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:-July 27, 2024 1. Garampani sanctuary is located at Diphu, Assam Junagarh, Gujarat Gangtok, Sikkim Kohima, Nagaland 2. Commercial Frequency deviation of FM is 70 kHz 75 kHz 80 kHz 65 kHz 3. 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 4. Which crop is sown on the largest area in India? Rice Maize Wheat Sugarcane 5. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Asia Africa Europe Australia 6. 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 7. A control system in which the control action is somehow dependent on the output is known as None of the above Closed loop system Semi closed loop system Open system 8. Themost commonlyused semiconductoris……….. Germanium Carbon Silicon Sulphur 9. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 1 atom for 108 atoms 1 atom for 104 atoms 1 atom for 100 atoms 10 atoms for 108 atoms 10. In Pulse Code Modulation system large bandwidth is required quantising noise can be overcome by companding suffers from the disadvantage of its incompatibly with TDM quantising noise can be reduced by decreasing the number of standard levels 11. All causal systems must have the component of memory time invariance stability linearity 12. Any externally introduced signal affecting the controlled output is called a stimulus gain control feedback signal 13. A control system working under unknown random actions is called digital data system adaptive control system stochastic control system computer control system 14. Double integration of a unit step function would lead to a doublet a parabola an impulse a ramp 15. A semiconductor has generally……………… valence electrons. 2 3 4 6 16. A semiconductor is formed by……… bonds. None of the above Electrovalent Co-ordinate Covalent 17. The frequency range of 300 kHz to 3000 kHz is known as high frequency very high frequency low frequency medium frequency 18. Addition of pentavalent impurity to a semiconductor creates many…….. Holes Free electrons Bound electrons Valence electrons 19. 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 Generally free from problems of non-linearities Less expensive 20. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 2 1 3 -3 21. 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 17.32 meters 23.09 meters 20.01 meters 22. For a low level AM system, the amplifiers modulated stage must be class C amplifiers non-linear devices harmonic devices linear devices 23. 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 24. A pentavalent impurity has……….Valence electrons 4 6 3 5 25. Has tendency to oscillate. Open loop system Both (a) and (b) Neither (a) nor (b) Closed loop system 26. A system which is linear is said to obey the rules of scaling additivity both scaling and additivity homogeneity 27. 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 Duality Time Scaling 28. The resistivity of a pure silicon is about…………… 3x105Om 6000Ocm 100Ocm 6x10-8Ocm 29. In closed loop control system, with positive value of feedback gain the overall gain of the system will any of the above be unaffected decrease increase 30. Which of the following does not cause losses in optical fiber cables? Stepped index operation Attenuation in glass Impurities Micro bending 31. .... is a part of the human temperature control system. Perspiration system Leg movement Ear Digestive system 32. 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 does not depend on the factor of time at all the output at the present depends on the input at the current time 33. Which of the following devices are commonly used as error detectors in instruments ? Vernistats Any of the above Resolvers Microsyns 34. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Frequency Shifting Time Reversal Conjugation Time Shifting 35. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & aperiodic Continuous & periodic Continuous & periodic Discrete & periodic 36. The initial response when tne output is not equal to input is called Error response Transient response Dynamic response Either of the above 37. Which of the following national parks is not listed in a UNESCO World Heritage site? Kaziranga Sundarbans Keoladeo Kanha 38. When a pure semiconductor is heated,its resistance ………….. Goes down Remains the same Can’t say Goes up 39. Which of the following is an indirect way of generating FM? Reactance FET modulator Varactor diode modulator Reactance bipolar transistor Armstrong modulator 40. A woofer should be fed from the input through a low pass filter band pass filter band stop filter high pass filter 41. A hole and electron in close proximity would tend to ………. Have no effect on each other Attract each other Repel each other None of the above 42. Which of the following should be done to make an unstable system stable ? The gain of the system should be increased The number of poles to the loop transfer function should be increased The number of zeros to the loop transfer function should be increased The gain of the system should be decreased 43. Grand Central Terminal, Park Avenue, New York is the world’s longest railway station None of the above largest railway station highest railway station 44. A time invariant system is a system whose output increases with a delay in input remains same with a delay in input vanishes with a delay in input decreases with a delay in input 45. The resistivity of pure germanium under standard conditionsis about………. 3x106 Ocm 6x104 Ocm 6x10-4 Ocm 60 Ocm 46. Which of the following ratios is equivalent to the ratio 25:300 ? 15:1 1:12 15:4 17:5 47. The random motion of holes and free electrons due to thermal agitation is called ………. None of the above Diffusion Pressure Ionisation 48. Factor the following polynomial expression: x2 −x−12 (x + 3)(x−4) (x + 4)(x−3) (x + 1)(x−12) (x + 2)(x−6) 49. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Non-zero initial condition Zero initial condition Zero nal condition Non-zero nal condition 50. Which type of system response to its input represents the zero value of its initial condition? Natural response Zero state response Total response Zero input response 51. By which of the following the control action is determined when a man walks along a path ? Brain Eyes Hands Legs 52. An n-type semiconductor is……… Positively charged Electrically neutral Negatively charged None of the above 53. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. Increases Remains the same None of theabove Decreases 54. In Modulation, “carrier” is resultant wave voltage with constant frequency, phase or amplitude voltage for which frequency, phase or amplitude is varied speech voltage to be transmitted 55. A modem is classified as low speed if data rate handled is upto 600 bps upto 400 bps upto 250 bps upto 100 bps 56. Positive logic in a logic circuit is one in which logic0 and,-1 are represented by negative and positive voltages respectively logic0 and 1 are represented by 0and positive voltage respectively logicvoltage level is lower than logic1 voltage level logic 0 voltage level is higher than logic 1 voltage level 57. In open loop system the control action depends on the input signal the control action depends on system variables the control action is independent of the output the control action depends on the size of the system 58. The colour of an object is decided by the wavelength transmitted through it the reflected colour reflected colour for opaque object and wavelength transmitted through it for transparent objects none of the above 59. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Folding Operation Multiplication Operation Integration Operation Shifting Operation 60. Name the person who was also known as Deshbandhu. Chittaranjan Das S. Radhakrishnan Madan Mohan Malviya G.K. Gokhale 61. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 102.3 113 70.2 80.9 62. Which of the following statements is correct? Convex lens has positive focal power and concave lens have negative focal power Convex lens has negative focal power and concave lens have positive focal power All lens have negative focal power All lens have positive focal power 63. The strength of a semiconductor crystal comes from …….. None of the above Forces between protons Electron-pair bonds Forces between nuclei 64. A semiconductor has………… temperature coefficient of resistance. Positive Negative None of the above Zero 65. Who is known as “The Saint of Gutters”? None of these Anna Hazare Mother Teresa Baba Amte 66. VSB modulation is preferred in TV because none of the above it avoids phase distortion at low frequencies it reduces the bandwidth requirement to half it results in better reception 67. Which among the following belongs to the category of non-recursive systems? Causal IIR Systems Non-causal IIR Systems Causal FIR Systems Non-causal FIR Systems 68. Which of the following personalities gave ‘The Laws of Heredity’? Robert Hook Charles Darwin William Harvey G.J. Mendel 69. A car is running at a constant speed of 50 km/h, which of the following is the feedback element for the driver ? Eyes Clutch Steering wheel Needle of the speedometer 70. 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 step function a shifted step function originating at t = a 71. 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 Construction is simple and maintenance easy Errors are caused by disturbances 72. A closed loop system is distinguished from open loop system by which of the following ? Input pattern Output pattern Feedback Servo mechanism 73. 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 division by s in the s domain multiplication by e-sT in the s domain 74. The Fourier series of an odd periodic function contains cosine harmonics only odd harmonics only sine harmonics only even harmonics only 75. An automatic toaster is a ______ loop control system. any of the above closed open partially closed 76. A trivalent impurity has…..valence electrons 4 3 5 6 77. When a pentavalent impurity is added to a pure semiconductor,it becomes…… n-type semiconductor An insulator p-type semiconductor An intrinsic semiconductor 78. Duality Theorem / Property of Fourier Transform states that _________ Shape of signal in frequency domain & shape of spectrum can be interchangeable 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 79. Manipulate the following equation to solve for x: a = √bx2 x = √ab x =(a/b) 2 x = a/√b x = a2/b 80. In a semiconductor,current conduction is due to …….. None of the above Only holes Holes and free electrons Only free electrons 81. Complex numbers are used in AC circuit analysis primarily to represent: Power Frequency Bandwidth and harmonic content Amplitude and phase shift 82. Damped sinusoids are _____ sinusoid signals divided by decaying exponentials sinusoid signals multiplied by growing exponentials sinusoid signals multiplied by decaying exponentials sinusoid signals divided by growing exponentials 83. Manipulate the following equation to solve for x: x = a/by x = y/ab x = ay/b x = aby 84. For attenuation of high frequencies we should use inductance shunt capacitance resistance series capacitance 85. Circular polarization none of the above 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 86. Which of the following is an open loop control system ? Field controlled D.C. motor Metadyne Ward leonard control Stroboscope 87. A cordless telephone using separate frequencies for transmission in base and portable units is known as half duplex arrangement neither (a) nor (b) either (a) or (b) duplex arrangement 88. A hole in a semiconductor is defined as……………. A free electron free neutron The incomplete part of an electron pair bond A free proton 89. A signal g(t) = A then g(t) is a energy signal insucient data power signal neither energy nor power signal 90. Calculate 27% of 340. 81.0 88.8 91.8 12.6 91. To eliminate ghosts in the picture connect a booster twist the transmission line change the antenna orientation of location use a longer transmission line 92. 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 93. Addition of trivalent impurity to a semiconductor creates many…….. Bound electrons Valence electrons Holes Free electrons 94. Convert an angle of 75 degrees into radians: 1.178 radians 0.7854 radians 1.571 radians 1.309 radians 95. .... is a closed loop system. Electric switch Car starter Auto-pilot for an aircraft Direct current generator 96. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Semi-circular Triangular Rectangular Trapezoidal 97. FFC stands for forest film company Foreign Finance Corporation Film Finance Corporation None of the above 98. For telegraphy the most commonly used modulation system is two tone modulation PCM FSK single tone modulation 99. 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 100. A good control system has all the following features except sufficient power handling capacity good stability good stability good accuracy Time's up