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