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:-December 23, 2024 1. The Fourier series of an odd periodic function contains odd harmonics only sine harmonics only cosine harmonics only even harmonics only 2. Which crop is sown on the largest area in India? Wheat Rice Maize Sugarcane 3. To eliminate ghosts in the picture use a longer transmission line change the antenna orientation of location twist the transmission line connect a booster 4. The sine function is defined as ratio of side lengths, Adjacent divided by hypotenuse Opposite divided by adjacent Hypotenuse divided by adjacent Opposite divided by hypotenuse 5. VSB modulation is preferred in TV because it avoids phase distortion at low frequencies it results in better reception it reduces the bandwidth requirement to half none of the above 6. An automatic toaster is a ______ loop control system. partially closed open closed any of the above 7. The strength of a semiconductor crystal comes from …….. Electron-pair bonds Forces between protons Forces between nuclei None of the above 8. A control system in which the control action is somehow dependent on the output is known as Closed loop system None of the above Open system Semi closed loop system 9. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & aperiodic Discrete & periodic Continuous & periodic Continuous & periodic 10. Which among the following belongs to the category of non-recursive systems? Causal IIR Systems Non-causal FIR Systems Causal FIR Systems Non-causal IIR Systems 11. Has tendency to oscillate. Neither (a) nor (b) Open loop system Both (a) and (b) Closed loop system 12. A good control system has all the following features except good stability good stability good accuracy sufficient power handling capacity 13. Which of the following is an open loop control system ? Ward leonard control Stroboscope Field controlled D.C. motor Metadyne 14. For a low level AM system, the amplifiers modulated stage must be harmonic devices class C amplifiers non-linear devices linear devices 15. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Frequency Shifting Time Reversal Time Shifting Conjugation 16. Which of the following is an indirect way of generating FM? Varactor diode modulator Reactance FET modulator Armstrong modulator Reactance bipolar transistor 17. For telegraphy the most commonly used modulation system is FSK PCM single tone modulation two tone modulation 18. A cordless telephone using separate frequencies for transmission in base and portable units is known as half duplex arrangement duplex arrangement neither (a) nor (b) either (a) or (b) 19. A trivalent impurity has…..valence electrons 3 6 4 5 20. Grand Central Terminal, Park Avenue, New York is the world’s largest railway station longest railway station None of the above highest railway station 21. .... is a part of the human temperature control system. Perspiration system Leg movement Ear Digestive system 22. Which of the following national parks is not listed in a UNESCO World Heritage site? Keoladeo Kanha Kaziranga Sundarbans 23. 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 24. The initial response when tne output is not equal to input is called Dynamic response Transient response Either of the above Error response 25. The frequency range of 300 kHz to 3000 kHz is known as high frequency medium frequency low frequency very high frequency 26. Which of the following statements is correct? 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 negative focal power All lens have positive focal power 27. FFC stands for forest film company Foreign Finance Corporation None of the above Film Finance Corporation 28. Manipulate the following equation to solve for x: a = √bx2 x = √ab x =(a/b) 2 x = a2/b x = a/√b 29. 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 30. A system which is linear is said to obey the rules of scaling additivity both scaling and additivity homogeneity 31. 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 32. 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 40 meters 23.09 meters 33. A hole and electron in close proximity would tend to ………. None of the above Repel each other Have no effect on each other Attract each other 34. The random motion of holes and free electrons due to thermal agitation is called ………. None of the above Diffusion Ionisation Pressure 35. Solve for both x and y in this simultaneous system of equations: x + 3y = −1, 4x−y = 9 x = 1 ; y = 2 x = 2 ; y = 1 x = -2 ; y = 1 x = 2 ; y = -1 36. Damped sinusoids are _____ sinusoid signals multiplied by growing exponentials sinusoid signals divided by growing exponentials sinusoid signals multiplied by decaying exponentials sinusoid signals divided by decaying exponentials 37. For open control system which of the following statements is incorrect ? Construction is simple and maintenance easy Less expensive Recalibration is not required for maintaining the required quality of the output Errors are caused by disturbances 38. Garampani sanctuary is located at Junagarh, Gujarat Gangtok, Sikkim Diphu, Assam Kohima, Nagaland 39. Themost commonlyused semiconductoris……….. Sulphur Germanium Silicon Carbon 40. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Rectangular Semi-circular Trapezoidal Triangular 41. Commercial Frequency deviation of FM is 65 kHz 75 kHz 70 kHz 80 kHz 42. When a pentavalent impurity is added to a pure semiconductor,it becomes…… An intrinsic semiconductor p-type semiconductor n-type semiconductor An insulator 43. A pentavalent impurity has……….Valence electrons 6 3 5 4 44. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Australia Asia Europe Africa 45. Manipulate the following equation to solve for x: x = y/ab x = ay/b x = a/by x = aby 46. .... is a closed loop system. Direct current generator Electric switch Auto-pilot for an aircraft Car starter 47. A system is said to be dened as non causal, when 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 depends on the input at the current time the output at the present does not depend on the factor of time at all 48. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 10 atoms for 108 atoms 1 atom for 100 atoms 1 atom for 108 atoms 1 atom for 104 atoms 49. The resistivity of a pure silicon is about…………… 3x105Om 6000Ocm 100Ocm 6x10-8Ocm 50. A hole in a semiconductor is defined as……………. The incomplete part of an electron pair bond A free electron free neutron A free proton 51. 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 multiplication by s in the s domain division by s in the s domain 52. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 1 -3 3 2 53. 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 Eyes Needle of the speedometer Clutch 54. By which of the following the control action is determined when a man walks along a path ? Hands Brain Eyes Legs 55. Under which conditions does an initially relaxed system become unstable ? only if bounded input generates unbounded output only if bounded input generates bounded output only if unbounded input generates unbounded output only if unbounded input generates bounded output 56. A closed loop system is distinguished from open loop system by which of the following ? Output pattern Input pattern Servo mechanism Feedback 57. In a semiconductor,current conduction is due to …….. Holes and free electrons Only free electrons Only holes None of the above 58. In an open loop control system None of the above Output is independent of control input Only system parameters have effect on the control output Output is dependent on control input 59. For attenuation of high frequencies we should use series capacitance inductance resistance shunt capacitance 60. When a pure semiconductor is heated,its resistance ………….. Goes up Goes down Remains the same Can’t say 61. An n-type semiconductor is……… Negatively charged Electrically neutral Positively charged None of the above 62. Which of the following personalities gave ‘The Laws of Heredity’? William Harvey G.J. Mendel Robert Hook Charles Darwin 63. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. None of theabove Decreases Remains the same Increases 64. A woofer should be fed from the input through a low pass filter high pass filter band pass filter band stop filter 65. A modem is classified as low speed if data rate handled is upto 250 bps upto 400 bps upto 100 bps upto 600 bps 66. Which of the following does not cause losses in optical fiber cables? Stepped index operation Micro bending Impurities Attenuation in glass 67. Which of the following devices are commonly used as error detectors in instruments ? Resolvers Microsyns Any of the above Vernistats 68. Addition of pentavalent impurity to a semiconductor creates many…….. Bound electrons Holes Valence electrons Free electrons 69. A signal g(t) = A then g(t) is a power signal neither energy nor power signal energy signal insucient data 70. Which of the following statements is not necessarily correct for open control system ? Generally free from problems of non-linearities Less expensive Input command is the sole factor responsible for providing the control action Presence of non-linearities causes malfunctioning 71. In Modulation, “carrier” is voltage with constant frequency, phase or amplitude resultant wave speech voltage to be transmitted voltage for which frequency, phase or amplitude is varied 72. 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 73. Which type of system response to its input represents the zero value of its initial condition? Zero input response Zero state response Natural response Total response 74. In open loop system the control action depends on the size of the system the control action depends on the input signal the control action is independent of the output the control action depends on system variables 75. Calculate 27% of 340. 88.8 91.8 12.6 81.0 76. A semiconductor is formed by……… bonds. Co-ordinate Electrovalent None of the above Covalent 77. 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 Shifting Time Scaling Duality 78. Who is known as “The Saint of Gutters”? Baba Amte Mother Teresa Anna Hazare None of these 79. 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 80. Positive logic in a logic circuit is one in which logicvoltage level is lower than logic1 voltage level logic0 and,-1 are represented by negative and positive voltages respectively logic0 and 1 are represented by 0and positive voltage respectively logic 0 voltage level is higher than logic 1 voltage level 81. Addition of trivalent impurity to a semiconductor creates many…….. Bound electrons Valence electrons Holes Free electrons 82. The resistivity of pure germanium under standard conditionsis about………. 6x104 Ocm 60 Ocm 3x106 Ocm 6x10-4 Ocm 83. Any externally introduced signal affecting the controlled output is called a stimulus signal feedback gain control 84. Which of the following ratios is equivalent to the ratio 25:300 ? 17:5 15:4 1:12 15:1 85. 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 86. A semiconductor has generally……………… valence electrons. 3 6 4 2 87. 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 number of poles to the loop transfer function should be increased The gain of the system should be increased The gain of the system should be decreased 88. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Multiplication Operation Folding Operation Integration Operation Shifting Operation 89. Name the person who was also known as Deshbandhu. Madan Mohan Malviya S. Radhakrishnan Chittaranjan Das G.K. Gokhale 90. 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 unit step function a shifted step function originating at t = a a step function 91. Complex numbers are used in AC circuit analysis primarily to represent: Bandwidth and harmonic content Power Amplitude and phase shift Frequency 92. The colour of an object is decided by the reflected colour the wavelength transmitted through it reflected colour for opaque object and wavelength transmitted through it for transparent objects none of the above 93. Factor the following polynomial expression: x2 −x−12 (x + 1)(x−12) (x + 3)(x−4) (x + 2)(x−6) (x + 4)(x−3) 94. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Zero initial condition Zero nal condition Non-zero nal condition Non-zero initial condition 95. All causal systems must have the component of stability time invariance linearity memory 96. A semiconductor has………… temperature coefficient of resistance. Negative Zero None of the above Positive 97. 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 98. Double integration of a unit step function would lead to a ramp a parabola an impulse a doublet 99. Convert an angle of 75 degrees into radians: 1.571 radians 1.309 radians 1.178 radians 0.7854 radians 100. A control system working under unknown random actions is called stochastic control system computer control system digital data system adaptive control system Time's up
