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