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:-November 22, 2024 1. In open loop system 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 the control action depends on the input signal 2. The resistivity of pure germanium under standard conditionsis about………. 3x106 Ocm 6x104 Ocm 6x10-4 Ocm 60 Ocm 3. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Non-zero initial condition Non-zero nal condition Zero initial condition Zero nal condition 4. Which of the following devices are commonly used as error detectors in instruments ? Resolvers Microsyns Vernistats Any of the above 5. A hole and electron in close proximity would tend to ………. Have no effect on each other Repel each other Attract each other None of the above 6. Addition of pentavalent impurity to a semiconductor creates many…….. Bound electrons Valence electrons Free electrons Holes 7. 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 8. A semiconductor is formed by……… bonds. None of the above Electrovalent Co-ordinate Covalent 9. Calculate 27% of 340. 12.6 91.8 81.0 88.8 10. 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 11. All causal systems must have the component of linearity time invariance memory stability 12. An n-type semiconductor is……… Electrically neutral Positively charged None of the above Negatively charged 13. The random motion of holes and free electrons due to thermal agitation is called ………. Pressure Ionisation None of the above Diffusion 14. A control system working under unknown random actions is called stochastic control system computer control system digital data system adaptive control system 15. Manipulate the following equation to solve for x: a = √bx2 x = √ab x = a/√b x =(a/b) 2 x = a2/b 16. By which of the following the control action is determined when a man walks along a path ? Legs Brain Hands Eyes 17. A semiconductor has generally……………… valence electrons. 2 3 6 4 18. A semiconductor has………… temperature coefficient of resistance. Negative None of the above Zero Positive 19. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 2 3 1 -3 20. Which of the following national parks is not listed in a UNESCO World Heritage site? Kaziranga Kanha Sundarbans Keoladeo 21. For attenuation of high frequencies we should use resistance series capacitance inductance shunt capacitance 22. In Modulation, “carrier” is resultant wave speech voltage to be transmitted voltage for which frequency, phase or amplitude is varied voltage with constant frequency, phase or amplitude 23. Any externally introduced signal affecting the controlled output is called a stimulus feedback signal gain control 24. Which of the following should be done to make an unstable system stable ? 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 The number of zeros to the loop transfer function should be increased 25. 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 80.9 113 26. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Time Shifting Frequency Shifting Conjugation Time Reversal 27. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & aperiodic Continuous & periodic Discrete & periodic Continuous & periodic 28. Reactance bipolar transistor the radiation is maximum in all directions the radiation at right angles is zero the radiation at right angles is zero the radiation is zero in all directions 29. In Pulse Code Modulation system large bandwidth is required suffers from the disadvantage of its incompatibly with TDM quantising noise can be reduced by decreasing the number of standard levels quantising noise can be overcome by companding 30. 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 negative and positive voltages respectively logicvoltage level is lower than logic1 voltage level logic0 and 1 are represented by 0and positive voltage respectively 31. The resistivity of a pure silicon is about…………… 100Ocm 3x105Om 6000Ocm 6x10-8Ocm 32. A trivalent impurity has…..valence electrons 6 3 4 5 33. Has tendency to oscillate. Open loop system Both (a) and (b) Neither (a) nor (b) Closed loop system 34. Which of the following ratios is equivalent to the ratio 25:300 ? 17:5 15:1 15:4 1:12 35. In a semiconductor,current conduction is due to …….. Only holes Holes and free electrons None of the above Only free electrons 36. The frequency range of 300 kHz to 3000 kHz is known as low frequency medium frequency very high frequency high frequency 37. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Shifting Operation Integration Operation Folding Operation Multiplication Operation 38. Which of the following does not cause losses in optical fiber cables? Impurities Stepped index operation Attenuation in glass Micro bending 39. 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 20.01 meters 40 meters 17.32 meters 40. 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 s in the s domain division by e-sT in the s domain 41. .... is a closed loop system. Direct current generator Auto-pilot for an aircraft Electric switch Car starter 42. Complex numbers are used in AC circuit analysis primarily to represent: Bandwidth and harmonic content Amplitude and phase shift Power Frequency 43. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Trapezoidal Semi-circular Rectangular Triangular 44. An automatic toaster is a ______ loop control system. any of the above closed open partially closed 45. The strength of a semiconductor crystal comes from …….. Electron-pair bonds Forces between protons None of the above Forces between nuclei 46. Manipulate the following equation to solve for x: x = y/ab x = ay/b x = aby x = a/by 47. Themost commonlyused semiconductoris……….. Silicon Carbon Sulphur Germanium 48. A modem is classified as low speed if data rate handled is upto 600 bps upto 100 bps upto 400 bps upto 250 bps 49. Who is known as “The Saint of Gutters”? Mother Teresa Baba Amte Anna Hazare None of these 50. Under which conditions does an initially relaxed system become unstable ? only if bounded input generates bounded output only if unbounded input generates bounded output only if unbounded input generates unbounded output only if bounded input generates unbounded output 51. Double integration of a unit step function would lead to a doublet an impulse a ramp a parabola 52. VSB modulation is preferred in TV because it results in better reception it reduces the bandwidth requirement to half none of the above it avoids phase distortion at low frequencies 53. The initial response when tne output is not equal to input is called Transient response Either of the above Error response Dynamic response 54. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. Remains the same Increases Decreases None of theabove 55. Which of the following statements is not necessarily correct for open control system ? Input command is the sole factor responsible for providing the control action Generally free from problems of non-linearities Presence of non-linearities causes malfunctioning Less expensive 56. In closed loop control system, with positive value of feedback gain the overall gain of the system will decrease increase any of the above be unaffected 57. A woofer should be fed from the input through a high pass filter band stop filter band pass filter low pass filter 58. Which of the following is an indirect way of generating FM? Varactor diode modulator Reactance bipolar transistor Reactance FET modulator Armstrong modulator 59. The colour of an object is decided by reflected colour for opaque object and wavelength transmitted through it for transparent objects none of the above the wavelength transmitted through it the reflected colour 60. 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 pulse function a shifted step function originating at t = a a step function 61. For a low level AM system, the amplifiers modulated stage must be linear devices harmonic devices class C amplifiers non-linear devices 62. A signal g(t) = A then g(t) is a insucient data power signal energy signal neither energy nor power signal 63. To eliminate ghosts in the picture connect a booster twist the transmission line change the antenna orientation of location use a longer transmission line 64. A closed loop system is distinguished from open loop system by which of the following ? Servo mechanism Feedback Input pattern Output pattern 65. The Fourier series of an odd periodic function contains cosine harmonics only sine harmonics only even harmonics only odd harmonics only 66. A hole in a semiconductor is defined as……………. A free electron The incomplete part of an electron pair bond free neutron A free proton 67. In an open loop control system Only system parameters have effect on the control output Output is dependent on control input None of the above Output is independent of control input 68. When a pentavalent impurity is added to a pure semiconductor,it becomes…… n-type semiconductor An insulator An intrinsic semiconductor p-type semiconductor 69. Damped sinusoids are _____ sinusoid signals divided by decaying exponentials sinusoid signals divided by growing exponentials sinusoid signals multiplied by growing exponentials sinusoid signals multiplied by decaying exponentials 70. For open control system which of the following statements is incorrect ? Recalibration is not required for maintaining the required quality of the output Less expensive Errors are caused by disturbances Construction is simple and maintenance easy 71. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 1 atom for 100 atoms 1 atom for 104 atoms 10 atoms for 108 atoms 1 atom for 108 atoms 72. Addition of trivalent impurity to a semiconductor creates many…….. Valence electrons Holes Bound electrons Free electrons 73. When a pure semiconductor is heated,its resistance ………….. Goes up Remains the same Can’t say Goes down 74. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Asia Australia Europe Africa 75. A system which is linear is said to obey the rules of additivity both scaling and additivity scaling homogeneity 76. Which property of fourier transform gives rise to an additional phase shift of -2? ftd for the generated time delay in the communication Duality Time Scaling Time Shifting Linearity 77. A cordless telephone using separate frequencies for transmission in base and portable units is known as duplex arrangement half duplex arrangement either (a) or (b) neither (a) nor (b) 78. A system is said to be dened as non causal, when 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 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 79. A car is running at a constant speed of 50 km/h, which of the following is the feedback element for the driver ? Eyes Needle of the speedometer Steering wheel Clutch 80. FFC stands for Foreign Finance Corporation Film Finance Corporation forest film company None of the above 81. A good control system has all the following features except good stability sufficient power handling capacity good accuracy good stability 82. Grand Central Terminal, Park Avenue, New York is the world’s longest railway station largest railway station None of the above highest railway station 83. 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 84. Which of the following is an open loop control system ? Ward leonard control Field controlled D.C. motor Metadyne Stroboscope 85. Name the person who was also known as Deshbandhu. Chittaranjan Das G.K. Gokhale Madan Mohan Malviya S. Radhakrishnan 86. Garampani sanctuary is located at Junagarh, Gujarat Gangtok, Sikkim Kohima, Nagaland Diphu, Assam 87. Which among the following belongs to the category of non-recursive systems? Causal FIR Systems Non-causal FIR Systems Non-causal IIR Systems Causal IIR Systems 88. .... is a part of the human temperature control system. Leg movement Ear Perspiration system Digestive system 89. Which of the following personalities gave ‘The Laws of Heredity’? G.J. Mendel Robert Hook William Harvey Charles Darwin 90. Factor the following polynomial expression: x2 −x−12 (x + 1)(x−12) (x + 3)(x−4) (x + 2)(x−6) (x + 4)(x−3) 91. Convert an angle of 75 degrees into radians: 0.7854 radians 1.309 radians 1.571 radians 1.178 radians 92. Commercial Frequency deviation of FM is 65 kHz 80 kHz 70 kHz 75 kHz 93. A time invariant system is a system whose output remains same with a delay in input vanishes with a delay in input decreases with a delay in input increases with a delay in input 94. For telegraphy the most commonly used modulation system is single tone modulation two tone modulation FSK PCM 95. 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 96. Which crop is sown on the largest area in India? Maize Rice Sugarcane Wheat 97. 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 Convex lens has positive focal power and concave lens have negative focal power All lens have positive focal power 98. Which type of system response to its input represents the zero value of its initial condition? Total response Zero input response Natural response Zero state response 99. A pentavalent impurity has……….Valence electrons 5 4 3 6 100. 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 Time's up
