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  #2  
20th November 2014, 09:13 AM
Super Moderator
 
Join Date: Apr 2013
Re: NPCIL Instrumentation Question Papers

As you need the question paper of NPCIL Instrumentation so here it is given below

(1) Instrument is a device for determining

(a) the magnitude of a quantity

(b) the physics of a variable

(c) either of the above

(d) both (a) and (b)

(2) Electronic instruments are preferred because they have

(a) no indicating part

(b) low resistance in parallel circuit

(c) very fast response

(d) high resistance in series circuit

(e) no passive elements.

(3) A DC wattmeter essentially consist of

(a) two ammeters

(b) two voltmeters

(c) a voltmeter and an ammeter

(d) a current and potential transformer

(4) Decibel is a unit of

(a) power

(b) impedance

(c) frequency

(d) power ratio

(5) A dc voltmeter may be used directly to measure

(a) frequency

(b) polarity

(c) power factor

(d)power

(6) An accurate voltmeter must have an internal impedance of

(a) very low value

(b) low value

(c) medium value

(d) very high value

(7) The insulation resistance of a transformer winding can be easily measured with

(a) Wheatstone bridge

(b) megger

(c) Kelvin bridge

(d) voltmeter

(8) A 100 V voltmeter has full-scale accuracy of 5%. At its reading of 50 V it will give an error of

(a) 10%

(b) 5%

(c) 2.5%

(d) 1.25%

(9) You are required to check the p. f. of an electric load. No p.f. meter is available. You would use:

(a) a wattmeter

(b) a ammeter, a voltmeter and a wattmeter

(c) a voltmeter and a ammeter

(d) a kWh meter

(10) The resistance of a field coil may be correctly measured by using

(a) a voltmeter and an ammeter

(b) Schering bridge

(c) a Kelvin double bridge

(d) a Maxwell bridge

(11) An analog instrument has output

(a) Pulsating in nature

(b) Sinusoidal in nature

(c) Which is continuous function of time and bears a constant relation to its input

(d) Independent of the input quantity

(12) Basic charge measuring instrument is

(a) Duddel’s oscillograph

(b) Cathode ray oscillograph

(c) Vibration Galvanometer

(d) Bailastic Galvanometer

(e) Battery Charging equipment

(13) A.C. voltage can be measured (using a d.c. instrument) as a value obtained

(a) by subtracting the d.c. reading from it’s a.c. reading.

(b) Using the output function of the multimeter

(c) By using a suitable inductor in series with it

(d) By using a parallel capacitor with it

(e) None of the above

(14) A moving coil permanent magnet ammeter can be used to measure

(a) D. C. current only

(b) A. C. current only

(c) A. C. and D. C. currents

(d) voltage by incorporating a shunt resistance

(e) none of these

(15) Select the wrong statement

(a) the internal resistance of the voltmeter must be high

(b) the internal resistance of ammeter must be low

(c) the poor overload capacity is the main disadvantage of hot wires instrument

(d) the check continuity with multimeter, the highest range should be used.

(e) In moving iron voltmeter, frequency compensation is achieved by connecting a capacitor across its fixed coil.

(16) Which of the following instrument is suitable for measuring both a.c. and d.c.

quantities.

(a) permanent magnet moving coil ammeter.

(b) Induction type ammeter.

(c) Quadrant electrometer.

(d) Moving iron repulsion type ammeter.

(e) Moving iron attraction type voltmeter.

(17) Swamping resistance is used in moving coil instruments to reduce error due to

(a) thermal EMF

(b) temperature

(c) power taken by the instrument

(d) galvanometer sensitivity.

(18) A power factor meter is based on the principle of

(a) electrostatic instrument

(b) Electrodynamometer instrument

(c) Electro thermo type instrument

(d) Rectifier type instrument.

(19) A potentiometer recorder is used for

(a) AC singles

(b) DC signals

(c) both (a) and (b)

(d) time varying signals

(e) none of these.

(20) Transformers used in conjunction with measuring instruments for measuring purposes are called

(a) Measuring transformers

(b) transformer meters

(c) power transformers

(d) instrument transformers

(e) pulse transformers.

(21) Leakage flux in an electrical machine is measure by

(a) Ballistic galvanometer

(b) Flux meter

(c) Either (a) or (b)

(d) Vibration galvanometer

(e) CRO

(22) A C.R.O. is used to indicate

(a) supply waveform

(b) magnitude of the applied voltage

(c) B.H. loop

(d) all of these

(e) Magnitude of the current flowing in it.

(23) An oscillator is a

(a) an amplifier having feedback network

(b) a high gain amplifier

(c) a wide band amplifier

(d) a untuned amplifier

(e) None of these

(24) Distortion can be measured by

(a) Wave meter

(b) Digital filters

(c) Wein bridge circuit

(d) Bridge T filter circuit

(25) Series connected Q- meter is preferable for measurement of components having

(a) high impedance

(b) low impedance

(c) both (a) and (b)

(d) high frequency

(e) low capacitance

(26) A potentiometer is

(a) an active transducer

(b) a passive transducer

(c) a secondary transducer

(d) a digital transducer

(e) a current sensing transducer

(27) The basic components of a digital voltmeter are:

(a) A/D converter and a counter

(b) A/D converted and a rectifier

(c) D/A converter and a counter

(d) Ramp generator and counter

(e) Comparator

(28) Which of the following electrical equipment cannot convert ac into dc

(a) diode

(b) converter

(c) transformer

(d) mercury arc rectifier

(29) Voltage measurement are often taken by using either a voltmeter or

(a) an ammeter

(b) an ohmmeter

(c) an oscillator

(d) a watt-meter

(30)The electric device which blocks DC but allows AC is called:

(a) capacitance

(b) inductor

(c) an oscilloscope

(d) a watt-meter

(31 ) The range of an ammeter can be extended by using a

(a) shunt in series

(b) shunt in parallel

(c) multiplier in series

(d) multiplier in parallel

(32)A device that changes one form of energy to another is called

(a) rheostat

(b) oscillator

(c) transducer

(d) varicap

(33) Aquadag is used in CRO to collect

(a) primary electron

(b) secondary electron

(c) both primary and secondary

(d) none of above

(34) A vertical amplifier for CRO can be designed for

(a) only a high gain

(b) only a broad bandwidth

(c) a constant gain time bandwidth product

(d)all of the above

(35) One of the following is active transducer

(a) Strain gauge

(b) Selsyn

(c) Photovoltic cell

(d) Photo emissive cell

(36) The dynamic characteristics of capacitive transducer are similar to those of

(a) low pass filter

(b) high pass filter

(c) band pass filter

(d) band stop filter

(37) Thermocouples are

(a) passive transducers

(b) active transducers

(c) both active and passive transducers

(d) output transducers

(38) The size of air cored transducers as compare to iron core counter part are

(a) bigger

(b) smaller

(c) same

(39) From the point of view of safety, the resistance of earthing electrode should be:

(a) low

(b) high

(c) medium

(d) the value of resistance of electrode does not effect the safety

(40) In CRT the focusing anode is located

(a) between pre accelerating and accelerating anodes

(b) after accelerating anodes

(c) before pre accelerating anodes

(d) none of above

(41) Which transducer converts heat energy into electrical energy

(a) I. V. D. T.

(b) thermocouple

(c) photoconductor

(d) none of the above

(42) Which of photoelectric transducer is used for production of electric energy by converting solar energy

(a) photo emission cell

(b) photo diode

(c) photo transistor

(d) both (b) and (c)

(43) Which of the following instruments consumes maximum power during measurement?

(a) induction instruments

(b) hot wire instruments

(c) thermocouple instruments

(d) electrodynamometer instruments

(44) Which of the following meters has the best accurancy

(a) moving iron meter

(b) moving coil meter

(c) rectifier type meter

(d) thermocouple meter

(45) The function of the safety resistor in ohm meter is to

(a) limit the current in the coil

(b) increase the voltage drop across the coil

(c) increase the current in the coil

(d) protect the battery

(46) Which of the following instruments is free from hysteresis and eddy current losses?

(a) M.l. instrument

(b) electrostatic instrument

(c) electrodynamometer type instrument

(d)all of these

(47) The dielectric loss of a capacitance can be measured by

(a) Wien bridge

(b) Owen bridge

(c) Schering bridge

(d) Maxwell bridge

(48) Reed frequency meter is essentially a

(a) recording system

(b) deflection measuring system

(c) vibration measuring system

(d) oscillatory measuring system

(49) In measurements made using a Q meter, high impedance elements should preferably be connected in

(a) star

(b) delta

(c) series

(d) parallel

(50) A digital voltmeter measures

(a) peak value

(b) peak-to-peak value

(c) rms value

(d) average value
  #3  
20th March 2015, 11:40 AM
Unregistered
Guest
 
Re: NPCIL Instrumentation Question Papers

Hi I want the placement paper of Nuclear Power Corporation of India Ltd. (NPCIL) NPCIL so will you please provide me?
  #4  
20th March 2015, 11:41 AM
Super Moderator
 
Join Date: May 2012
Re: NPCIL Instrumentation Question Papers

Ok, as you want the placement paper of Nuclear Power Corporation of India Ltd. (NPCIL) NPCIL so here I am providing you.

NPCIL Placement Paper

1.If sampling frequency doubles then
a) Quantization noise decreases
b) Quantization density decreases
c) Quantization noise increases
d) Quantization density increases

2. Two signals of 2GHz and 4GHz are frequency modulated on same carrier 10 GHz. Find the ratio of
frequency deviation if band widths of both are equal.
a) 1:2 b)2:1 c) 1:1 d) 1:4

3. Gray code of 111 is

4. 3X512+7X64+5X8+3 then value in binary form contains _______ number of 1’s.
a) 7 b) 6 c) 9 d) none

5. The 2’s compliment of decimal number 19 in 8-bit system is
a) 11101101

6) The high gain codes are
a) Turbo codes b) BCH codes c) R-S codes

7) BCH codes are of the type________
a) Convolutional type b) c)

8) Time constant of LC circuit is
a) L/R b) L/R2 c) RL

9) If R is doubled and C is halved then frequency of series RLC circuit is

10) The solution for the equation (D2+4) y=sin2x is

11) Laplace Tramsform of sin3x is

12) The Z-transform for the series is
X [n] = { 7; n= -1
{5 n=0
{ 1 n=1
{0 else

13) The magic Tee is a
a) 4 port tee b) c)

14) The register which holds the address of the next instruction is
a) Program counter b) c)

15) The antenna gain is given by……………?

16) The satellite is in 630km orbit and transmitting at a frequency 5 MHz, when satellite is on your head the Doppler shift is——–
a) b) c) 0 d)

17) The impedance of a lossless transmission line is
a) √(L/C)

18) A 50Ώline with load impedance 100Ώ the VSWR is

19) In a waveguide measurement, the forward power is 10mW, the reverse power is 1mW then VSWR is _____________

20) Transmitted power is 100W, gain of the transmitter antenna is 30 dB and the path loss is 50 dB then received power is

21) When transmitted power is 100mW and the path loss 100 dBm then received power is
a) -80 dBm

22) When a em wave is incident normally on a perfect conductor then
a) Totally reflected b) partially reflected
c) Totally transmitted d) none.

23) Zsc =100Ώ Zoc =1Ώ then Zo is
a) 1Ώ b) 10Ώ c)___d)__

24) When the operating wavelength of line is λ/4<λ<λ/2, the impedance is
a) Capacitive b) inductive c) ____ D) none

25) The value of L if source is 50V AC of 10 KHz frequency and current is 7.96 A.
a) ____

26) The resonant frequency is 50MHz bandwidth 100 KHz then Q factor is
a) ______ b)_______ c)…..

27)The Q factor of a series RLC circuit is
a)……b)……

28) Q value of a parallel RLC circuit is ________
a)……b)….

29) If the lines x+y+3=0, x-2y+7=0, 2x+ky+5=0 are required to be concurrent then the value of k is___ a) ___ b)…..

30) The vectors i-2j+k, 2i+3j-k,R are the complete, then r is given by ______

31) If a satellite revolving with angular velocity w and the velocity is v then
Curl v is _______
a) w b) 2w c) w 2 d) …..

32) If each stage amplifier contains 10dB gain the figure of merit of 2-stages is
Given by ……

33) The maximum rate possible in kbps if F=15 and bandwidth is 4 KHz is…….

34) The maximum time allowed for each flip flop for a ripple counter of mod-1024 , if clock given to it is 1MHz is ……..

35) The maximum time allowed time for each flip flop for a mod 10 synchronous counter if each flip flop delay is 25ns.
a) 25 ns b) 50 ns c) 100 ns d) none

36) The high speed for CML gate is due to operating it in ——— region.
a) non saturation

37)In a micro processor the wait states are inserted to
a) make the processor to wait during DMA operation
b) make the processor to wait during an interrupt processing
c) make the processor wait during a power shutdown.
d) interface the slow peripherals to the processor.

38) In a digital voltmeter the ADC’s used are of type
1. successive 2.flash type 3. Dual slope
in ascending order of time is
1. a) 2,1,3 b) 1,2,3 c) 3,1,2 d) none

39) The number of NAND gates are required to implement AӨB (XOR), assuming compliments not available ………….

40) The resolution for a DAC is given by 0.4% then no. of bits of DAC is
a) 8- bits

41) The chip capacity is 256 bits, then the no.of chips required to build 1024 B memory
Is……….
1. a) 32 b) 16 c) 15)

42) Which of the following are correct?
1. A flip-flop is used to store 1-bit of information
2. Race around condition occurs in JK flip flop when both the inputs are 1
3. Master slave flip flop is used to store 2 bits of information
4. A transparent latch consists of a D- flip flop
a) 1, 2,3 b) 1,3,4 (ANS) c)1,2,4 d) 2,3,4

43) The bit rate of a QPSK compared to BPSK is
a)half b) double c) same

44) There are 5 red balls and 5 black balls in a box. The probability to select 2 balls one after other without reputting is,
a) 2/9 b) 1/90 c) 11/90 d) none

45) The rms voltage is obtained by multiplying peak by a factor
a) 1/√2

46) H(s)=S/(S+a) is a transfer function of ______
a) LPF b) Notch c) BPF d) HPF

47) Resistance of a 2 parallel resistors is 12Ώ and the effective resistance when one resistor broke is 18Ώ then the value of resistance in another is_________

48)The output of a phase modulator when input applied is integrating signal is
a)FM b) AM c) PM d) none

49) For a transformer the losses which vary with load are
a) core losses b) copper losses c) Hysterises losses d) none.

50) The waves which cannot be transmitted in waveguide are
a) TE b) TEM c) TM d) none

51) Diplexer is a
a) circulator only b)only transmitter filter c) only receiver filter
d) both transmitter and receiver filter

52) δ(t) represents impulse then ∫( δ(t) cos 2t )dt with limits 0 to infinity is
a) 1, b) -1 c) infinity d ) 0

53) ∫1/(x√(x2-a2)) dx is
A)cosec2x


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