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:-March 6, 2026 1. .... is a closed loop system. Direct current generator Auto-pilot for an aircraft Electric switch Car starter 2. A closed loop system is distinguished from open loop system by which of the following ? Input pattern Feedback Servo mechanism Output pattern 3. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 1 atom for 108 atoms 1 atom for 100 atoms 10 atoms for 108 atoms 1 atom for 104 atoms 4. A semiconductor has………… temperature coefficient of resistance. Positive Negative None of the above Zero 5. For a low level AM system, the amplifiers modulated stage must be linear devices class C amplifiers non-linear devices harmonic devices 6. Manipulate the following equation to solve for x: a = √bx2 x = √ab x = a2/b x = a/√b x =(a/b) 2 7. 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 an earlier time the output at the present depends on the input at the current time 8. Which of the following personalities gave ‘The Laws of Heredity’? Charles Darwin G.J. Mendel William Harvey Robert Hook 9. A pentavalent impurity has……….Valence electrons 3 6 4 5 10. A modem is classified as low speed if data rate handled is upto 600 bps upto 250 bps upto 400 bps upto 100 bps 11. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Semi-circular Rectangular Trapezoidal Triangular 12. A signal g(t) = A then g(t) is a power signal insucient data energy signal neither energy nor power signal 13. Damped sinusoids are _____ sinusoid signals multiplied by decaying exponentials sinusoid signals divided by decaying exponentials sinusoid signals divided by growing exponentials sinusoid signals multiplied by growing exponentials 14. Manipulate the following equation to solve for x: x = aby x = ay/b x = a/by x = y/ab 15. A woofer should be fed from the input through a high pass filter band pass filter low pass filter band stop filter 16. Any externally introduced signal affecting the controlled output is called a signal stimulus gain control feedback 17. The initial response when tne output is not equal to input is called Transient response Dynamic response Either of the above Error response 18. Factor the following polynomial expression: x2 −x−12 (x + 3)(x−4) (x + 4)(x−3) (x + 2)(x−6) (x + 1)(x−12) 19. In Modulation, “carrier” is voltage for which frequency, phase or amplitude is varied resultant wave voltage with constant frequency, phase or amplitude speech voltage to be transmitted 20. An automatic toaster is a ______ loop control system. any of the above open closed partially closed 21. A hole in a semiconductor is defined as……………. The incomplete part of an electron pair bond free neutron A free proton A free electron 22. 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 step function a shifted step function originating at t = a a pulse function 23. The sine function is defined as ratio of side lengths, Opposite divided by adjacent Opposite divided by hypotenuse Hypotenuse divided by adjacent Adjacent divided by hypotenuse 24. The Fourier series of an odd periodic function contains sine harmonics only even harmonics only cosine harmonics only odd harmonics only 25. When a pentavalent impurity is added to a pure semiconductor,it becomes…… p-type semiconductor An insulator n-type semiconductor An intrinsic semiconductor 26. A time invariant system is a system whose output vanishes with a delay in input increases with a delay in input remains same with a delay in input decreases with a delay in input 27. A control system in which the control action is somehow dependent on the output is known as Open system Semi closed loop system None of the above Closed loop system 28. To eliminate ghosts in the picture twist the transmission line change the antenna orientation of location connect a booster use a longer transmission line 29. Which of the following does not cause losses in optical fiber cables? Impurities Micro bending Attenuation in glass Stepped index operation 30. 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 31. Which of the following national parks is not listed in a UNESCO World Heritage site? Kanha Keoladeo Sundarbans Kaziranga 32. All causal systems must have the component of time invariance stability memory linearity 33. A control system working under unknown random actions is called digital data system stochastic control system adaptive control system computer control system 34. 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 the input signal the control action depends on system variables 35. .... is a part of the human temperature control system. Perspiration system Leg movement Digestive system Ear 36. Which of the following ratios is equivalent to the ratio 25:300 ? 1:12 15:1 17:5 15:4 37. The resistivity of pure germanium under standard conditionsis about………. 3x106 Ocm 60 Ocm 6x10-4 Ocm 6x104 Ocm 38. Addition of pentavalent impurity to a semiconductor creates many…….. Valence electrons Holes Free electrons Bound electrons 39. In closed loop control system, with positive value of feedback gain the overall gain of the system will increase be unaffected any of the above decrease 40. Commercial Frequency deviation of FM is 70 kHz 65 kHz 75 kHz 80 kHz 41. Circular polarization none of the above is useful in discrimination between reception of adjacent beams is useful in reducing depolarization effect on received wave involves critical alignment of transmitting and receiving antenna 42. VSB modulation is preferred in TV because none of the above it results in better reception it avoids phase distortion at low frequencies it reduces the bandwidth requirement to half 43. A trivalent impurity has…..valence electrons 3 4 6 5 44. Which of the following devices are commonly used as error detectors in instruments ? Vernistats Resolvers Any of the above Microsyns 45. The strength of a semiconductor crystal comes from …….. Forces between protons None of the above Forces between nuclei Electron-pair bonds 46. A system which is linear is said to obey the rules of additivity both scaling and additivity scaling homogeneity 47. By which of the following the control action is determined when a man walks along a path ? Eyes Legs Brain Hands 48. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Asia Australia Europe Africa 49. 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 50. 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 Generally free from problems of non-linearities Less expensive Presence of non-linearities causes malfunctioning 51. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 70.2 102.3 113 80.9 52. A hole and electron in close proximity would tend to ………. Have no effect on each other None of the above Repel each other Attract each other 53. In a semiconductor,current conduction is due to …….. Only holes Only free electrons None of the above Holes and free electrons 54. In Pulse Code Modulation system quantising noise can be reduced by decreasing the number of standard levels quantising noise can be overcome by companding large bandwidth is required suffers from the disadvantage of its incompatibly with TDM 55. The resistivity of a pure silicon is about…………… 100Ocm 3x105Om 6000Ocm 6x10-8Ocm 56. 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 57. The frequency range of 300 kHz to 3000 kHz is known as high frequency low frequency very high frequency medium frequency 58. 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 the reflected colour none of the above 59. Which of the following should be done to make an unstable system stable ? The gain of the system should be decreased 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 60. Convert an angle of 75 degrees into radians: 1.571 radians 1.309 radians 1.178 radians 0.7854 radians 61. In an open loop control system Output is dependent on control input Output is independent of control input Only system parameters have effect on the control output None of the above 62. 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 63. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Time Shifting Time Reversal Conjugation Frequency Shifting 64. For attenuation of high frequencies we should use shunt capacitance resistance inductance series capacitance 65. Reactance bipolar transistor the radiation at right angles is zero the radiation is zero in all directions the radiation at right angles is zero the radiation is maximum in all directions 66. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & periodic Continuous & periodic Continuous & aperiodic Discrete & periodic 67. 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 time domain & shape of spectrum can be interchangeable Shape of signal in frequency domain & shape of spectrum can be interchangeable 68. Grand Central Terminal, Park Avenue, New York is the world’s longest railway station highest railway station None of the above largest railway station 69. FFC stands for Foreign Finance Corporation None of the above Film Finance Corporation forest film company 70. Who is known as “The Saint of Gutters”? Baba Amte Anna Hazare None of these Mother Teresa 71. A good control system has all the following features except good accuracy good stability sufficient power handling capacity good stability 72. Which crop is sown on the largest area in India? Maize Wheat Sugarcane Rice 73. Which of the following is an indirect way of generating FM? Armstrong modulator Varactor diode modulator Reactance bipolar transistor Reactance FET modulator 74. When a pure semiconductor is heated,its resistance ………….. Goes up Can’t say Remains the same Goes down 75. Calculate 27% of 340. 12.6 91.8 81.0 88.8 76. Which among the following belongs to the category of non-recursive systems? Non-causal FIR Systems Causal FIR Systems Causal IIR Systems Non-causal IIR Systems 77. A cordless telephone using separate frequencies for transmission in base and portable units is known as half duplex arrangement duplex arrangement either (a) or (b) neither (a) nor (b) 78. An n-type semiconductor is……… Positively charged Negatively charged Electrically neutral None of the above 79. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. Decreases None of theabove Increases Remains the same 80. Name the person who was also known as Deshbandhu. Chittaranjan Das G.K. Gokhale S. Radhakrishnan Madan Mohan Malviya 81. For telegraphy the most commonly used modulation system is two tone modulation FSK PCM single tone modulation 82. Has tendency to oscillate. Neither (a) nor (b) Closed loop system Open loop system Both (a) and (b) 83. A semiconductor has generally……………… valence electrons. 4 6 2 3 84. Addition of trivalent impurity to a semiconductor creates many…….. Valence electrons Free electrons Holes Bound electrons 85. Which type of system response to its input represents the zero value of its initial condition? Zero input response Zero state response Total response Natural response 86. 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 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 Shifting Duality Time Scaling Linearity 88. Themost commonlyused semiconductoris……….. Germanium Carbon Sulphur Silicon 89. A semiconductor is formed by……… bonds. Electrovalent Co-ordinate None of the above Covalent 90. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 2 3 -3 1 91. 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 92. 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. 40 meters 17.32 meters 20.01 meters 23.09 meters 93. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Folding Operation Integration Operation Multiplication Operation Shifting Operation 94. Double integration of a unit step function would lead to a ramp an impulse a parabola a doublet 95. Under which conditions does an initially relaxed system become unstable ? only if bounded input generates unbounded output only if bounded input generates bounded output only if unbounded input generates unbounded output only if unbounded input generates bounded output 96. Complex numbers are used in AC circuit analysis primarily to represent: Bandwidth and harmonic content Amplitude and phase shift Power Frequency 97. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Zero initial condition Non-zero initial condition Zero nal condition Non-zero nal condition 98. The random motion of holes and free electrons due to thermal agitation is called ………. None of the above Ionisation Pressure Diffusion 99. Garampani sanctuary is located at Junagarh, Gujarat Diphu, Assam Gangtok, Sikkim Kohima, Nagaland 100. Which of the following is an open loop control system ? Field controlled D.C. motor Stroboscope Ward leonard control Metadyne Time's up
