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:-March 17, 2025 1. Damped sinusoids are _____ sinusoid signals divided by growing exponentials sinusoid signals multiplied by decaying exponentials sinusoid signals multiplied by growing exponentials sinusoid signals divided by decaying exponentials 2. 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 3. The Fourier series of an odd periodic function contains odd harmonics only sine harmonics only even harmonics only cosine harmonics only 4. In closed loop control system, with positive value of feedback gain the overall gain of the system will decrease be unaffected increase any of the above 5. .... is a part of the human temperature control system. Ear Leg movement Digestive system Perspiration system 6. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Africa Europe Asia Australia 7. Which of the following should be done to make an unstable system stable ? The gain of the system should be decreased The gain of the system should be increased The number of zeros to the loop transfer function should be increased The number of poles to the loop transfer function should be increased 8. To eliminate ghosts in the picture connect a booster change the antenna orientation of location twist the transmission line use a longer transmission line 9. Garampani sanctuary is located at Gangtok, Sikkim Kohima, Nagaland Junagarh, Gujarat Diphu, Assam 10. Manipulate the following equation to solve for x: x = aby x = ay/b x = y/ab x = a/by 11. Which of the following does not cause losses in optical fiber cables? Attenuation in glass Micro bending Stepped index operation Impurities 12. Grand Central Terminal, Park Avenue, New York is the world’s longest railway station highest railway station largest railway station None of the above 13. 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 14. Themost commonlyused semiconductoris……….. Sulphur Carbon Germanium Silicon 15. The initial response when tne output is not equal to input is called Error response Transient response Either of the above Dynamic response 16. 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 17. Which of the following devices are commonly used as error detectors in instruments ? Resolvers Microsyns Any of the above Vernistats 18. The frequency range of 300 kHz to 3000 kHz is known as medium frequency very high frequency low frequency high frequency 19. For open control system which of the following statements is incorrect ? Recalibration is not required for maintaining the required quality of the output Errors are caused by disturbances Less expensive Construction is simple and maintenance easy 20. FFC stands for Film Finance Corporation None of the above forest film company Foreign Finance Corporation 21. 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 22. 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 23. When a pentavalent impurity is added to a pure semiconductor,it becomes…… p-type semiconductor n-type semiconductor An intrinsic semiconductor An insulator 24. For attenuation of high frequencies we should use series capacitance inductance resistance shunt capacitance 25. A time invariant system is a system whose output increases with a delay in input decreases with a delay in input vanishes with a delay in input remains same with a delay in input 26. For telegraphy the most commonly used modulation system is PCM FSK single tone modulation two tone modulation 27. In an open loop control system Output is dependent on control input None of the above Output is independent of control input Only system parameters have effect on the control output 28. Commercial Frequency deviation of FM is 80 kHz 70 kHz 65 kHz 75 kHz 29. Addition of trivalent impurity to a semiconductor creates many…….. Bound electrons Holes Free electrons Valence electrons 30. In a semiconductor,current conduction is due to …….. None of the above Only holes Only free electrons Holes and free electrons 31. Reactance bipolar transistor the radiation is maximum in all directions the radiation is zero in all directions the radiation at right angles is zero the radiation at right angles is zero 32. 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 33. A closed loop system is distinguished from open loop system by which of the following ? Servo mechanism Feedback Output pattern Input pattern 34. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 1 atom for 104 atoms 10 atoms for 108 atoms 1 atom for 100 atoms 1 atom for 108 atoms 35. A control system in which the control action is somehow dependent on the output is known as Open system None of the above Semi closed loop system Closed loop system 36. Which of the following statements is correct? All lens have positive focal power All lens have negative focal power 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 37. Which of the following ratios is equivalent to the ratio 25:300 ? 1:12 15:4 15:1 17:5 38. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Multiplication Operation Shifting Operation Integration Operation Folding Operation 39. 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 40. For a low level AM system, the amplifiers modulated stage must be non-linear devices harmonic devices class C amplifiers linear devices 41. Which of the following personalities gave ‘The Laws of Heredity’? Robert Hook G.J. Mendel Charles Darwin William Harvey 42. An automatic toaster is a ______ loop control system. any of the above partially closed open closed 43. 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 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 the current time 44. A hole in a semiconductor is defined as……………. A free electron The incomplete part of an electron pair bond A free proton free neutron 45. 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 46. Has tendency to oscillate. Neither (a) nor (b) Both (a) and (b) Closed loop system Open loop system 47. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Conjugation Time Reversal Time Shifting Frequency Shifting 48. An n-type semiconductor is……… None of the above Negatively charged Positively charged Electrically neutral 49. Double integration of a unit step function would lead to an impulse a parabola a ramp a doublet 50. Factor the following polynomial expression: x2 −x−12 (x + 2)(x−6) (x + 4)(x−3) (x + 1)(x−12) (x + 3)(x−4) 51. The resistivity of pure germanium under standard conditionsis about………. 60 Ocm 6x104 Ocm 6x10-4 Ocm 3x106 Ocm 52. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. None of theabove Decreases Remains the same Increases 53. Manipulate the following equation to solve for x: a = √bx2 x = a/√b x =(a/b) 2 x = √ab x = a2/b 54. Circular polarization none of the above involves critical alignment of transmitting and receiving antenna is useful in reducing depolarization effect on received wave is useful in discrimination between reception of adjacent beams 55. 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 40 meters 20.01 meters 23.09 meters 56. A pentavalent impurity has……….Valence electrons 3 6 4 5 57. The strength of a semiconductor crystal comes from …….. Forces between nuclei None of the above Electron-pair bonds Forces between protons 58. The colour of an object is decided by reflected colour for opaque object and wavelength transmitted through it for transparent objects the wavelength transmitted through it the reflected colour none of the above 59. A cordless telephone using separate frequencies for transmission in base and portable units is known as either (a) or (b) duplex arrangement neither (a) nor (b) half duplex arrangement 60. A semiconductor has………… temperature coefficient of resistance. Positive None of the above Zero Negative 61. All causal systems must have the component of time invariance memory stability linearity 62. As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes multiplication by e-sT in the s domain division by e-sT in the s domain multiplication by s in the s domain division by s in the s domain 63. Any externally introduced signal affecting the controlled output is called a feedback signal stimulus gain control 64. A trivalent impurity has…..valence electrons 4 3 5 6 65. 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 66. A semiconductor has generally……………… valence electrons. 6 4 2 3 67. The resistivity of a pure silicon is about…………… 6x10-8Ocm 3x105Om 100Ocm 6000Ocm 68. A modem is classified as low speed if data rate handled is upto 250 bps upto 100 bps upto 600 bps upto 400 bps 69. If output power of a radio receiver is doubled, its volume is increased by __________ dB. -3 1 2 3 70. Complex numbers are used in AC circuit analysis primarily to represent: Frequency Power Amplitude and phase shift Bandwidth and harmonic content 71. A system which is linear is said to obey the rules of homogeneity both scaling and additivity additivity scaling 72. A hole and electron in close proximity would tend to ………. None of the above Attract each other Have no effect on each other Repel each other 73. A signal g(t) = A then g(t) is a power signal neither energy nor power signal insucient data energy signal 74. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Triangular Rectangular Semi-circular Trapezoidal 75. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & periodic Continuous & periodic Discrete & periodic Continuous & aperiodic 76. 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 77. Which of the following national parks is not listed in a UNESCO World Heritage site? Keoladeo Kanha Kaziranga Sundarbans 78. Which among the following belongs to the category of non-recursive systems? Causal IIR Systems Non-causal FIR Systems Non-causal IIR Systems Causal FIR Systems 79. In open loop system the control action depends on the input signal the control action is independent of the output the control action depends on system variables the control action depends on the size of the system 80. The random motion of holes and free electrons due to thermal agitation is called ………. Ionisation Pressure Diffusion None of the above 81. A control system working under unknown random actions is called digital data system stochastic control system computer control system adaptive control system 82. Who is known as “The Saint of Gutters”? Anna Hazare None of these Baba Amte Mother Teresa 83. .... is a closed loop system. Auto-pilot for an aircraft Direct current generator Electric switch Car starter 84. When a pure semiconductor is heated,its resistance ………….. Remains the same Goes up Goes down Can’t say 85. Convert an angle of 75 degrees into radians: 1.571 radians 0.7854 radians 1.178 radians 1.309 radians 86. Name the person who was also known as Deshbandhu. S. Radhakrishnan Madan Mohan Malviya Chittaranjan Das G.K. Gokhale 87. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 113 102.3 70.2 80.9 88. Calculate 27% of 340. 91.8 88.8 81.0 12.6 89. Which of the following is an open loop control system ? Field controlled D.C. motor Stroboscope Metadyne Ward leonard control 90. Addition of pentavalent impurity to a semiconductor creates many…….. Valence electrons Free electrons Bound electrons Holes 91. By which of the following the control action is determined when a man walks along a path ? Brain Eyes Legs Hands 92. A good control system has all the following features except good stability good accuracy good stability sufficient power handling capacity 93. A woofer should be fed from the input through a band pass filter band stop filter high pass filter low pass filter 94. 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 95. Which crop is sown on the largest area in India? Rice Wheat Sugarcane Maize 96. 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 Eyes Steering wheel Clutch 97. A semiconductor is formed by……… bonds. Electrovalent Covalent Co-ordinate None of the above 98. Which type of system response to its input represents the zero value of its initial condition? Zero input response Total response Natural response Zero state response 99. Which of the following statements is not necessarily correct for open control system ? Less expensive Input command is the sole factor responsible for providing the control action Presence of non-linearities causes malfunctioning Generally free from problems of non-linearities 100. Which of the following is an indirect way of generating FM? Varactor diode modulator Reactance FET modulator Reactance bipolar transistor Armstrong modulator Time's up
