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