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:-October 6, 2022 1. A system which is linear is said to obey the rules of scaling homogeneity both scaling and additivity additivity 2. Factor the following polynomial expression: x2 −x−12 (x + 2)(x−6) (x + 4)(x−3) (x + 3)(x−4) (x + 1)(x−12) 3. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & aperiodic Discrete & periodic Continuous & periodic Continuous & periodic 4. When a pure semiconductor is heated,its resistance ………….. Goes down Can’t say Goes up Remains the same 5. For attenuation of high frequencies we should use resistance series capacitance shunt capacitance inductance 6. Circular polarization is useful in reducing depolarization effect on received wave is useful in discrimination between reception of adjacent beams none of the above involves critical alignment of transmitting and receiving antenna 7. .... is a part of the human temperature control system. Leg movement Digestive system Perspiration system Ear 8. A hole and electron in close proximity would tend to ………. Attract each other Repel each other Have no effect on each other None of the above 9. Commercial Frequency deviation of FM is 75 kHz 65 kHz 80 kHz 70 kHz 10. When a pentavalent impurity is added to a pure semiconductor,it becomes…… p-type semiconductor An intrinsic semiconductor n-type semiconductor An insulator 11. Which of the following statements is correct? Convex lens has positive focal power and concave lens have negative focal power All lens have positive focal power Convex lens has negative focal power and concave lens have positive focal power All lens have negative focal power 12. The resistivity of pure germanium under standard conditionsis about………. 3x106 Ocm 6x10-4 Ocm 60 Ocm 6x104 Ocm 13. Which of the following is an open loop control system ? Metadyne Ward leonard control Stroboscope Field controlled D.C. motor 14. A trivalent impurity has…..valence electrons 3 5 4 6 15. The frequency range of 300 kHz to 3000 kHz is known as high frequency medium frequency low frequency very high frequency 16. VSB modulation is preferred in TV because it results in better reception it reduces the bandwidth requirement to half none of the above it avoids phase distortion at low frequencies 17. The resistivity of a pure silicon is about…………… 6000Ocm 100Ocm 6x10-8Ocm 3x105Om 18. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Semi-circular Triangular Trapezoidal Rectangular 19. Any externally introduced signal affecting the controlled output is called a stimulus feedback signal gain control 20. A cordless telephone using separate frequencies for transmission in base and portable units is known as duplex arrangement either (a) or (b) half duplex arrangement neither (a) nor (b) 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. 23.09 meters 17.32 meters 40 meters 20.01 meters 22. FFC stands for Film Finance Corporation Foreign Finance Corporation forest film company None of the above 23. Calculate 27% of 340. 88.8 12.6 81.0 91.8 24. Damped sinusoids are _____ sinusoid signals multiplied by decaying exponentials sinusoid signals divided by growing exponentials sinusoid signals multiplied by growing exponentials sinusoid signals divided by decaying exponentials 25. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 2 3 1 -3 26. 27. Convert an angle of 75 degrees into radians: 0.7854 radians 1.178 radians 1.309 radians 1.571 radians 28. In open loop system the control action depends on the size of the system the control action depends on system variables the control action depends on the input signal the control action is independent of the output 29. For telegraphy the most commonly used modulation system is single tone modulation PCM FSK two tone modulation 30. 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 frequency domain & shape of spectrum can be interchangeable Shape of signal in time domain & shape of spectrum can be interchangeable 31. Garampani sanctuary is located at Junagarh, Gujarat Diphu, Assam Kohima, Nagaland Gangtok, Sikkim 32. 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 Less expensive Presence of non-linearities causes malfunctioning Generally free from problems of non-linearities 33. The sine function is deﬁned as ratio of side lengths, Adjacent divided by hypotenuse Opposite divided by hypotenuse Opposite divided by adjacent Hypotenuse divided by adjacent 34. Which of the following ratios is equivalent to the ratio 25:300 ? 15:1 15:4 1:12 17:5 35. Which of the following devices are commonly used as error detectors in instruments ? Vernistats Microsyns Any of the above Resolvers 36. A hole in a semiconductor is defined as……………. A free electron The incomplete part of an electron pair bond free neutron A free proton 37. Which of the following is an indirect way of generating FM? Varactor diode modulator Reactance bipolar transistor Reactance FET modulator Armstrong modulator 38. In an open loop control system None of the above Output is independent of control input Output is dependent on control input Only system parameters have effect on the control output 39. The initial response when tne output is not equal to input is called Error response Either of the above Dynamic response Transient response 40. Which among the following belongs to the category of non-recursive systems? Non-causal IIR Systems Causal IIR Systems Non-causal FIR Systems Causal FIR Systems 41. A good control system has all the following features except good stability good stability good accuracy sufficient power handling capacity 42. A modem is classified as low speed if data rate handled is upto 100 bps upto 600 bps upto 400 bps upto 250 bps 43. Which of the following national parks is not listed in a UNESCO World Heritage site? Sundarbans Keoladeo Kaziranga Kanha 44. 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 a time instant in the future 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 45. A pentavalent impurity has……….Valence electrons 3 4 5 6 46. For open control system which of the following statements is incorrect ? Construction is simple and maintenance easy Recalibration is not required for maintaining the required quality of the output Less expensive Errors are caused by disturbances 47. A semiconductor has generally……………… valence electrons. 3 4 2 6 48. Which type of system response to its input represents the zero value of its initial condition? Total response Natural response Zero input response Zero state response 49. To eliminate ghosts in the picture change the antenna orientation of location connect a booster use a longer transmission line twist the transmission line 50. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Folding Operation Shifting Operation Multiplication Operation Integration Operation 51. Which of the following should be done to make an unstable system stable ? The gain of the system should be increased The gain of the system should be decreased The number of poles to the loop transfer function should be increased The number of zeros to the loop transfer function should be increased 52. Which crop is sown on the largest area in India? Sugarcane Wheat Rice Maize 53. Has tendency to oscillate. Open loop system Closed loop system Neither (a) nor (b) Both (a) and (b) 54. The Fourier series of an odd periodic function contains cosine harmonics only sine harmonics only odd harmonics only even harmonics only 55. Manipulate the following equation to solve for x: a = √bx2 x =(a/b) 2 x = a/√b x = a2/b x = √ab 56. The random motion of holes and free electrons due to thermal agitation is called ………. None of the above Pressure Ionisation Diffusion 57. 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 58. The impurity level in an extrinsic semiconductor is about…..of pure semiconductor. 10 atoms for 108 atoms 1 atom for 108 atoms 1 atom for 104 atoms 1 atom for 100 atoms 59. A signal g(t) = A then g(t) is a power signal energy signal neither energy nor power signal insucient data 60. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 80.9 113 70.2 102.3 61. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Time Shifting Frequency Shifting Time Reversal Conjugation 62. A semiconductor has………… temperature coefficient of resistance. Positive None of the above Negative Zero 63. A woofer should be fed from the input through a low pass filter high pass filter band pass filter band stop filter 64. 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 65. 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 s in the s domain division by e-sT in the s domain multiplication by e-sT in the s domain 66. Which property of fourier transform gives rise to an additional phase shift of -2? ftd for the generated time delay in the communication Time Shifting Duality Time Scaling Linearity 67. Grand Central Terminal, Park Avenue, New York is the world’s largest railway station None of the above highest railway station longest railway station 68. Reactance bipolar transistor the radiation at right angles is zero the radiation is maximum in all directions the radiation is zero in all directions the radiation at right angles is zero 69. An n-type semiconductor is……… Electrically neutral None of the above Positively charged Negatively charged 70. All causal systems must have the component of memory linearity time invariance stability 71. 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 none of the above the reflected colour 72. In Modulation, “carrier” is resultant wave voltage for which frequency, phase or amplitude is varied voltage with constant frequency, phase or amplitude speech voltage to be transmitted 73. Addition of pentavalent impurity to a semiconductor creates many…….. Valence electrons Bound electrons Holes Free electrons 74. An automatic toaster is a ______ loop control system. any of the above closed open partially closed 75. Name the person who was also known as Deshbandhu. Chittaranjan Das G.K. Gokhale Madan Mohan Malviya S. Radhakrishnan 76. Manipulate the following equation to solve for x: x = aby x = a/by x = y/ab x = ay/b 77. A control system working under unknown random actions is called stochastic control system digital data system computer control system adaptive control system 78. Who is known as “The Saint of Gutters”? None of these Mother Teresa Baba Amte Anna Hazare 79. In a semiconductor,current conduction is due to …….. None of the above Only holes Holes and free electrons Only free electrons 80. Double integration of a unit step function would lead to a parabola an impulse a ramp a doublet 81. 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 82. The strength of a semiconductor crystal comes from …….. Forces between protons Forces between nuclei None of the above Electron-pair bonds 83. Under which conditions does an initially relaxed system become unstable ? only if bounded input generates unbounded output only if unbounded input generates unbounded output only if unbounded input generates bounded output only if bounded input generates bounded output 84. Which of the following does not cause losses in optical fiber cables? Micro bending Impurities Attenuation in glass Stepped index operation 85. A semiconductor is formed by……… bonds. Co-ordinate Electrovalent None of the above Covalent 86. Addition of trivalent impurity to a semiconductor creates many…….. Valence electrons Bound electrons Holes Free electrons 87. A closed loop system is distinguished from open loop system by which of the following ? Output pattern Servo mechanism Input pattern Feedback 88. .... is a closed loop system. Auto-pilot for an aircraft Car starter Direct current generator Electric switch 89. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Africa Europe Australia Asia 90. A control system in which the control action is somehow dependent on the output is known as Semi closed loop system Open system None of the above Closed loop system 91. By which of the following the control action is determined when a man walks along a path ? Legs Hands Brain Eyes 92. In Pulse Code Modulation system quantising noise can be reduced by decreasing the number of standard levels suffers from the disadvantage of its incompatibly with TDM quantising noise can be overcome by companding large bandwidth is required 93. A car is running at a constant speed of 50 km/h, which of the following is the feedback element for the driver ? Clutch Eyes Needle of the speedometer Steering wheel 94. In closed loop control system, with positive value of feedback gain the overall gain of the system will decrease any of the above increase be unaffected 95. For a low level AM system, the amplifiers modulated stage must be non-linear devices linear devices harmonic devices class C amplifiers 96. Positive logic in a logic circuit is one in which 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 logic0 and,-1 are represented by negative and positive voltages respectively 97. A time invariant system is a system whose output decreases with a delay in input vanishes with a delay in input remains same with a delay in input increases with a delay in input 98. Complex numbers are used in AC circuit analysis primarily to represent: Frequency Amplitude and phase shift Power Bandwidth and harmonic content 99. Themost commonlyused semiconductoris……….. Carbon Silicon Sulphur Germanium 100. Which of the following personalities gave ‘The Laws of Heredity’? Charles Darwin Robert Hook William Harvey G.J. Mendel 101. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. None of theabove Remains the same Decreases Increases Time is Up! Time's up