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