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__NTPC Previous Year Question Papers:__

__NTPC Previous Year Question Papers:__

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__NTPC Previous years solved question papers:__

__NTPC Previous years solved question papers:__

**No of Questions: 170**

**Technical -120**

**Aptitude-50**

**Time limit: 2 Hours**

**In Aptitude section Refer RS aggarwal book is enough**

**Technical Section : Good in basics, Time management important factor**

**The questions were from following topics-**

10-12 Questions about microprocessor(8085)

3 Questions about RS232 standard

7-10 Questions of GK

4-6 Questions on opamp

10-15 Questions on Digital Communications

2-5 Questions on microwaves

15-20 Questions on Analog Devices

20-23 Questions on Digital Electronics (flip
flops,gates,mux,no system etc)

1 Questions on ISO OSI Model

5-8 Questions on Control System

10-12 Questions on Signals and their Processing

__English Language:__
1. Passage

2. Word meaning based (antonym and synonyms) fetter,
fester, lucid, anomaly, elucidate etc

3. Word analogy based quqestions

4. What is a tunnel diode

5. What is a Zener diode

6. Effect of + and – feedback on stability

7. Composition of gobar gas

8. Function of differential in the vehicle

9. Function of stack register

10. Fun of instruction pointer

11. Fun of rst6.5,7.5

12. Wht is an interrupt

13. Output vtg calc on op amp

14. How a pulse train can b generated using registers

15. Conversion of oct to hex,hex to binary

16. Fun of quantizer in pcm

17. Why fm is less prone to noise

18. Fun of limiter in detection of FM

19. What is envelop detector

20. Phase shift of 1/s^2

21. Signal limited to 1000 hz sampled at nyquist rate.
quantizer has 128 level .calculate the bit rate of the system.

22. 1.5 V battery supply same power to R1 and R2
separately(R1>R2).calc the internal resistance of battery

23. A wire is cut in two halves. one half is again stretched
to the twice of length .calc the resistance.

__NTPC PAPER 2008:__
* An ice block submerged in the water, if the ice melts
level of water (increase, decrease, remains same, none)

* Simply supported beam with w point load at the
middle, max. bending moment? (wl/4)

* Simply supported beam with UDL ,max.deflection
(wl4/384EI)

* Cantilevel beam point load at tip,max.bending momemt
comes at (end)

* When bearing life L10 represents (bearings
10%survive,bearings 10% fails, none )

* For welding high carbon steels which type of flame is
used (oxidizing, carburizing, neutral, none)

* Arrange the following cutting tools in decreasing
order of machining hardness…Ceramics

* When P1 and P2 are the loads acting on bearings with
life L1 and L2 then L1/L2=? L1/L2={P2/P1}10/3

* Product simplification does not mean? (Product
characterization)

* Which of the following process has the most scope in
manufacturing? CAD/CAM, CAM, CIM, All the above.

* Concurrent engineering means? (Manufacturing,
designing, both, none)

* Which manufacturing process yields higher output and
increases worker productivity- (process layout, line+process, functional
layout)

* 18-4-1 represents-, Tungsten-Cr-Vn

* For which material is negative allowance rovided-(Graphite,steel,bronze,cast
iron)

* What is the recrystallisation temperature of tin-
(60,300,1000,none)

* What is the purpose of borax in soldering-

* Top gates are provided in which type of
casting-(Shallow casting,simple,complex,none)

* Which statement is true regarding simple gear
trains-(i/p and o/p shafts r fixed, each shaft has 2 gears, i/p & o/p
shafts r moving)

* What is the purpose of normalizing- (Refining of
grain structure)

* As the grain size is decreased-(Hardness
increases,corrosion resistance decreases,both)

* Isothermal gas is filled in a vessel at a pressure P
and temperature T then considering the compressible forces as the height
increases pressure ??(linearly increases linearly decreases exponentially
increase )

* A bottle is filled with water and air and is tied to
a string and is rotated in horizontal direction. Then in which direction will
air bubble travel?

(bottom,neck,uniformly spread)

* A empty bottle(in vaccum) filled with a gas at temp T
and press P when the pressure of bottle reaches P temperature of the gas is _?
(T,T/K,TK)

* Bearing somerfield number _ with load on bearing?
(increases,decreases,no change)

* Critical radius for a sphere is-(2k/h)

* Critical radius exist for_
(spherical,cylindrical,both,slab)

* Convectional resistance/internal resistance is called
(biot number)

* Nusselt no. is? (hl/k)

* EOQ=?

* Which statement is true regarding critical path
method? (i only one critical path exists for a network, more than one with same
duration,)

* Shipment cost,inspection cost,storage cost comes
under_ (carrying cost ,holding cost,)

* Ischronous governers sensitivity is- (zero,infinite)

* Self energized brakes are-(friction moment acts in
the direction of application of force,opposite to the direction of force, does
not need a force to act ,)

* The ratio of heat capacities for evaporator and
condenser is_ (Zero,infinity)

* When steam and air mixture with partial pressure 0.06
and 0.07 enters a condenser what is the condenser pressure? (0.06,0.07,0.53,0.03)

* In pulverized burning of coal heat transfer from
boiler to water occurs through_( predominant radiation, convection, conduction,
conduction+convection)

* Rankine cycle efficiency for same parameters
increases mostly with_(reheat, regeneration, super heating )

* Ericson cycle with all reversible processes
assume_(carnot cycle,stirling,brayton

* Air delivery tank at outlet of reciprocating
compressor is provided for_ (provide constant pressure, avoid cavitation, )

* High speed centrifugal pump has _? (vanes faces in
forward direction side,backward,radial vanes)

* Thermal efficiency in decreasing order_? (Otto
cycle>dual cycle>diesel cycle)

* When a 1000 K body comes in contact with atmosphere
at 300K a loss of 9000 KJ heat is transferred. The net available energy
transferred is_

* When entropy of a system increases_? (unavailable
energy increases )

* Rolling is a process widely used for_?

* Tool nomenclature_?

* In francis turbine movement of steam?

* For low power consumption _? (rake angle should be
increased / decreased, nose angle increased/ decreased)

* Continuous chips occur in_? (High speeds,low
speeds,both,none)

* Primary forces in a reciprocating engine_? (fully
balanced, partially balanced, completely unbalanced, none)

* In proximate analysis pyrogallol is used for analysis
of which element_? (nitrogen,oxygen)

* Sulphur content in fuel greatly affects_? (corrosion)

* Heat transfer through radiation can be increased by_?
(decreasing emissivity and increases temperature of hot body)

* Which theory of failure clearly explains the failure
in case of ductile material? (Maximun shear stress theory or Guests or trescas
theory)

When a material is subjected to continuous cycles which
limit is being verified? (Endurance limit)

Where is stress concentration maximum? (notches, stress
reducing through cuts)

* Power transmitted through a belt drive_? P(T2-T1)

* According to Eulers theory crippling or buckling load
is ____ (Wcr = Cπ2EI/l2)

* During sensible heating, specific humidity_? (remains
constant)

* COP of a refrigerator is _? (greater than 1 )

* The maximum temperature in a refrigeration cycle is_?
(less than/greater than/equal to critical temperature)

* The pressure at the throat of the nozzle_? (maximum,min)

* For a statically determinate set of forces for
equilibrium_? (∑ f(X), f(Y), f(Z)=0,∑M=0)

* For a statically determinate set of forces- (there r
as many equations as the no. of unknowns)

* 1-2-3 analysis is used for_? (1.break even analysis,
??)

* A problem on mean time of service something like a
salesman has a rating of 120. considering 10% allowance time calculate the time
required to serve 120?

* A problem n determining time in a queue?

* Energy equation for a laminar flow is _? (Uniform and
steady ,non uniform and unsteady)

* Undercuts in welding occurs due to_? (low welding
current, high welding current)

* Work holding equipment in shearing?

* At the centre of a nozzle _? (Mach no<1 >=1;=1)

__Some Technical Questions from Previous NTPC Exam: 2009:__

__Technical Paper:__
1. Given four unit-circle plots identify the one
corresponding to a bandpass filter.

2. 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.

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

4. Connect two 1Ω resistors in series, then connect two
1H inductors across one of the resistors such that the ckt looks like a 1Ω
resistor in series with a Π-section of a resistor and two inductors. With the
series resistance on the i/p side, calc the transfer function of this ckt

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

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

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

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

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(jω) 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(πt) with causal and stable system, causal and unstable system, etc.

29. Given a ckt with a 50 Ω 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. AC signal conditioning is used for inductive and
capacitive/resistive/piezoelectric transducers/all of the above.

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.

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

41. Repeat ques 40 above for the classic 3-op amp
instrum amplifier.

42. EMG signals are of the order of mV/V/μV/…

43. Computer assisted tomography is used for…

44. Numerical on electrostatic instrument, to calculate
deflection given spring constant, torque etc.

45. To prevent loading of a ckt i/p impedance of a CRO
should bee high/low/inductive/capacitive.

46. Addition of a zero to a 2nd order underdamped
system results in increase/decrease of rise time and increase/decrease of peak
overshoot.

47. For PI ctrl we obtain improved bandwidth/improved
steady state performance/ worsened steady state performance/…

48. SNR of normal AM system is comparable/3 dB lower/3
dB higher/6 dB lower over DSB-SC and SSB system.

49. Which is an effective measure of the noise related
performance of an amplifier: SNR/noise ratio/thermal noise/shot noise.

50. Given baseband signal freq and carrier freq calc
which of the freq given will not be present for conventional AM.

51. Distinction between FM and PM at high frequencies.

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

53 Switching speed of CMOS is affected/unaffected by
changes in supply voltage.

54. Which of these provides a measure of heart rate
P/QRS complex/T/none of these.

55. Given a ckt of a logarithmic amplifier you had to
identify what ckt was it.

56. JFET can operate in depletion/enhancement/both/none
of the above modes.

57. When a BJT operates in saturation the junctions are
fwd biased/reverse biased/…

58. BIBO stability criterion implies that poles are
within/outside/on the unit circle.

59. For faithful amplification of low amplitude signals
the cut-off/active/saturation regions of a transistor is used.

60. Lissajous pattern of a signal rotates 36 times per
minute. if the oscillator frequency is 560 kHz then the unknown freq is…

61. % resolution of a 10 bit ADC.

62. To obtain 10 mV resolution on 5 V range how many
bit DAC is to be used.

63. Why is LCD preferred to LED.

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

65. Which of the following cannot be used for an
automatic feedback temp ctrl system thermocouple/thermometer/thermistor/IC
sensor.

66. Y(n)=X(-n+3) is an example of a linear/non linear
and shift variant/invariant system.

67. The falling body method is used to determine
viscosity/humidity/….

68. Which of these methods of viscosity measurement
gives greatest accuracy falling body method/rotating cylinder method/both/…

69. Some question on gas chromatography

70. A device having a rotor with 3 Y-connected coils
and a stator is likely to be a synchro/RVDT/control transformer/…

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

72. A 240 kHz signal is given into a 3 bit binary
ripple counter. The lowest o/p freq obtainable is….

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

74. Why is a BJT called so..

75. Identify the expression for gauge factor of a
strain gauge among the given options.

76. In a semiconductor strain gauge as tensile strain
is applied what changes take place in the n and p areas..

77. How does a radioactive level gauging system work…

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

79. For maximum power transfer in an AC circuit the
condition to be satisfied is ZL+ZS=0/XL+XS=0/none of these/….where l and s
refers to load and source respectively.

80. Find the transfer function from a block diagram.

81. Synchronous ctrs are preferred to asynchronous ctrs
bcoz they are faster/glitches at the output can be avoided/both/none of these.

82. The lissajous figure formed on an oscilloscope
looks like the English figure of 8. if the vertical channel input is 1 kHz the
horizontal input freq is….

83. IE=IC for a transistor in
saturation/cutoff/active/both saturation and active regions.

84. Reproducibility of measurements is called
accuracy/precision/linearity/none of these.

85. Which of these is not strictly a static
characteristic accuracy/precision/tolerance/linearity.

86. The shunt coil in a Q meter has resistance of the
order of mΩ/Ω/kΩ/..

87. For measuring inductance of high Q coils the bridge
used is Maxwell-wien/Schering/…

88. Which of these measures inductance in terms of
capacitance Maxwell and hay/Maxwell and Schering/hay and Schering/…

89. In a flip-flop with preset and clear inputs both
are applied simultaneously/clear is cleared when preset is applied/preset is
cleared when clear is applied/….

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

91. A 1024*8 memory chip needs how many address lines…

92. What happens when the PUSH instruction is
encountered by 8051.

93. In FM relation between no of sidebands w.r.t.
modulating freq

94. Numerical on DPSK.

95. A multiplexer accepts input data and provides one
output all the time/one output at a time/many outputs at a time/many outputs
all the time.

96. Pulse modulation is essentially a process of
multiplexing/….

97. Wave shape is altered by clipper/clamper/voltage doubler/amplifier.

98. 4 signals of frequencies 100,100,200 and 400 Hz are
sampled at nyquist rate and sent through TDM on a channel.the bandwidth of the
channel is…

99. Superposition can be applied to a ckt with initial
conditions/non-linear ckt/…

100. Kelvin’s double bridge is used for the measurement
of…

101. Which of these is not an active transducer
thermocouple/solar cell/RTD/none of these.

102. Oscillator using positive feedback has gain of
0/∞/undefined value/…

103. Wien bridge oscillator should initially have
closed loop gain >3/<3/=3/…

104. Some question on gain margin and phase shift of a
system.

105. Fourier series expansion of even function has sine
terms only/cosine terms only/no odd harmonics/…

106. Full wave rectifier gives clean dc o/p/dc o/p with
small ripple/positive half and inverted negative half of i/p as o/p.

107. Which of these values of ζ gives damped
oscillations: 0/1/1.6/0.6

108. For a transformer of ratio 1:a and excited by a
source V with impedances Z1 and Z2 on the primary and secondary side value of a
for maxm power transfer should be..

109. Fourier transform of cos(ω0t) is…

110. At t=0 the step response of a 1st order system
is….

111. 555 can be used as a monostable/astable/freq
dividing ckt/all of these.

112. In a PT when the secondary is open ckted with the
primary excited what will happen.

113. If a system is marginally stable then the nature
of oscillations will be…

114. Linear encoders mostly use straight
binary/BCD/gray code.

115. For an accelerometer working in displacement mode
the ratio of forcing freq to natural freq should be…..

__Aptitude Paper (70 Questions):__
Most of the Aptitude questions we get straightforward.
This Paper contains questions involving profit and loss, ratio-proportion, DI
from pie-charts, one RC passage and other questions from verbal. Here we have
to concern the Verbal questions, which will be quite confusing, as none of the
options seemed to fit the question.

**For other info, you are required to check the given below link:-**

Take a Look on Below Table

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