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