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:-February 5, 2023 1. Which of the following ratios is equivalent to the ratio 25:300 ? 1:12 15:4 17:5 15:1 2. If output power of a radio receiver is doubled, its volume is increased by __________ dB. -3 1 2 3 3. Complex numbers are used in AC circuit analysis primarily to represent: Amplitude and phase shift Bandwidth and harmonic content Power Frequency 4. 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 5. Who is known as “The Saint of Gutters”? None of these Mother Teresa Baba Amte Anna Hazare 6. 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 Steering wheel Clutch Eyes 7. In an open loop control system Output is independent of control input Output is dependent on control input Only system parameters have effect on the control output None of the above 8. A trivalent impurity has…..valence electrons 4 3 5 6 9. A system which is linear is said to obey the rules of homogeneity scaling both scaling and additivity additivity 10. A signal g(t) = A then g(t) is a energy signal neither energy nor power signal insucient data power signal 11. Garampani sanctuary is located at Diphu, Assam Gangtok, Sikkim Junagarh, Gujarat Kohima, Nagaland 12. When a pure semiconductor is heated,its resistance ………….. Goes up Goes down Can’t say Remains the same 13. Grand Central Terminal, Park Avenue, New York is the world’s None of the above largest railway station highest railway station longest railway station 14. Under which conditions does an initially relaxed system become unstable ? only if unbounded input generates bounded output only if bounded input generates bounded output only if unbounded input generates unbounded output only if bounded input generates unbounded output 15. Addition of pentavalent impurity to a semiconductor creates many…….. Bound electrons Holes Valence electrons Free electrons 16. An n-type semiconductor is……… Electrically neutral None of the above Positively charged Negatively charged 17. In Modulation, “carrier” is speech voltage to be transmitted voltage for which frequency, phase or amplitude is varied resultant wave voltage with constant frequency, phase or amplitude 18. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. Remains the same Increases None of theabove Decreases 19. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Semi-circular Trapezoidal Rectangular Triangular 20. A control system in which the control action is somehow dependent on the output is known as Open system Semi closed loop system None of the above Closed loop system 21. .... is a closed loop system. Electric switch Direct current generator Auto-pilot for an aircraft Car starter 22. Which of the following does not cause losses in optical fiber cables? Attenuation in glass Micro bending Stepped index operation Impurities 23. Addition of trivalent impurity to a semiconductor creates many…….. Bound electrons Valence electrons Free electrons Holes 24. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Time Reversal Frequency Shifting Conjugation Time Shifting 25. The frequency range of 300 kHz to 3000 kHz is known as low frequency high frequency medium frequency very high frequency 26. The initial response when tne output is not equal to input is called Dynamic response Either of the above Error response Transient response 27. Calculate 27% of 340. 88.8 91.8 12.6 81.0 28. In closed loop control system, with positive value of feedback gain the overall gain of the system will increase decrease any of the above be unaffected 29. 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. 20.01 meters 23.09 meters 40 meters 17.32 meters 30. 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 31. As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes division by s in the s domain multiplication by e-sT in the s domain multiplication by s in the s domain division by e-sT in the s domain 32. The colour of an object is decided by the reflected colour reflected colour for opaque object and wavelength transmitted through it for transparent objects none of the above the wavelength transmitted through it 33. In Pulse Code Modulation system quantising noise can be overcome by companding suffers from the disadvantage of its incompatibly with TDM large bandwidth is required quantising noise can be reduced by decreasing the number of standard levels 34. 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 35. For telegraphy the most commonly used modulation system is single tone modulation PCM FSK two tone modulation 36. 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 37. Which of the following statements is correct? Convex lens has negative focal power and concave lens have positive focal power All lens have positive focal power Convex lens has positive focal power and concave lens have negative focal power All lens have negative focal power 38. A cordless telephone using separate frequencies for transmission in base and portable units is known as duplex arrangement either (a) or (b) neither (a) nor (b) half duplex arrangement 39. Which of the following devices are commonly used as error detectors in instruments ? Microsyns Vernistats Any of the above Resolvers 40. Which crop is sown on the largest area in India? Sugarcane Rice Maize Wheat 41. Any externally introduced signal affecting the controlled output is called a feedback gain control signal stimulus 42. 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 43. A semiconductor is formed by……… bonds. Co-ordinate Covalent Electrovalent None of the above 44. Unilateral Laplace Transform is applicable for the determination of linear constant coecient dierential equations with ________ Zero nal condition Zero initial condition Non-zero nal condition Non-zero initial condition 45. The sine function is defined as ratio of side lengths, Hypotenuse divided by adjacent Adjacent divided by hypotenuse Opposite divided by adjacent Opposite divided by hypotenuse 46. VSB modulation is preferred in TV because it reduces the bandwidth requirement to half it avoids phase distortion at low frequencies it results in better reception none of the above 47. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 1 atom for 100 atoms 10 atoms for 108 atoms 1 atom for 104 atoms 1 atom for 108 atoms 48. 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 Construction is simple and maintenance easy Less expensive 49. Which of the following is an indirect way of generating FM? Reactance bipolar transistor Reactance FET modulator Varactor diode modulator Armstrong modulator 50. For attenuation of high frequencies we should use shunt capacitance series capacitance inductance resistance 51. A control system working under unknown random actions is called computer control system stochastic control system digital data system adaptive control system 52. Which of the following national parks is not listed in a UNESCO World Heritage site? Keoladeo Kaziranga Kanha Sundarbans 53. Has tendency to oscillate. Neither (a) nor (b) Closed loop system Both (a) and (b) Open loop system 54. Convert an angle of 75 degrees into radians: 1.309 radians 1.571 radians 1.178 radians 0.7854 radians 55. A hole and electron in close proximity would tend to ………. Attract each other Have no effect on each other None of the above Repel each other 56. When a pentavalent impurity is added to a pure semiconductor,it becomes…… n-type semiconductor p-type semiconductor An intrinsic semiconductor An insulator 57. Themost commonlyused semiconductoris……….. Carbon Sulphur Germanium Silicon 58. 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 59. A system is said to be dened as non causal, when 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 the output at the present depends on the input at an earlier time 60. By which of the following the control action is determined when a man walks along a path ? Eyes Brain Hands Legs 61. To eliminate ghosts in the picture connect a booster twist the transmission line use a longer transmission line change the antenna orientation of location 62. 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 63. 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 64. 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 shifted step function originating at t = a unit step function a pulse function a step function 65. Which property of fourier transform gives rise to an additional phase shift of -2? ftd for the generated time delay in the communication Time Scaling Duality Linearity Time Shifting 66. Factor the following polynomial expression: x2 −x−12 (x + 2)(x−6) (x + 1)(x−12) (x + 3)(x−4) (x + 4)(x−3) 67. A modem is classified as low speed if data rate handled is upto 600 bps upto 250 bps upto 100 bps upto 400 bps 68. The Fourier series of an odd periodic function contains sine harmonics only odd harmonics only cosine harmonics only even harmonics only 69. .... is a part of the human temperature control system. Ear Leg movement Digestive system Perspiration system 70. In a semiconductor,current conduction is due to …….. Only free electrons None of the above Holes and free electrons Only holes 71. A pentavalent impurity has……….Valence electrons 6 5 3 4 72. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & aperiodic Continuous & periodic Discrete & periodic Continuous & periodic 73. All causal systems must have the component of stability linearity memory time invariance 74. Manipulate the following equation to solve for x: x = ay/b x = aby x = y/ab x = a/by 75. 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 Presence of non-linearities causes malfunctioning Generally free from problems of non-linearities Less expensive 76. Commercial Frequency deviation of FM is 80 kHz 75 kHz 65 kHz 70 kHz 77. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Europe Australia Asia Africa 78. A woofer should be fed from the input through a low pass filter band stop filter high pass filter band pass filter 79. Name the person who was also known as Deshbandhu. G.K. Gokhale S. Radhakrishnan Madan Mohan Malviya Chittaranjan Das 80. 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 81. Reactance bipolar transistor the radiation at right angles is zero the radiation at right angles is zero the radiation is zero in all directions the radiation is maximum in all directions 82. The resistivity of pure germanium under standard conditionsis about………. 3x106 Ocm 6x10-4 Ocm 6x104 Ocm 60 Ocm 83. The strength of a semiconductor crystal comes from …….. None of the above Electron-pair bonds Forces between nuclei Forces between protons 84. A closed loop system is distinguished from open loop system by which of the following ? Servo mechanism Input pattern Feedback Output pattern 85. Which of the following personalities gave ‘The Laws of Heredity’? G.J. Mendel William Harvey Charles Darwin Robert Hook 86. For a low level AM system, the amplifiers modulated stage must be harmonic devices non-linear devices class C amplifiers linear devices 87. A semiconductor has………… temperature coefficient of resistance. Positive None of the above Negative Zero 88. A good control system has all the following features except good stability good accuracy good stability sufficient power handling capacity 89. 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 90. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Shifting Operation Folding Operation Integration Operation Multiplication Operation 91. Manipulate the following equation to solve for x: a = √bx2 x =(a/b) 2 x = a/√b x = √ab x = a2/b 92. The random motion of holes and free electrons due to thermal agitation is called ………. Pressure None of the above Ionisation Diffusion 93. An automatic toaster is a ______ loop control system. closed any of the above open partially closed 94. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 70.2 80.9 113 102.3 95. A hole in a semiconductor is defined as……………. A free proton The incomplete part of an electron pair bond A free electron free neutron 96. A semiconductor has generally……………… valence electrons. 2 6 4 3 97. FFC stands for Film Finance Corporation None of the above forest film company Foreign Finance Corporation 98. Double integration of a unit step function would lead to a parabola a ramp a doublet an impulse 99. The resistivity of a pure silicon is about…………… 100Ocm 6x10-8Ocm 3x105Om 6000Ocm 100. Which of the following is an open loop control system ? Ward leonard control Field controlled D.C. motor Stroboscope Metadyne Time is Up! Time's up
