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