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 29, 2024 1. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & periodic Discrete & periodic Continuous & periodic Continuous & aperiodic 2. All causal systems must have the component of stability linearity time invariance memory 3. A system which is linear is said to obey the rules of additivity homogeneity both scaling and additivity scaling 4. A hole and electron in close proximity would tend to ………. Repel each other Have no effect on each other None of the above Attract each other 5. Which of the following statements is not necessarily correct for open control system ? Presence of non-linearities causes malfunctioning Input command is the sole factor responsible for providing the control action Less expensive Generally free from problems of non-linearities 6. An n-type semiconductor is……… Electrically neutral Negatively charged Positively charged None of the above 7. Which of the following ratios is equivalent to the ratio 25:300 ? 17:5 1:12 15:4 15:1 8. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Europe Asia Australia Africa 9. In a semiconductor,current conduction is due to …….. Holes and free electrons Only free electrons Only holes None of the above 10. Convert an angle of 75 degrees into radians: 0.7854 radians 1.571 radians 1.309 radians 1.178 radians 11. Damped sinusoids are _____ sinusoid signals divided by decaying exponentials sinusoid signals multiplied by decaying exponentials sinusoid signals divided by growing exponentials sinusoid signals multiplied by growing exponentials 12. Grand Central Terminal, Park Avenue, New York is the world’s longest railway station highest railway station None of the above largest railway station 13. For attenuation of high frequencies we should use shunt capacitance inductance series capacitance resistance 14. 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 large bandwidth is required quantising noise can be overcome by companding 15. 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 16. 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 17. Which crop is sown on the largest area in India? Maize Sugarcane Rice Wheat 18. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Zero initial condition Non-zero nal condition Zero nal condition Non-zero initial condition 19. Addition of trivalent impurity to a semiconductor creates many…….. Holes Valence electrons Free electrons Bound electrons 20. Name the person who was also known as Deshbandhu. Madan Mohan Malviya G.K. Gokhale Chittaranjan Das S. Radhakrishnan 21. A good control system has all the following features except good accuracy good stability good stability sufficient power handling capacity 22. As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes multiplication by s in the s domain multiplication by e-sT in the s domain division by e-sT in the s domain division by s in the s domain 23. Which of the following national parks is not listed in a UNESCO World Heritage site? Kaziranga Kanha Keoladeo Sundarbans 24. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Conjugation Frequency Shifting Time Shifting Time Reversal 25. A car is running at a constant speed of 50 km/h, which of the following is the feedback element for the driver ? Needle of the speedometer Eyes Steering wheel Clutch 26. Manipulate the following equation to solve for x: a = √bx2 x = √ab x =(a/b) 2 x = a/√b x = a2/b 27. A semiconductor is formed by……… bonds. Electrovalent None of the above Covalent Co-ordinate 28. A control system working under unknown random actions is called stochastic control system computer control system digital data system adaptive control system 29. A hole in a semiconductor is defined as……………. A free proton free neutron The incomplete part of an electron pair bond A free electron 30. The initial response when tne output is not equal to input is called Either of the above Dynamic response Error response Transient response 31. Calculate 27% of 340. 88.8 81.0 91.8 12.6 32. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Trapezoidal Triangular Semi-circular Rectangular 33. The resistivity of pure germanium under standard conditionsis about………. 60 Ocm 6x104 Ocm 3x106 Ocm 6x10-4 Ocm 34. A modem is classified as low speed if data rate handled is upto 250 bps upto 400 bps upto 600 bps upto 100 bps 35. The Fourier series of an odd periodic function contains sine harmonics only even harmonics only cosine harmonics only odd harmonics only 36. In closed loop control system, with positive value of feedback gain the overall gain of the system will be unaffected any of the above decrease increase 37. A semiconductor has generally……………… valence electrons. 6 4 2 3 38. Which of the following is an open loop control system ? Ward leonard control Stroboscope Field controlled D.C. motor Metadyne 39. Which of the following statements is correct? Convex lens has positive focal power and concave lens have negative focal power All lens have positive focal power All lens have negative focal power Convex lens has negative focal power and concave lens have positive focal power 40. In an open loop control system None of the above Output is dependent on control input Only system parameters have effect on the control output Output is independent of control input 41. 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. 20.01 meters 23.09 meters 40 meters 17.32 meters 42. For telegraphy the most commonly used modulation system is FSK single tone modulation PCM two tone modulation 43. A control system in which the control action is somehow dependent on the output is known as Closed loop system Open system None of the above Semi closed loop system 44. 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 system variables the control action depends on the input signal 45. 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 an earlier time 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 46. A woofer should be fed from the input through a high pass filter band stop filter band pass filter low pass filter 47. 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 48. Has tendency to oscillate. Open loop system Closed loop system Both (a) and (b) Neither (a) nor (b) 49. 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 a pulse function unit step function 50. Which among the following belongs to the category of non-recursive systems? Causal FIR Systems Causal IIR Systems Non-causal IIR Systems Non-causal FIR Systems 51. Complex numbers are used in AC circuit analysis primarily to represent: Power Amplitude and phase shift Bandwidth and harmonic content Frequency 52. Circular polarization is useful in reducing depolarization effect on received wave is useful in discrimination between reception of adjacent beams involves critical alignment of transmitting and receiving antenna none of the above 53. 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 gain of the system should be increased The number of zeros to the loop transfer function should be increased The gain of the system should be decreased 54. When a pentavalent impurity is added to a pure semiconductor,it becomes…… An insulator n-type semiconductor An intrinsic semiconductor p-type semiconductor 55. Under which conditions does an initially relaxed system become unstable ? only if bounded input generates unbounded output only if unbounded input generates bounded output only if bounded input generates bounded output only if unbounded input generates unbounded output 56. 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 57. A cordless telephone using separate frequencies for transmission in base and portable units is known as neither (a) nor (b) either (a) or (b) half duplex arrangement duplex arrangement 58. When a pure semiconductor is heated,its resistance ………….. Remains the same Goes up Can’t say Goes down 59. .... is a part of the human temperature control system. Leg movement Perspiration system Digestive system Ear 60. A semiconductor has………… temperature coefficient of resistance. None of the above Zero Positive Negative 61. Who is known as “The Saint of Gutters”? Mother Teresa Baba Amte None of these Anna Hazare 62. An automatic toaster is a ______ loop control system. any of the above partially closed closed open 63. A closed loop system is distinguished from open loop system by which of the following ? Feedback Output pattern Servo mechanism Input pattern 64. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. None of theabove Remains the same Decreases Increases 65. To eliminate ghosts in the picture connect a booster twist the transmission line change the antenna orientation of location use a longer transmission line 66. 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 Time Shifting Duality 67. Which of the following devices are commonly used as error detectors in instruments ? Any of the above Microsyns Resolvers Vernistats 68. The colour of an object is decided by the reflected colour none of the above the wavelength transmitted through it reflected colour for opaque object and wavelength transmitted through it for transparent objects 69. 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 70. A signal g(t) = A then g(t) is a power signal energy signal insucient data neither energy nor power signal 71. .... is a closed loop system. Electric switch Auto-pilot for an aircraft Direct current generator Car starter 72. Double integration of a unit step function would lead to a parabola an impulse a doublet a ramp 73. Factor the following polynomial expression: x2 −x−12 (x + 3)(x−4) (x + 4)(x−3) (x + 2)(x−6) (x + 1)(x−12) 74. By which of the following the control action is determined when a man walks along a path ? Legs Eyes Hands Brain 75. Positive logic in a logic circuit is one in which logic0 and 1 are represented by 0and positive voltage respectively 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 negative and positive voltages respectively 76. The random motion of holes and free electrons due to thermal agitation is called ………. None of the above Pressure Diffusion Ionisation 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. The strength of a semiconductor crystal comes from …….. Electron-pair bonds Forces between nuclei None of the above Forces between protons 79. Addition of pentavalent impurity to a semiconductor creates many…….. Valence electrons Bound electrons Free electrons Holes 80. If output power of a radio receiver is doubled, its volume is increased by __________ dB. -3 2 3 1 81. Which of the following personalities gave ‘The Laws of Heredity’? William Harvey G.J. Mendel Robert Hook Charles Darwin 82. Which type of system response to its input represents the zero value of its initial condition? Total response Zero input response Zero state response Natural response 83. Which of the following is an indirect way of generating FM? Varactor diode modulator Reactance FET modulator Armstrong modulator Reactance bipolar transistor 84. Any externally introduced signal affecting the controlled output is called a signal stimulus gain control feedback 85. Themost commonlyused semiconductoris……….. Silicon Sulphur Carbon Germanium 86. The resistivity of a pure silicon is about…………… 3x105Om 6000Ocm 6x10-8Ocm 100Ocm 87. Commercial Frequency deviation of FM is 80 kHz 65 kHz 75 kHz 70 kHz 88. In Modulation, “carrier” is voltage for which frequency, phase or amplitude is varied speech voltage to be transmitted voltage with constant frequency, phase or amplitude resultant wave 89. FFC stands for Film Finance Corporation forest film company None of the above Foreign Finance Corporation 90. For a low level AM system, the amplifiers modulated stage must be non-linear devices linear devices harmonic devices class C amplifiers 91. A pentavalent impurity has……….Valence electrons 5 6 4 3 92. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Shifting Operation Folding Operation Integration Operation Multiplication Operation 93. A trivalent impurity has…..valence electrons 3 5 6 4 94. For open control system which of the following statements is incorrect ? Less expensive Errors are caused by disturbances Construction is simple and maintenance easy Recalibration is not required for maintaining the required quality of the output 95. Manipulate the following equation to solve for x: x = ay/b x = aby x = a/by x = y/ab 96. 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 97. Garampani sanctuary is located at Gangtok, Sikkim Diphu, Assam Kohima, Nagaland Junagarh, Gujarat 98. The sine function is defined as ratio of side lengths, Adjacent divided by hypotenuse Opposite divided by hypotenuse Hypotenuse divided by adjacent Opposite divided by adjacent 99. Which of the following does not cause losses in optical fiber cables? Stepped index operation Attenuation in glass Impurities Micro bending 100. The frequency range of 300 kHz to 3000 kHz is known as medium frequency low frequency very high frequency high frequency Time's up