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 19, 2022 1. Damped sinusoids are _____ sinusoid signals divided by decaying exponentials sinusoid signals multiplied by decaying exponentials sinusoid signals multiplied by growing exponentials sinusoid signals divided by growing exponentials 2. 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. 17.32 meters 20.01 meters 23.09 meters 40 meters 3. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Shifting Operation Multiplication Operation Folding Operation Integration Operation 4. 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 5. Which of the following personalities gave ‘The Laws of Heredity’? Charles Darwin William Harvey G.J. Mendel Robert Hook 6. Themost commonlyused semiconductoris……….. Silicon Germanium Carbon Sulphur 7. Any externally introduced signal affecting the controlled output is called a feedback stimulus signal gain control 8. Circular polarization none of the above involves critical alignment of transmitting and receiving antenna is useful in discrimination between reception of adjacent beams is useful in reducing depolarization effect on received wave 9. Under which conditions does an initially relaxed system become unstable ? only if bounded input generates bounded output only if unbounded input generates unbounded output only if unbounded input generates bounded output only if bounded input generates unbounded output 10. A closed loop system is distinguished from open loop system by which of the following ? Output pattern Servo mechanism Input pattern Feedback 11. A trivalent impurity has…..valence electrons 6 3 5 4 12. 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 13. A semiconductor has generally……………… valence electrons. 6 3 2 4 14. Factor the following polynomial expression: x2 −x−12 (x + 2)(x−6) (x + 3)(x−4) (x + 4)(x−3) (x + 1)(x−12) 15. Reactance bipolar transistor the radiation at right angles is zero the radiation at right angles is zero the radiation is zero in all directions the radiation is maximum in all directions 16. 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 17. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 3 2 1 -3 18. A cordless telephone using separate frequencies for transmission in base and portable units is known as duplex arrangement neither (a) nor (b) either (a) or (b) half duplex arrangement 19. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Time Shifting Time Reversal Conjugation Frequency Shifting 20. Which of the following is an open loop control system ? Field controlled D.C. motor Stroboscope Ward leonard control Metadyne 21. Commercial Frequency deviation of FM is 75 kHz 80 kHz 65 kHz 70 kHz 22. A woofer should be fed from the input through a low pass filter band stop filter band pass filter high pass filter 23. .... is a closed loop system. Electric switch Direct current generator Car starter Auto-pilot for an aircraft 24. Double integration of a unit step function would lead to a parabola an impulse a doublet a ramp 25. 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 26. In an open loop control system Output is dependent on control input Output is independent of control input None of the above Only system parameters have effect on the control output 27. A pentavalent impurity has……….Valence electrons 3 5 4 6 28. When a pure semiconductor is heated,its resistance ………….. Remains the same Goes up Goes down Can’t say 29. To eliminate ghosts in the picture connect a booster use a longer transmission line change the antenna orientation of location twist the transmission line 30. 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 Linearity Duality 31. A car is running at a constant speed of 50 km/h, which of the following is the feedback element for the driver ? Eyes Steering wheel Clutch Needle of the speedometer 32. The Fourier series of an odd periodic function contains odd harmonics only sine harmonics only even harmonics only cosine harmonics only 33. Positive logic in a logic circuit is one in which logic0 and 1 are represented by 0and positive voltage respectively logic0 and,-1 are represented by negative and positive voltages respectively logicvoltage level is lower than logic1 voltage level logic 0 voltage level is higher than logic 1 voltage level 34. 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 35. A control system in which the control action is somehow dependent on the output is known as Semi closed loop system Closed loop system Open system None of the above 36. .... is a part of the human temperature control system. Digestive system Ear Leg movement Perspiration system 37. Addition of trivalent impurity to a semiconductor creates many…….. Holes Free electrons Valence electrons Bound electrons 38. A hole in a semiconductor is defined as……………. A free proton The incomplete part of an electron pair bond A free electron free neutron 39. The frequency range of 300 kHz to 3000 kHz is known as high frequency low frequency medium frequency very high frequency 40. 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 41. A modem is classified as low speed if data rate handled is upto 250 bps upto 600 bps upto 400 bps upto 100 bps 42. Which crop is sown on the largest area in India? Sugarcane Wheat Rice Maize 43. A time invariant system is a system whose output remains same with a delay in input vanishes with a delay in input increases with a delay in input decreases with a delay in input 44. 45. A semiconductor is formed by……… bonds. Covalent Co-ordinate None of the above Electrovalent 46. For telegraphy the most commonly used modulation system is FSK two tone modulation PCM single tone modulation 47. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & periodic Discrete & periodic Continuous & aperiodic Continuous & periodic 48. A semiconductor has………… temperature coefficient of resistance. None of the above Negative Zero Positive 49. FFC stands for Film Finance Corporation forest film company Foreign Finance Corporation None of the above 50. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Africa Asia Europe Australia 51. The sine function is deﬁned as ratio of side lengths, Opposite divided by hypotenuse Opposite divided by adjacent Hypotenuse divided by adjacent Adjacent divided by hypotenuse 52. Convert an angle of 75 degrees into radians: 1.571 radians 1.309 radians 1.178 radians 0.7854 radians 53. Name the person who was also known as Deshbandhu. S. Radhakrishnan G.K. Gokhale Chittaranjan Das Madan Mohan Malviya 54. 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 shifted step function originating at t = a a step function a pulse function 55. Addition of pentavalent impurity to a semiconductor creates many…….. Holes Bound electrons Free electrons Valence electrons 56. A hole and electron in close proximity would tend to ………. None of the above Have no effect on each other Attract each other Repel each other 57. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. Increases None of theabove Decreases Remains the same 58. The resistivity of a pure silicon is about…………… 6000Ocm 100Ocm 3x105Om 6x10-8Ocm 59. Manipulate the following equation to solve for x: a = √bx2 x =(a/b) 2 x = a/√b x = a2/b x = √ab 60. Which of the following is an indirect way of generating FM? Varactor diode modulator Reactance FET modulator Reactance bipolar transistor Armstrong modulator 61. Manipulate the following equation to solve for x: x = ay/b x = aby x = a/by x = y/ab 62. Which of the following devices are commonly used as error detectors in instruments ? Resolvers Any of the above Microsyns Vernistats 63. Which of the following ratios is equivalent to the ratio 25:300 ? 1:12 17:5 15:1 15:4 64. Which among the following belongs to the category of non-recursive systems? Causal FIR Systems Causal IIR Systems Non-causal FIR Systems Non-causal IIR Systems 65. A signal g(t) = A then g(t) is a neither energy nor power signal energy signal power signal insucient data 66. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Semi-circular Triangular Trapezoidal Rectangular 67. Has tendency to oscillate. Open loop system Closed loop system Both (a) and (b) Neither (a) nor (b) 68. 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 69. As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes multiplication by s in the s domain division by e-sT in the s domain multiplication by e-sT in the s domain division by s in the s domain 70. The strength of a semiconductor crystal comes from …….. Electron-pair bonds None of the above Forces between nuclei Forces between protons 71. The resistivity of pure germanium under standard conditionsis about………. 6x104 Ocm 60 Ocm 6x10-4 Ocm 3x106 Ocm 72. When a pentavalent impurity is added to a pure semiconductor,it becomes…… p-type semiconductor n-type semiconductor An insulator An intrinsic semiconductor 73. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 1 atom for 108 atoms 10 atoms for 108 atoms 1 atom for 100 atoms 1 atom for 104 atoms 74. Complex numbers are used in AC circuit analysis primarily to represent: Power Frequency Amplitude and phase shift Bandwidth and harmonic content 75. An automatic toaster is a ______ loop control system. open partially closed closed any of the above 76. 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 frequency domain & shape of spectrum can be interchangeable Shape of signal in time domain & shape of spectrum can be interchangeable 77. Which of the following national parks is not listed in a UNESCO World Heritage site? Keoladeo Sundarbans Kanha Kaziranga 78. Calculate 27% of 340. 88.8 12.6 81.0 91.8 79. An n-type semiconductor is……… Positively charged None of the above Negatively charged Electrically neutral 80. Who is known as “The Saint of Gutters”? Anna Hazare Baba Amte None of these Mother Teresa 81. For open control system which of the following statements is incorrect ? Less expensive Recalibration is not required for maintaining the required quality of the output Construction is simple and maintenance easy Errors are caused by disturbances 82. For a low level AM system, the amplifiers modulated stage must be class C amplifiers non-linear devices harmonic devices linear devices 83. A good control system has all the following features except good stability sufficient power handling capacity good accuracy good stability 84. VSB modulation is preferred in TV because it reduces the bandwidth requirement to half none of the above it results in better reception it avoids phase distortion at low frequencies 85. A system which is linear is said to obey the rules of homogeneity scaling additivity both scaling and additivity 86. By which of the following the control action is determined when a man walks along a path ? Legs Hands Brain Eyes 87. In a semiconductor,current conduction is due to …….. Holes and free electrons Only free electrons None of the above Only holes 88. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Zero nal condition Zero initial condition Non-zero initial condition Non-zero nal condition 89. 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 90. A control system working under unknown random actions is called stochastic control system digital data system adaptive control system computer control system 91. The random motion of holes and free electrons due to thermal agitation is called ………. Pressure Ionisation Diffusion None of the above 92. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 113 80.9 70.2 102.3 93. The initial response when tne output is not equal to input is called Transient response Either of the above Error response Dynamic response 94. 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 95. Grand Central Terminal, Park Avenue, New York is the world’s longest railway station highest railway station largest railway station None of the above 96. Which of the following does not cause losses in optical fiber cables? Micro bending Stepped index operation Attenuation in glass Impurities 97. All causal systems must have the component of time invariance stability linearity memory 98. For attenuation of high frequencies we should use series capacitance inductance shunt capacitance resistance 99. Garampani sanctuary is located at Junagarh, Gujarat Kohima, Nagaland Gangtok, Sikkim Diphu, Assam 100. In Pulse Code Modulation system suffers from the disadvantage of its incompatibly with TDM large bandwidth is required quantising noise can be overcome by companding quantising noise can be reduced by decreasing the number of standard levels 101. In Modulation, “carrier” is resultant wave voltage for which frequency, phase or amplitude is varied speech voltage to be transmitted voltage with constant frequency, phase or amplitude Time is Up! Time's up