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 3, 2023 1. In Pulse Code Modulation system quantising noise can be reduced by decreasing the number of standard levels quantising noise can be overcome by companding suffers from the disadvantage of its incompatibly with TDM large bandwidth is required 2. As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes division by s in the s domain multiplication by e-sT in the s domain division by e-sT in the s domain multiplication by s in the s domain 3. The resistivity of a pure silicon is about…………… 6000Ocm 6x10-8Ocm 3x105Om 100Ocm 4. In closed loop control system, with positive value of feedback gain the overall gain of the system will decrease be unaffected any of the above increase 5. FFC stands for forest film company Film Finance Corporation None of the above Foreign Finance Corporation 6. The frequency range of 300 kHz to 3000 kHz is known as low frequency medium frequency very high frequency high frequency 7. Damped sinusoids are _____ sinusoid signals multiplied by decaying exponentials sinusoid signals divided by decaying exponentials sinusoid signals multiplied by growing exponentials sinusoid signals divided by growing exponentials 8. 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 9. A hole in a semiconductor is defined as……………. A free electron free neutron A free proton The incomplete part of an electron pair bond 10. A modem is classified as low speed if data rate handled is upto 400 bps upto 250 bps upto 100 bps upto 600 bps 11. 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 12. Which of the following is an indirect way of generating FM? Varactor diode modulator Reactance FET modulator Armstrong modulator Reactance bipolar transistor 13. All causal systems must have the component of time invariance stability linearity memory 14. A woofer should be fed from the input through a band stop filter low pass filter high pass filter band pass filter 15. Addition of pentavalent impurity to a semiconductor creates many…….. Valence electrons Holes Free electrons Bound electrons 16. A closed loop system is distinguished from open loop system by which of the following ? Feedback Input pattern Output pattern Servo mechanism 17. Commercial Frequency deviation of FM is 75 kHz 80 kHz 70 kHz 65 kHz 18. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 10 atoms for 108 atoms 1 atom for 108 atoms 1 atom for 100 atoms 1 atom for 104 atoms 19. A pentavalent impurity has……….Valence electrons 5 4 3 6 20. An n-type semiconductor is……… None of the above Positively charged Electrically neutral Negatively charged 21. A control system working under unknown random actions is called stochastic control system computer control system digital data system adaptive control system 22. Which of the following statements is correct? All lens have negative focal power Convex lens has positive focal power and concave lens have negative focal power Convex lens has negative focal power and concave lens have positive focal power All lens have positive focal power 23. For a low level AM system, the amplifiers modulated stage must be harmonic devices linear devices non-linear devices class C amplifiers 24. Double integration of a unit step function would lead to a doublet a parabola an impulse a ramp 25. 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 26. The Fourier series of an odd periodic function contains cosine harmonics only even harmonics only sine harmonics only odd harmonics only 27. Calculate 27% of 340. 12.6 88.8 91.8 81.0 28. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Non-zero nal condition Zero nal condition Zero initial condition Non-zero initial condition 29. Manipulate the following equation to solve for x: a = √bx2 x =(a/b) 2 x = a/√b x = a2/b x = √ab 30. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 3 -3 1 2 31. Garampani sanctuary is located at Gangtok, Sikkim Junagarh, Gujarat Kohima, Nagaland Diphu, Assam 32. When a pentavalent impurity is added to a pure semiconductor,it becomes…… An intrinsic semiconductor n-type semiconductor An insulator p-type semiconductor 33. The sine function is deﬁned as ratio of side lengths, Opposite divided by hypotenuse Adjacent divided by hypotenuse Opposite divided by adjacent Hypotenuse divided by adjacent 34. 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 35. Which of the following ratios is equivalent to the ratio 25:300 ? 1:12 17:5 15:4 15:1 36. 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 37. Any externally introduced signal affecting the controlled output is called a signal stimulus gain control feedback 38. Which of the following does not cause losses in optical fiber cables? Impurities Stepped index operation Micro bending Attenuation in glass 39. The colour of an object is decided by the wavelength transmitted through it none of the above the reflected colour reflected colour for opaque object and wavelength transmitted through it for transparent objects 40. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Europe Asia Africa Australia 41. Which of the following is an open loop control system ? Field controlled D.C. motor Stroboscope Ward leonard control Metadyne 42. Name the person who was also known as Deshbandhu. Madan Mohan Malviya Chittaranjan Das G.K. Gokhale S. Radhakrishnan 43. 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) 44. Themost commonlyused semiconductoris……….. Silicon Germanium Carbon Sulphur 45. When a pure semiconductor is heated,its resistance ………….. Remains the same Goes up Goes down Can’t say 46. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Multiplication Operation Integration Operation Shifting Operation Folding Operation 47. Which property of fourier transform gives rise to an additional phase shift of -2? ftd for the generated time delay in the communication Linearity Time Scaling Duality Time Shifting 48. In a semiconductor,current conduction is due to …….. Only free electrons Holes and free electrons None of the above Only holes 49. Factor the following polynomial expression: x2 −x−12 (x + 1)(x−12) (x + 2)(x−6) (x + 4)(x−3) (x + 3)(x−4) 50. A semiconductor has………… temperature coefficient of resistance. Zero Negative Positive None of the above 51. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. Remains the same Decreases None of theabove Increases 52. .... is a closed loop system. Auto-pilot for an aircraft Electric switch Car starter Direct current generator 53. Who is known as “The Saint of Gutters”? Baba Amte None of these Mother Teresa Anna Hazare 54. Complex numbers are used in AC circuit analysis primarily to represent: Power Amplitude and phase shift Frequency Bandwidth and harmonic content 55. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Time Reversal Time Shifting Conjugation Frequency Shifting 56. Grand Central Terminal, Park Avenue, New York is the world’s None of the above longest railway station highest railway station largest railway station 57. 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 bounded output only if bounded input generates unbounded output 58. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 102.3 80.9 113 70.2 59. Which of the following devices are commonly used as error detectors in instruments ? Vernistats Microsyns Any of the above Resolvers 60. For telegraphy the most commonly used modulation system is single tone modulation PCM FSK two tone modulation 61. Which crop is sown on the largest area in India? Maize Rice Wheat Sugarcane 62. In an open loop control system Only system parameters have effect on the control output None of the above Output is independent of control input Output is dependent on control input 63. Which of the following should be done to make an unstable system stable ? The gain of the system should be decreased The gain of the system should be increased The number of poles to the loop transfer function should be increased The number of zeros to the loop transfer function should be increased 64. By which of the following the control action is determined when a man walks along a path ? Hands Brain Legs Eyes 65. A trivalent impurity has…..valence electrons 3 4 5 6 66. A semiconductor is formed by……… bonds. Co-ordinate None of the above Electrovalent Covalent 67. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Trapezoidal Triangular Rectangular Semi-circular 68. Positive logic in a logic circuit is one in which logic 0 voltage level is higher than logic 1 voltage level logicvoltage level is lower than logic1 voltage level logic0 and 1 are represented by 0and positive voltage respectively logic0 and,-1 are represented by negative and positive voltages respectively 69. To eliminate ghosts in the picture twist the transmission line use a longer transmission line change the antenna orientation of location connect a booster 70. A control system in which the control action is somehow dependent on the output is known as Semi closed loop system Open system None of the above Closed loop system 71. 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 72. Manipulate the following equation to solve for x: x = a/by x = aby x = y/ab x = ay/b 73. .... is a part of the human temperature control system. Ear Perspiration system Digestive system Leg movement 74. An automatic toaster is a ______ loop control system. partially closed closed open any of the above 75. Addition of trivalent impurity to a semiconductor creates many…….. Free electrons Valence electrons Holes Bound electrons 76. Which of the following national parks is not listed in a UNESCO World Heritage site? Sundarbans Kaziranga Keoladeo Kanha 77. 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 78. A semiconductor has generally……………… valence electrons. 4 3 2 6 79. The random motion of holes and free electrons due to thermal agitation is called ………. None of the above Pressure Ionisation Diffusion 80. A good control system has all the following features except good stability sufficient power handling capacity good stability good accuracy 81. Which type of system response to its input represents the zero value of its initial condition? Natural response Zero input response Total response Zero state response 82. 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 83. 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 depends on the input at an earlier time the output at the present does not depend on the factor of time at all 84. A signal g(t) = A then g(t) is a energy signal insucient data neither energy nor power signal power signal 85. A time invariant system is a system whose output vanishes with a delay in input remains same with a delay in input increases with a delay in input decreases with a delay in input 86. Has tendency to oscillate. Closed loop system Both (a) and (b) Open loop system Neither (a) nor (b) 87. The resistivity of pure germanium under standard conditionsis about………. 6x104 Ocm 60 Ocm 3x106 Ocm 6x10-4 Ocm 88. In open loop system the control action depends on system variables the control action depends on the input signal the control action depends on the size of the system the control action is independent of the output 89. For attenuation of high frequencies we should use inductance shunt capacitance resistance series capacitance 90. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & aperiodic Continuous & periodic Continuous & periodic Discrete & periodic 91. A system which is linear is said to obey the rules of both scaling and additivity scaling additivity homogeneity 92. For open control system which of the following statements is incorrect ? Recalibration is not required for maintaining the required quality of the output Construction is simple and maintenance easy Less expensive Errors are caused by disturbances 93. Convert an angle of 75 degrees into radians: 1.178 radians 0.7854 radians 1.571 radians 1.309 radians 94. 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 shifted step function originating at t = a unit step function a pulse function 95. Which of the following statements is not necessarily correct for open control system ? Less expensive Generally free from problems of non-linearities Presence of non-linearities causes malfunctioning Input command is the sole factor responsible for providing the control action 96. The initial response when tne output is not equal to input is called Error response Either of the above Transient response Dynamic response 97. In Modulation, “carrier” is resultant wave speech voltage to be transmitted voltage with constant frequency, phase or amplitude voltage for which frequency, phase or amplitude is varied 98. Which of the following personalities gave ‘The Laws of Heredity’? Robert Hook G.J. Mendel Charles Darwin William Harvey 99. The strength of a semiconductor crystal comes from …….. Electron-pair bonds None of the above Forces between nuclei Forces between protons 100. 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 Time is Up! Time's up