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 4, 2026 1. VSB modulation is preferred in TV because none of the above it reduces the bandwidth requirement to half it results in better reception it avoids phase distortion at low frequencies 2. Commercial Frequency deviation of FM is 65 kHz 75 kHz 80 kHz 70 kHz 3. A hole in a semiconductor is defined as……………. A free electron free neutron A free proton The incomplete part of an electron pair bond 4. Which of the following is an indirect way of generating FM? Reactance bipolar transistor Varactor diode modulator Armstrong modulator Reactance FET modulator 5. When a pentavalent impurity is added to a pure semiconductor,it becomes…… An intrinsic semiconductor p-type semiconductor n-type semiconductor An insulator 6. When a pure semiconductor is heated,its resistance ………….. Can’t say Goes down Goes up Remains the same 7. A signal g(t) = A then g(t) is a neither energy nor power signal power signal energy signal insucient data 8. Manipulate the following equation to solve for x: a = √bx2 x = √ab x = a2/b x =(a/b) 2 x = a/√b 9. A car is running at a constant speed of 50 km/h, which of the following is the feedback element for the driver ? Steering wheel Needle of the speedometer Clutch Eyes 10. Circular polarization is useful in discrimination between reception of adjacent beams is useful in reducing depolarization effect on received wave none of the above involves critical alignment of transmitting and receiving antenna 11. The resistivity of a pure silicon is about…………… 6000Ocm 6x10-8Ocm 3x105Om 100Ocm 12. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. None of theabove Remains the same Increases Decreases 13. Addition of pentavalent impurity to a semiconductor creates many…….. Free electrons Valence electrons Bound electrons Holes 14. Calculate 27% of 340. 81.0 91.8 88.8 12.6 15. In an open loop control system Only system parameters have effect on the control output Output is dependent on control input Output is independent of control input None of the above 16. A semiconductor has generally……………… valence electrons. 4 6 3 2 17. Themost commonlyused semiconductoris……….. Germanium Silicon Sulphur Carbon 18. For telegraphy the most commonly used modulation system is PCM FSK two tone modulation single tone modulation 19. .... is a part of the human temperature control system. Leg movement Digestive system Perspiration system Ear 20. Which of the following should be done to make an unstable system stable ? The number of zeros to the loop transfer function should be increased 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 21. A system which is linear is said to obey the rules of homogeneity additivity both scaling and additivity scaling 22. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Africa Europe Asia Australia 23. The resistivity of pure germanium under standard conditionsis about………. 60 Ocm 3x106 Ocm 6x104 Ocm 6x10-4 Ocm 24. 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 step function unit step function a shifted step function originating at t = a 25. A good control system has all the following features except sufficient power handling capacity good stability good stability good accuracy 26. A semiconductor is formed by……… bonds. Covalent Co-ordinate None of the above Electrovalent 27. 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 28. Which of the following does not cause losses in optical fiber cables? Impurities Micro bending Attenuation in glass Stepped index operation 29. Which of the following is an open loop control system ? Ward leonard control Field controlled D.C. motor Metadyne Stroboscope 30. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Frequency Shifting Time Reversal Conjugation Time Shifting 31. Double integration of a unit step function would lead to an impulse a parabola a ramp a doublet 32. Complex numbers are used in AC circuit analysis primarily to represent: Amplitude and phase shift Power Frequency Bandwidth and harmonic content 33. A pentavalent impurity has……….Valence electrons 3 5 4 6 34. The initial response when tne output is not equal to input is called Dynamic response Either of the above Error response Transient response 35. All causal systems must have the component of stability memory linearity time invariance 36. The sine function is defined as ratio of side lengths, Opposite divided by adjacent Adjacent divided by hypotenuse Opposite divided by hypotenuse Hypotenuse divided by adjacent 37. In open loop system the control action depends on the input signal the control action depends on system variables the control action depends on the size of the system the control action is independent of the output 38. Which of the following ratios is equivalent to the ratio 25:300 ? 15:1 15:4 1:12 17:5 39. Positive logic in a logic circuit is one in which logic 0 voltage level is higher than logic 1 voltage level 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 40. Name the person who was also known as Deshbandhu. Madan Mohan Malviya S. Radhakrishnan Chittaranjan Das G.K. Gokhale 41. Which of the following devices are commonly used as error detectors in instruments ? Vernistats Microsyns Any of the above Resolvers 42. Reactance bipolar transistor the radiation is zero in all directions the radiation at right angles is zero the radiation at right angles is zero the radiation is maximum in all directions 43. Which type of system response to its input represents the zero value of its initial condition? Zero state response Zero input response Natural response Total response 44. 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 45. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Triangular Rectangular Semi-circular Trapezoidal 46. Has tendency to oscillate. Closed loop system Neither (a) nor (b) Both (a) and (b) Open loop system 47. Any externally introduced signal affecting the controlled output is called a gain control signal stimulus feedback 48. The strength of a semiconductor crystal comes from …….. Electron-pair bonds None of the above Forces between nuclei Forces between protons 49. A cordless telephone using separate frequencies for transmission in base and portable units is known as duplex arrangement half duplex arrangement neither (a) nor (b) either (a) or (b) 50. 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 an earlier time the output at the present depends on the input at the current time 51. Damped sinusoids are _____ sinusoid signals divided by growing exponentials sinusoid signals divided by decaying exponentials sinusoid signals multiplied by decaying exponentials sinusoid signals multiplied by growing exponentials 52. The Fourier series of an odd periodic function contains sine harmonics only cosine harmonics only even harmonics only odd harmonics only 53. A time invariant system is a system whose output remains same with a delay in input decreases with a delay in input increases with a delay in input vanishes with a delay in input 54. Grand Central Terminal, Park Avenue, New York is the world’s longest railway station largest railway station highest railway station None of the above 55. .... is a closed loop system. Car starter Direct current generator Electric switch Auto-pilot for an aircraft 56. A trivalent impurity has…..valence electrons 3 6 5 4 57. A woofer should be fed from the input through a low pass filter high pass filter band pass filter band stop filter 58. A modem is classified as low speed if data rate handled is upto 400 bps upto 100 bps upto 600 bps upto 250 bps 59. 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 60. Which crop is sown on the largest area in India? Rice Wheat Sugarcane Maize 61. As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes division by s in the s domain division by e-sT in the s domain multiplication by e-sT in the s domain multiplication by s in the s domain 62. A semiconductor has………… temperature coefficient of resistance. Positive Negative Zero None of the above 63. 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 64. Garampani sanctuary is located at Gangtok, Sikkim Junagarh, Gujarat Kohima, Nagaland Diphu, Assam 65. 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 66. 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 40 meters 17.32 meters 20.01 meters 67. A hole and electron in close proximity would tend to ………. Attract each other Have no effect on each other Repel each other None of the above 68. 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 69. In a semiconductor,current conduction is due to …….. Holes and free electrons Only holes None of the above Only free electrons 70. Who is known as “The Saint of Gutters”? Baba Amte None of these Mother Teresa Anna Hazare 71. The frequency range of 300 kHz to 3000 kHz is known as high frequency medium frequency very high frequency low frequency 72. An n-type semiconductor is……… Negatively charged Positively charged None of the above Electrically neutral 73. To eliminate ghosts in the picture twist the transmission line change the antenna orientation of location connect a booster use a longer transmission line 74. 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 75. 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 = 1 ; y = 2 x = 2 ; y = 1 76. 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 77. For a low level AM system, the amplifiers modulated stage must be harmonic devices class C amplifiers linear devices non-linear devices 78. Convert an angle of 75 degrees into radians: 1.178 radians 1.309 radians 1.571 radians 0.7854 radians 79. A control system working under unknown random actions is called stochastic control system digital data system computer control system adaptive control system 80. In closed loop control system, with positive value of feedback gain the overall gain of the system will be unaffected decrease any of the above increase 81. 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 82. Addition of trivalent impurity to a semiconductor creates many…….. Free electrons Bound electrons Holes Valence electrons 83. The random motion of holes and free electrons due to thermal agitation is called ………. Diffusion Ionisation None of the above Pressure 84. Which of the following statements is not necessarily correct for open control system ? Generally free from problems of non-linearities Presence of non-linearities causes malfunctioning Input command is the sole factor responsible for providing the control action Less expensive 85. For attenuation of high frequencies we should use inductance shunt capacitance resistance series capacitance 86. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 70.2 113 80.9 102.3 87. An automatic toaster is a ______ loop control system. closed any of the above open partially closed 88. Which of the following statements is correct? 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 Convex lens has negative focal power and concave lens have positive focal power 89. Which of the following national parks is not listed in a UNESCO World Heritage site? Keoladeo Sundarbans Kaziranga Kanha 90. Manipulate the following equation to solve for x: x = aby x = y/ab x = a/by x = ay/b 91. FFC stands for Foreign Finance Corporation Film Finance Corporation forest film company None of the above 92. What is the nature of Fourier representation of a discrete & aperiodic signal? Discrete & periodic Continuous & periodic Continuous & periodic Continuous & aperiodic 93. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 1 -3 3 2 94. Which of the following personalities gave ‘The Laws of Heredity’? Robert Hook Charles Darwin William Harvey G.J. Mendel 95. A closed loop system is distinguished from open loop system by which of the following ? Feedback Input pattern Servo mechanism Output pattern 96. Factor the following polynomial expression: x2 −x−12 (x + 3)(x−4) (x + 4)(x−3) (x + 2)(x−6) (x + 1)(x−12) 97. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Integration Operation Shifting Operation Multiplication Operation Folding Operation 98. By which of the following the control action is determined when a man walks along a path ? Hands Legs Brain Eyes 99. Which among the following belongs to the category of non-recursive systems? Causal FIR Systems Causal IIR Systems Non-causal FIR Systems Non-causal IIR Systems 100. In Modulation, “carrier” is resultant wave speech voltage to be transmitted voltage for which frequency, phase or amplitude is varied voltage with constant frequency, phase or amplitude Time's up
