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