

8)3-4 problems related to oscilloscope

9)Gave a simple block diagram asked to find TF

10)Gave discrete sequence asked to calculate DFT

11)x(at)——Ztransform—
a)1/aX(z/a) etc

12)Peak overshoot 100% calculate damping factor
a)0.707 b)1.732 c)0.5 etc

13)gave transfer function asked to calculate phase crossover frequency

14)If modulating frequency doubles then BW of FM becomes
a). twice b). half c). same etc

15)Gave unmodulated carrier power and modulated carrier power asked calculate modulation index

16)In TDM system no: of telephone channels give asked to calculate o/p freequecy

17)3 to 4 problems on bridges and instrumentation

18)If range is more it leads in
a). More precision b). more accuracy c). more error

19)2to3 problems on ADC and DAC to calculate the number or output bits reqd

20)Problem based on channel capacity theorm

21)Vectorred interrupt among the following
a). RST 6.5 b). RST 5.5 c). TRAP d)INTR

22)Memory of 64x1k available 4 such memory clubbed together with single address line give
a)16x16k b)256x1k etc

23)For a stable system
a) h[n]!=0 n>0
b) h[n]!=0 n<0 c) h[n]=0 n0

24)Wn in DFT a shifting property was asked

25)Wheat stone bidge used for measuring
a) resistor b) inducator etc

26)RLC ckt response
a) exponentially increasing b) decreasing etc

27)FET is a
a) VCVS b) CCCS c) VCCS d) CCVS

28)Gave a TF asked to identify the poles and zeroes

29)Gave a characteristic equation asked to find number poles in right side

30)Optical wavelength range asked

31)LASER abbreviation———

32)Schotky TTL diode is used to reduce
a) delay b) gates c) power d) none