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:-May 9, 2026 1. Which of the following is an open loop control system ? Field controlled D.C. motor Ward leonard control Metadyne Stroboscope 2. Who is known as “The Saint of Gutters”? Mother Teresa Anna Hazare None of these Baba Amte 3. The resistivity of a pure silicon is about…………… 6x10-8Ocm 100Ocm 6000Ocm 3x105Om 4. 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 5. What is the nature of Fourier representation of a discrete & aperiodic signal? Discrete & periodic Continuous & aperiodic Continuous & periodic Continuous & periodic 6. Addition of pentavalent impurity to a semiconductor creates many…….. Valence electrons Bound electrons Holes Free electrons 7. Has tendency to oscillate. Closed loop system Open loop system Both (a) and (b) Neither (a) nor (b) 8. When a pentavalent impurity is added to a pure semiconductor,it becomes…… An intrinsic semiconductor p-type semiconductor n-type semiconductor An insulator 9. Which of the following devices are commonly used as error detectors in instruments ? Any of the above Vernistats Resolvers Microsyns 10. In closed loop control system, with positive value of feedback gain the overall gain of the system will decrease increase be unaffected any of the above 11. A pentavalent impurity has……….Valence electrons 4 5 3 6 12. Addition of trivalent impurity to a semiconductor creates many…….. Bound electrons Holes Valence electrons Free electrons 13. Under which conditions does an initially relaxed system become unstable ? only if bounded input generates bounded output only if bounded input generates unbounded output only if unbounded input generates bounded output only if unbounded input generates unbounded output 14. The colour of an object is decided by none of the above the reflected colour the wavelength transmitted through it reflected colour for opaque object and wavelength transmitted through it for transparent objects 15. A modem is classified as low speed if data rate handled is upto 250 bps upto 600 bps upto 400 bps upto 100 bps 16. A system which is linear is said to obey the rules of scaling homogeneity additivity both scaling and additivity 17. Garampani sanctuary is located at Gangtok, Sikkim Kohima, Nagaland Junagarh, Gujarat Diphu, Assam 18. A trivalent impurity has…..valence electrons 5 6 4 3 19. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Trapezoidal Semi-circular Triangular Rectangular 20. Which of the following personalities gave ‘The Laws of Heredity’? G.J. Mendel William Harvey Robert Hook Charles Darwin 21. In a semiconductor,current conduction is due to …….. Only holes Only free electrons None of the above Holes and free electrons 22. Manipulate the following equation to solve for x: x = aby x = a/by x = ay/b x = y/ab 23. A control system working under unknown random actions is called computer control system adaptive control system stochastic control system digital data system 24. A hole and electron in close proximity would tend to ………. Attract each other None of the above Repel each other Have no effect on each other 25. Which of the following ratios is equivalent to the ratio 25:300 ? 17:5 15:4 1:12 15:1 26. 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 27. A semiconductor has generally……………… valence electrons. 4 6 3 2 28. Damped sinusoids are _____ sinusoid signals multiplied by growing exponentials sinusoid signals multiplied by decaying exponentials sinusoid signals divided by growing exponentials sinusoid signals divided by decaying exponentials 29. 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 Presence of non-linearities causes malfunctioning Less expensive 30. 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 31. FFC stands for forest film company Film Finance Corporation Foreign Finance Corporation None of the above 32. Convert an angle of 75 degrees into radians: 1.571 radians 0.7854 radians 1.178 radians 1.309 radians 33. The resistivity of pure germanium under standard conditionsis about………. 6x10-4 Ocm 6x104 Ocm 3x106 Ocm 60 Ocm 34. 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 35. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Time Shifting Time Reversal Conjugation Frequency Shifting 36. The strength of a semiconductor crystal comes from …….. Forces between nuclei Forces between protons Electron-pair bonds None of the above 37. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 2 3 1 -3 38. Factor the following polynomial expression: x2 −x−12 (x + 1)(x−12) (x + 2)(x−6) (x + 3)(x−4) (x + 4)(x−3) 39. Which type of system response to its input represents the zero value of its initial condition? Zero state response Zero input response Total response Natural response 40. As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes division by e-sT in the s domain multiplication by e-sT in the s domain multiplication by s in the s domain division by s in the s domain 41. Calculate 27% of 340. 91.8 81.0 88.8 12.6 42. Circular polarization is useful in discrimination between reception of adjacent beams none of the above involves critical alignment of transmitting and receiving antenna is useful in reducing depolarization effect on received wave 43. .... is a closed loop system. Auto-pilot for an aircraft Direct current generator Electric switch Car starter 44. A good control system has all the following features except good accuracy sufficient power handling capacity good stability good stability 45. .... is a part of the human temperature control system. Perspiration system Ear Leg movement Digestive system 46. A semiconductor has………… temperature coefficient of resistance. Negative Positive None of the above Zero 47. Name the person who was also known as Deshbandhu. Chittaranjan Das Madan Mohan Malviya S. Radhakrishnan G.K. Gokhale 48. A hole in a semiconductor is defined as……………. A free electron free neutron A free proton The incomplete part of an electron pair bond 49. For attenuation of high frequencies we should use series capacitance resistance shunt capacitance inductance 50. Double integration of a unit step function would lead to an impulse a doublet a ramp a parabola 51. A woofer should be fed from the input through a high pass filter band stop filter low pass filter band pass filter 52. To eliminate ghosts in the picture use a longer transmission line connect a booster change the antenna orientation of location twist the transmission line 53. When a pure semiconductor is heated,its resistance ………….. Can’t say Goes down Goes up Remains the same 54. A closed loop system is distinguished from open loop system by which of the following ? Input pattern Output pattern Feedback Servo mechanism 55. The sine function is defined as ratio of side lengths, Opposite divided by adjacent Hypotenuse divided by adjacent Opposite divided by hypotenuse Adjacent divided by hypotenuse 56. A control system in which the control action is somehow dependent on the output is known as Semi closed loop system None of the above Open system Closed loop system 57. Grand Central Terminal, Park Avenue, New York is the world’s highest railway station None of the above largest railway station longest railway station 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 17.32 meters 20.01 meters 40 meters 59. Which of the following should be done to make an unstable system stable ? 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 The number of zeros to the loop transfer function should be increased 60. The Fourier series of an odd periodic function contains even harmonics only sine harmonics only cosine harmonics only odd harmonics only 61. Themost commonlyused semiconductoris……….. Sulphur Silicon Carbon Germanium 62. For a low level AM system, the amplifiers modulated stage must be linear devices class C amplifiers non-linear devices harmonic devices 63. In Pulse Code Modulation system suffers from the disadvantage of its incompatibly with TDM quantising noise can be reduced by decreasing the number of standard levels quantising noise can be overcome by companding large bandwidth is required 64. Manipulate the following equation to solve for x: a = √bx2 x = a/√b x =(a/b) 2 x = √ab x = a2/b 65. 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 66. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 1 atom for 104 atoms 1 atom for 100 atoms 1 atom for 108 atoms 10 atoms for 108 atoms 67. VSB modulation is preferred in TV because it avoids phase distortion at low frequencies it results in better reception it reduces the bandwidth requirement to half none of the above 68. A cordless telephone using separate frequencies for transmission in base and portable units is known as duplex arrangement neither (a) nor (b) half duplex arrangement either (a) or (b) 69. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. Remains the same None of theabove Increases Decreases 70. An automatic toaster is a ______ loop control system. partially closed any of the above open closed 71. The frequency range of 300 kHz to 3000 kHz is known as very high frequency high frequency low frequency medium frequency 72. 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 pulse function unit step function a step function a shifted step function originating at t = a 73. Which of the following does not cause losses in optical fiber cables? Stepped index operation Impurities Attenuation in glass Micro bending 74. 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 negative and positive voltages respectively logic0 and 1 are represented by 0and positive voltage respectively 75. Commercial Frequency deviation of FM is 70 kHz 75 kHz 80 kHz 65 kHz 76. Complex numbers are used in AC circuit analysis primarily to represent: Amplitude and phase shift Frequency Bandwidth and harmonic content Power 77. 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 78. A semiconductor is formed by……… bonds. Co-ordinate Electrovalent Covalent None of the above 79. Which of the following national parks is not listed in a UNESCO World Heritage site? Keoladeo Kaziranga Sundarbans Kanha 80. 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 81. In open loop system the control action depends on system variables 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 82. By which of the following the control action is determined when a man walks along a path ? Brain Eyes Hands Legs 83. For telegraphy the most commonly used modulation system is single tone modulation two tone modulation PCM FSK 84. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Non-zero initial condition Non-zero nal condition Zero nal condition Zero initial condition 85. The random motion of holes and free electrons due to thermal agitation is called ………. Pressure Diffusion Ionisation None of the above 86. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Multiplication Operation Shifting Operation Integration Operation Folding Operation 87. 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 88. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 102.3 113 70.2 80.9 89. Which of the following statements is correct? Convex lens has negative focal power and concave lens have positive focal power Convex lens has positive focal power and concave lens have negative focal power All lens have negative focal power All lens have positive focal power 90. A system is said to be dened as non causal, when 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 the output at the present depends on the input at an earlier time 91. An n-type semiconductor is……… None of the above Electrically neutral Positively charged Negatively charged 92. Which of the following is an indirect way of generating FM? Armstrong modulator Reactance bipolar transistor Varactor diode modulator Reactance FET modulator 93. Which crop is sown on the largest area in India? Maize Rice Wheat Sugarcane 94. 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 95. All causal systems must have the component of linearity memory stability time invariance 96. The initial response when tne output is not equal to input is called Error response Either of the above Dynamic response Transient response 97. In an open loop control system Output is independent of control input Only system parameters have effect on the control output Output is dependent on control input None of the above 98. A signal g(t) = A then g(t) is a neither energy nor power signal power signal insucient data energy signal 99. Any externally introduced signal affecting the controlled output is called a gain control signal feedback stimulus 100. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Australia Europe Africa Asia Time's up
