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