Instrumentation Quiz | 100 MCQ |1000 Student live Instrumentation quiz for Competition exam like-bpcl, iocl, railway je, sail etc. Welcome to TheInstrumentGuru.com Thanks for choosing self assessment Quiz. Check Your Ability in given 100 Questions. Result will show after submission of quiz. DATE:-January 11, 2026 1. For open control system which of the following statements is incorrect ? Recalibration is not required for maintaining the required quality of the output Construction is simple and maintenance easy Less expensive Errors are caused by disturbances 2. All causal systems must have the component of linearity stability time invariance memory 3. Which crop is sown on the largest area in India? Rice Sugarcane Wheat Maize 4. For attenuation of high frequencies we should use shunt capacitance series capacitance inductance resistance 5. For a low level AM system, the amplifiers modulated stage must be harmonic devices linear devices non-linear devices class C amplifiers 6. If the cosine of angle θ is equal to 0.5, and the length of the opposite side is 20 meters, calculate the length of the hypotenuse. 17.32 meters 40 meters 23.09 meters 20.01 meters 7. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Zero nal condition Non-zero initial condition Non-zero nal condition Zero initial condition 8. Damped sinusoids are _____ sinusoid signals multiplied by decaying exponentials sinusoid signals multiplied by growing exponentials sinusoid signals divided by growing exponentials sinusoid signals divided by decaying exponentials 9. The resistivity of pure germanium under standard conditionsis about………. 6x104 Ocm 3x106 Ocm 6x10-4 Ocm 60 Ocm 10. Who is known as “The Saint of Gutters”? Anna Hazare Baba Amte None of these Mother Teresa 11. Solve for both x and y in this simultaneous system of equations: x + 3y = −1, 4x−y = 9 x = 1 ; y = 2 x = 2 ; y = -1 x = -2 ; y = 1 x = 2 ; y = 1 12. By which of the following the control action is determined when a man walks along a path ? Brain Legs Eyes Hands 13. Which type of system response to its input represents the zero value of its initial condition? Zero state response Natural response Total response Zero input response 14. A pentavalent impurity has……….Valence electrons 3 4 6 5 15. An n-type semiconductor is……… Positively charged None of the above Electrically neutral Negatively charged 16. A hole and electron in close proximity would tend to ………. Have no effect on each other None of the above Attract each other Repel each other 17. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 1 atom for 100 atoms 10 atoms for 108 atoms 1 atom for 108 atoms 1 atom for 104 atoms 18. A closed loop system is distinguished from open loop system by which of the following ? Output pattern Feedback Input pattern Servo mechanism 19. Addition of trivalent impurity to a semiconductor creates many…….. Valence electrons Bound electrons Free electrons Holes 20. Convert an angle of 75 degrees into radians: 1.178 radians 0.7854 radians 1.309 radians 1.571 radians 21. Duality Theorem / Property of Fourier Transform states that _________ Shape of signal in time domain & shape of spectrum can never be interchangeable Shape of signal in time domain & shape of spectrum can be interchangeable Shape of signal in frequency domain & shape of spectrum can be interchangeable 22. A signal g(t) = A then g(t) is a neither energy nor power signal insucient data power signal energy signal 23. The strength of a semiconductor crystal comes from …….. Forces between nuclei None of the above Electron-pair bonds Forces between protons 24. Calculate 27% of 340. 12.6 81.0 91.8 88.8 25. Reactance bipolar transistor the radiation is maximum in all directions the radiation at right angles is zero the radiation at right angles is zero the radiation is zero in all directions 26. A car is running at a constant speed of 50 km/h, which of the following is the feedback element for the driver ? Needle of the speedometer Clutch Eyes Steering wheel 27. Under which conditions does an initially relaxed system become unstable ? only if bounded input generates unbounded output only if unbounded input generates bounded output only if unbounded input generates unbounded output only if bounded input generates bounded output 28. The initial response when tne output is not equal to input is called Dynamic response Either of the above Transient response Error response 29. As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes multiplication by e-sT in the s domain division by s in the s domain multiplication by s in the s domain division by e-sT in the s domain 30. Any externally introduced signal affecting the controlled output is called a stimulus gain control signal feedback 31. A control system working under unknown random actions is called stochastic control system digital data system adaptive control system computer control system 32. A semiconductor has………… temperature coefficient of resistance. Negative Zero None of the above Positive 33. A trivalent impurity has…..valence electrons 3 5 6 4 34. Which of the following statements is not necessarily correct for open control system ? Generally free from problems of non-linearities Input command is the sole factor responsible for providing the control action Less expensive Presence of non-linearities causes malfunctioning 35. The frequency range of 300 kHz to 3000 kHz is known as high frequency low frequency medium frequency very high frequency 36. In a semiconductor,current conduction is due to …….. Only holes Only free electrons None of the above Holes and free electrons 37. Circular polarization is useful in reducing depolarization effect on received wave is useful in discrimination between reception of adjacent beams none of the above involves critical alignment of transmitting and receiving antenna 38. Which of the following should be done to make an unstable system stable ? The gain of the system should be increased The number of poles to the loop transfer function should be increased The number of zeros to the loop transfer function should be increased The gain of the system should be decreased 39. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Frequency Shifting Time Reversal Conjugation Time Shifting 40. Which property of fourier transform gives rise to an additional phase shift of -2? ftd for the generated time delay in the communication Time Scaling Duality Linearity Time Shifting 41. The resistivity of a pure silicon is about…………… 100Ocm 3x105Om 6x10-8Ocm 6000Ocm 42. The random motion of holes and free electrons due to thermal agitation is called ………. None of the above Ionisation Pressure Diffusion 43. A hole in a semiconductor is defined as……………. The incomplete part of an electron pair bond A free proton free neutron A free electron 44. A system is said to be dened as non causal, when the output at the present depends on the input at a time instant in the future the output at the present depends on the input at the current time the output at the present does not depend on the factor of time at all the output at the present depends on the input at an earlier time 45. A woofer should be fed from the input through a low pass filter band pass filter high pass filter band stop filter 46. In an open loop control system None of the above Output is dependent on control input Only system parameters have effect on the control output Output is independent of control input 47. A good control system has all the following features except good stability sufficient power handling capacity good accuracy good stability 48. Name the person who was also known as Deshbandhu. S. Radhakrishnan Chittaranjan Das G.K. Gokhale Madan Mohan Malviya 49. In open loop system the control action depends on the input signal the control action depends on the size of the system the control action depends on system variables the control action is independent of the output 50. The colour of an object is decided by reflected colour for opaque object and wavelength transmitted through it for transparent objects the reflected colour none of the above the wavelength transmitted through it 51. A semiconductor has generally……………… valence electrons. 6 2 4 3 52. A modem is classified as low speed if data rate handled is upto 600 bps upto 100 bps upto 400 bps upto 250 bps 53. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 102.3 70.2 80.9 113 54. In closed loop control system, with positive value of feedback gain the overall gain of the system will increase decrease any of the above be unaffected 55. Grand Central Terminal, Park Avenue, New York is the world’s largest railway station None of the above highest railway station longest railway station 56. Which of the following does not cause losses in optical fiber cables? Impurities Attenuation in glass Micro bending Stepped index operation 57. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Trapezoidal Rectangular Semi-circular Triangular 58. A semiconductor is formed by……… bonds. Electrovalent Co-ordinate Covalent None of the above 59. Double integration of a unit step function would lead to a parabola a doublet a ramp an impulse 60. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Australia Africa Europe Asia 61. Manipulate the following equation to solve for x: a = √bx2 x = a2/b x =(a/b) 2 x = √ab x = a/√b 62. FFC stands for forest film company None of the above Foreign Finance Corporation Film Finance Corporation 63. Complex numbers are used in AC circuit analysis primarily to represent: Power Bandwidth and harmonic content Frequency Amplitude and phase shift 64. Which of the following devices are commonly used as error detectors in instruments ? Vernistats Resolvers Any of the above Microsyns 65. Which of the following national parks is not listed in a UNESCO World Heritage site? Sundarbans Kaziranga Kanha Keoladeo 66. The signal dened by the equations f(t) = 0 for t < 0, f(t) = E for 0 ? t ? a and f(t) = 0 for t > a is unit step function a step function a shifted step function originating at t = a a pulse function 67. A time invariant system is a system whose output vanishes with a delay in input remains same with a delay in input decreases with a delay in input increases with a delay in input 68. .... is a part of the human temperature control system. Leg movement Perspiration system Ear Digestive system 69. An automatic toaster is a ______ loop control system. open partially closed closed any of the above 70. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. Increases Remains the same None of theabove Decreases 71. In Pulse Code Modulation system large bandwidth is required quantising noise can be overcome by companding quantising noise can be reduced by decreasing the number of standard levels suffers from the disadvantage of its incompatibly with TDM 72. Which of the following is an open loop control system ? Ward leonard control Metadyne Field controlled D.C. motor Stroboscope 73. .... is a closed loop system. Direct current generator Electric switch Auto-pilot for an aircraft Car starter 74. The Fourier series of an odd periodic function contains odd harmonics only sine harmonics only even harmonics only cosine harmonics only 75. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Shifting Operation Multiplication Operation Integration Operation Folding Operation 76. Which of the following ratios is equivalent to the ratio 25:300 ? 15:4 1:12 17:5 15:1 77. A control system in which the control action is somehow dependent on the output is known as Open system Semi closed loop system Closed loop system None of the above 78. The sine function is defined as ratio of side lengths, Opposite divided by hypotenuse Hypotenuse divided by adjacent Opposite divided by adjacent Adjacent divided by hypotenuse 79. Manipulate the following equation to solve for x: x = y/ab x = a/by x = ay/b x = aby 80. Addition of pentavalent impurity to a semiconductor creates many…….. Free electrons Bound electrons Valence electrons Holes 81. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & aperiodic Continuous & periodic Discrete & periodic Continuous & periodic 82. Factor the following polynomial expression: x2 −x−12 (x + 1)(x−12) (x + 2)(x−6) (x + 4)(x−3) (x + 3)(x−4) 83. Themost commonlyused semiconductoris……….. Silicon Germanium Sulphur Carbon 84. When a pentavalent impurity is added to a pure semiconductor,it becomes…… An insulator p-type semiconductor An intrinsic semiconductor n-type semiconductor 85. For telegraphy the most commonly used modulation system is two tone modulation single tone modulation FSK PCM 86. When a pure semiconductor is heated,its resistance ………….. Can’t say Goes up Goes down Remains the same 87. Which of the following statements is correct? All lens have negative focal power Convex lens has positive focal power and concave lens have negative focal power All lens have positive focal power Convex lens has negative focal power and concave lens have positive focal power 88. VSB modulation is preferred in TV because it avoids phase distortion at low frequencies none of the above it reduces the bandwidth requirement to half it results in better reception 89. Positive logic in a logic circuit is one in which logic 0 voltage level is higher than logic 1 voltage level logic0 and 1 are represented by 0and positive voltage respectively logicvoltage level is lower than logic1 voltage level logic0 and,-1 are represented by negative and positive voltages respectively 90. Commercial Frequency deviation of FM is 80 kHz 70 kHz 65 kHz 75 kHz 91. To eliminate ghosts in the picture twist the transmission line change the antenna orientation of location connect a booster use a longer transmission line 92. Has tendency to oscillate. Open loop system Both (a) and (b) Closed loop system Neither (a) nor (b) 93. Which of the following personalities gave ‘The Laws of Heredity’? G.J. Mendel William Harvey Robert Hook Charles Darwin 94. A system which is linear is said to obey the rules of additivity both scaling and additivity scaling homogeneity 95. Which of the following is an indirect way of generating FM? Reactance bipolar transistor Armstrong modulator Varactor diode modulator Reactance FET modulator 96. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 2 1 3 -3 97. In Modulation, “carrier” is voltage for which frequency, phase or amplitude is varied resultant wave speech voltage to be transmitted voltage with constant frequency, phase or amplitude 98. Garampani sanctuary is located at Kohima, Nagaland Diphu, Assam Gangtok, Sikkim Junagarh, Gujarat 99. Which among the following belongs to the category of non-recursive systems? Causal IIR Systems Causal FIR Systems Non-causal FIR Systems Non-causal IIR Systems 100. A cordless telephone using separate frequencies for transmission in base and portable units is known as half duplex arrangement neither (a) nor (b) duplex arrangement either (a) or (b) Time's up
