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:-September 27, 2023 1. A semiconductor has generally……………… valence electrons. 6 4 3 2 2. 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 3. VSB modulation is preferred in TV because it avoids phase distortion at low frequencies none of the above it results in better reception it reduces the bandwidth requirement to half 4. A trivalent impurity has…..valence electrons 4 3 6 5 5. 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 104 atoms 1 atom for 100 atoms 6. 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 = 1 ; y = 2 x = -2 ; y = 1 7. Factor the following polynomial expression: x2 −x−12 (x + 2)(x−6) (x + 1)(x−12) (x + 3)(x−4) (x + 4)(x−3) 8. Manipulate the following equation to solve for x: a = √bx2 x = √ab x = a/√b x =(a/b) 2 x = a2/b 9. FFC stands for None of the above forest film company Foreign Finance Corporation Film Finance Corporation 10. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Australia Europe Asia Africa 11. 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 12. In a semiconductor,current conduction is due to …….. Only free electrons None of the above Holes and free electrons Only holes 13. A signal g(t) = A then g(t) is a power signal insucient data neither energy nor power signal energy signal 14. .... is a closed loop system. Auto-pilot for an aircraft Electric switch Direct current generator Car starter 15. 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 Duality Linearity Time Scaling 16. Double integration of a unit step function would lead to an impulse a doublet a parabola a ramp 17. Any externally introduced signal affecting the controlled output is called a stimulus feedback signal gain control 18. Which of the following statements is not necessarily correct for open control system ? Generally free from problems of non-linearities Less expensive Presence of non-linearities causes malfunctioning Input command is the sole factor responsible for providing the control action 19. A system which is linear is said to obey the rules of additivity scaling homogeneity both scaling and additivity 20. In open loop system the control action depends on the input signal the control action depends on system variables the control action depends on the size of the system the control action is independent of the output 21. In Pulse Code Modulation system quantising noise can be reduced by decreasing the number of standard levels large bandwidth is required quantising noise can be overcome by companding suffers from the disadvantage of its incompatibly with TDM 22. Which type of system response to its input represents the zero value of its initial condition? Total response Natural response Zero input response Zero state response 23. A hole and electron in close proximity would tend to ………. Repel each other Attract each other None of the above Have no effect on each other 24. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. Increases Decreases Remains the same None of theabove 25. Which of the following does not cause losses in optical fiber cables? Attenuation in glass Micro bending Stepped index operation Impurities 26. 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 does not depend on the factor of time at all the output at the present depends on the input at the current time 27. A closed loop system is distinguished from open loop system by which of the following ? Servo mechanism Output pattern Input pattern Feedback 28. A pentavalent impurity has……….Valence electrons 5 6 3 4 29. Which of the following is an open loop control system ? Metadyne Field controlled D.C. motor Ward leonard control Stroboscope 30. In an open loop control system Output is independent of control input Output is dependent on control input Only system parameters have effect on the control output None of the above 31. Garampani sanctuary is located at Junagarh, Gujarat Gangtok, Sikkim Kohima, Nagaland Diphu, Assam 32. Which of the following statements is correct? Convex lens has negative focal power and concave lens have positive focal power All lens have negative focal power Convex lens has positive focal power and concave lens have negative focal power All lens have positive focal power 33. When a pure semiconductor is heated,its resistance ………….. Goes down Can’t say Remains the same Goes up 34. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Rectangular Triangular Trapezoidal Semi-circular 35. A time invariant system is a system whose output decreases with a delay in input increases with a delay in input vanishes with a delay in input remains same with a delay in input 36. Which of the following ratios is equivalent to the ratio 25:300 ? 17:5 15:1 15:4 1:12 37. A good control system has all the following features except sufficient power handling capacity good stability good stability good accuracy 38. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Integration Operation Multiplication Operation Folding Operation Shifting Operation 39. Positive logic in a logic circuit is one in which 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 logic 0 voltage level is higher than logic 1 voltage level 40. 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 unbounded output only if unbounded input generates bounded output 41. For attenuation of high frequencies we should use shunt capacitance inductance series capacitance resistance 42. The resistivity of a pure silicon is about…………… 6x10-8Ocm 3x105Om 100Ocm 6000Ocm 43. For telegraphy the most commonly used modulation system is PCM two tone modulation FSK single tone modulation 44. Which crop is sown on the largest area in India? Wheat Maize Sugarcane Rice 45. Name the person who was also known as Deshbandhu. Chittaranjan Das G.K. Gokhale S. Radhakrishnan Madan Mohan Malviya 46. .... is a part of the human temperature control system. Perspiration system Leg movement Digestive system Ear 47. Who is known as “The Saint of Gutters”? None of these Anna Hazare Baba Amte Mother Teresa 48. By which of the following the control action is determined when a man walks along a path ? Eyes Brain Hands Legs 49. 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. 40 meters 23.09 meters 17.32 meters 20.01 meters 50. Circular polarization is useful in reducing depolarization effect on received wave involves critical alignment of transmitting and receiving antenna none of the above is useful in discrimination between reception of adjacent beams 51. 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 Clutch Steering wheel Eyes 52. Addition of pentavalent impurity to a semiconductor creates many…….. Holes Free electrons Valence electrons Bound electrons 53. The strength of a semiconductor crystal comes from …….. Forces between protons Electron-pair bonds None of the above Forces between nuclei 54. Which of the following devices are commonly used as error detectors in instruments ? Resolvers Any of the above Vernistats Microsyns 55. Which of the following is an indirect way of generating FM? Varactor diode modulator Armstrong modulator Reactance bipolar transistor Reactance FET modulator 56. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 1 3 -3 2 57. A semiconductor has………… temperature coefficient of resistance. Negative Positive None of the above Zero 58. All causal systems must have the component of linearity time invariance memory stability 59. 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 a shifted step function originating at t = a unit step function a step function 60. Has tendency to oscillate. Neither (a) nor (b) Open loop system Closed loop system Both (a) and (b) 61. The Fourier series of an odd periodic function contains sine harmonics only cosine harmonics only odd harmonics only even harmonics only 62. Manipulate the following equation to solve for x: x = aby x = a/by x = ay/b x = y/ab 63. A control system working under unknown random actions is called stochastic control system adaptive control system digital data system computer control system 64. The sine function is deﬁned as ratio of side lengths, Adjacent divided by hypotenuse Hypotenuse divided by adjacent Opposite divided by adjacent Opposite divided by hypotenuse 65. Grand Central Terminal, Park Avenue, New York is the world’s largest railway station highest railway station longest railway station None of the above 66. Damped sinusoids are _____ sinusoid signals divided by growing exponentials sinusoid signals divided by decaying exponentials sinusoid signals multiplied by growing exponentials sinusoid signals multiplied by decaying exponentials 67. Addition of trivalent impurity to a semiconductor creates many…….. Bound electrons Valence electrons Free electrons Holes 68. Which of the following national parks is not listed in a UNESCO World Heritage site? Kanha Keoladeo Kaziranga Sundarbans 69. Convert an angle of 75 degrees into radians: 1.571 radians 1.178 radians 1.309 radians 0.7854 radians 70. A woofer should be fed from the input through a high pass filter band pass filter low pass filter band stop filter 71. The random motion of holes and free electrons due to thermal agitation is called ………. Pressure Diffusion None of the above Ionisation 72. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 70.2 80.9 102.3 113 73. Calculate 27% of 340. 88.8 81.0 12.6 91.8 74. The initial response when tne output is not equal to input is called Either of the above Error response Dynamic response Transient response 75. An automatic toaster is a ______ loop control system. open closed any of the above partially closed 76. An n-type semiconductor is……… Negatively charged Electrically neutral None of the above Positively charged 77. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Zero initial condition Zero nal condition Non-zero initial condition Non-zero nal condition 78. 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 none of the above the reflected colour 79. The resistivity of pure germanium under standard conditionsis about………. 3x106 Ocm 60 Ocm 6x10-4 Ocm 6x104 Ocm 80. 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 81. For a low level AM system, the amplifiers modulated stage must be linear devices harmonic devices non-linear devices class C amplifiers 82. Which of the following personalities gave ‘The Laws of Heredity’? G.J. Mendel William Harvey Robert Hook Charles Darwin 83. Complex numbers are used in AC circuit analysis primarily to represent: Bandwidth and harmonic content Amplitude and phase shift Frequency Power 84. In closed loop control system, with positive value of feedback gain the overall gain of the system will any of the above decrease increase be unaffected 85. 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 division by s in the s domain multiplication by s in the s domain 86. When a pentavalent impurity is added to a pure semiconductor,it becomes…… An intrinsic semiconductor An insulator p-type semiconductor n-type semiconductor 87. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & aperiodic Continuous & periodic Discrete & periodic Continuous & periodic 88. Which of the following should be done to make an unstable system stable ? The number of zeros to the loop transfer function should be increased The gain of the system should be decreased The number of poles to the loop transfer function should be increased The gain of the system should be increased 89. A hole in a semiconductor is defined as……………. The incomplete part of an electron pair bond free neutron A free proton A free electron 90. A semiconductor is formed by……… bonds. Electrovalent Covalent None of the above Co-ordinate 91. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Conjugation Time Reversal Time Shifting Frequency Shifting 92. Themost commonlyused semiconductoris……….. Silicon Carbon Sulphur Germanium 93. A control system in which the control action is somehow dependent on the output is known as None of the above Semi closed loop system Open system Closed loop system 94. Reactance bipolar transistor the radiation at right angles is zero the radiation is zero in all directions the radiation at right angles is zero the radiation is maximum in all directions 95. A modem is classified as low speed if data rate handled is upto 250 bps upto 600 bps upto 400 bps upto 100 bps 96. To eliminate ghosts in the picture twist the transmission line use a longer transmission line connect a booster change the antenna orientation of location 97. In Modulation, “carrier” is speech voltage to be transmitted voltage for which frequency, phase or amplitude is varied voltage with constant frequency, phase or amplitude resultant wave 98. Commercial Frequency deviation of FM is 65 kHz 80 kHz 75 kHz 70 kHz 99. The frequency range of 300 kHz to 3000 kHz is known as very high frequency low frequency high frequency medium frequency 100. A cordless telephone using separate frequencies for transmission in base and portable units is known as neither (a) nor (b) half duplex arrangement duplex arrangement either (a) or (b) Time is Up! Time's up