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:-September 13, 2026 1. VSB modulation is preferred in TV because none of the above it results in better reception it reduces the bandwidth requirement to half it avoids phase distortion at low frequencies 2. A hole and electron in close proximity would tend to ………. Attract each other None of the above Have no effect on each other Repel each other 3. 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 4. A good control system has all the following features except good stability good stability good accuracy sufficient power handling capacity 5. Circular polarization none of the above is useful in discrimination between reception of adjacent beams is useful in reducing depolarization effect on received wave involves critical alignment of transmitting and receiving antenna 6. For attenuation of high frequencies we should use shunt capacitance series capacitance inductance resistance 7. Double integration of a unit step function would lead to a doublet a parabola a ramp an impulse 8. If output power of a radio receiver is doubled, its volume is increased by __________ dB. 3 -3 1 2 9. Which property of periodic signal in DTFS gets completely claried /identied by the equation x (n – n0 )? Frequency Shifting Conjugation Time Reversal Time Shifting 10. A modem is classified as low speed if data rate handled is upto 400 bps upto 600 bps upto 250 bps upto 100 bps 11. Positive logic in a logic circuit is one in which 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 logic0 and,-1 are represented by negative and positive voltages respectively 12. Which of the following ratios is equivalent to the ratio 25:300 ? 1:12 15:1 17:5 15:4 13. Which among the following operations is/are not involved /associated with the computation process of linear convolution? Folding Operation Multiplication Operation Shifting Operation Integration Operation 14. Garampani sanctuary is located at Junagarh, Gujarat Kohima, Nagaland Gangtok, Sikkim Diphu, Assam 15. Which of the following statements is not necessarily correct for open control system ? Presence of non-linearities causes malfunctioning Input command is the sole factor responsible for providing the control action Less expensive Generally free from problems of non-linearities 16. A pentavalent impurity has……….Valence electrons 6 4 3 5 17. A hole in a semiconductor is defined as……………. free neutron A free electron The incomplete part of an electron pair bond A free proton 18. Any externally introduced signal affecting the controlled output is called a signal gain control feedback stimulus 19. By which of the following the control action is determined when a man walks along a path ? Eyes Brain Legs Hands 20. The resistivity of a pure silicon is about…………… 3x105Om 6000Ocm 100Ocm 6x10-8Ocm 21. Which of the following devices are commonly used as error detectors in instruments ? Any of the above Microsyns Resolvers Vernistats 22. The colour of an object is decided by none of the above the wavelength transmitted through it the reflected colour reflected colour for opaque object and wavelength transmitted through it for transparent objects 23. 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 24. What is the nature of Fourier representation of a discrete & aperiodic signal? Continuous & periodic Continuous & periodic Continuous & aperiodic Discrete & periodic 25. Which among the following belongs to the category of non-recursive systems? Non-causal FIR Systems Non-causal IIR Systems Causal IIR Systems Causal FIR Systems 26. 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 27. An n-type semiconductor is……… None of the above Positively charged Negatively charged Electrically neutral 28. The initial response when tne output is not equal to input is called Either of the above Transient response Dynamic response Error response 29. 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 unit step function a shifted step function originating at t = a a pulse function a step function 30. A closed loop system is distinguished from open loop system by which of the following ? Output pattern Servo mechanism Input pattern Feedback 31. A signal g(t) = A then g(t) is a energy signal neither energy nor power signal insucient data power signal 32. In open loop system the control action depends on system variables the control action depends on the input signal the control action depends on the size of the system the control action is independent of the output 33. Complex numbers are used in AC circuit analysis primarily to represent: Power Amplitude and phase shift Frequency Bandwidth and harmonic content 34. Addition of trivalent impurity to a semiconductor creates many…….. Valence electrons Holes Free electrons Bound electrons 35. For a low level AM system, the amplifiers modulated stage must be class C amplifiers linear devices harmonic devices non-linear devices 36. In closed loop control system, with positive value of feedback gain the overall gain of the system will any of the above decrease be unaffected increase 37. .... is a part of the human temperature control system. Leg movement Perspiration system Ear Digestive system 38. Which of the following is an open loop control system ? Field controlled D.C. motor Metadyne Stroboscope Ward leonard control 39. A semiconductor has………… temperature coefficient of resistance. Positive Negative None of the above Zero 40. A trivalent impurity has…..valence electrons 3 5 6 4 41. 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 23.09 meters 20.01 meters 42. Calculate 27% of 340. 81.0 88.8 91.8 12.6 43. A time invariant system is a system whose output increases with a delay in input vanishes with a delay in input remains same with a delay in input decreases with a delay in input 44. .... is a closed loop system. Car starter Electric switch Direct current generator Auto-pilot for an aircraft 45. Which type of system response to its input represents the zero value of its initial condition? Total response Zero state response Zero input response Natural response 46. 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 increased The number of poles to the loop transfer function should be increased The gain of the system should be decreased 47. As the doping to a pure semiconductor increases,the bulk resistance of the semiconductor……….. None of theabove Decreases Increases Remains the same 48. When a pentavalent impurity is added to a pure semiconductor,it becomes…… An insulator p-type semiconductor n-type semiconductor An intrinsic semiconductor 49. Under which conditions does an initially relaxed system become unstable ? only if bounded input generates bounded output only if unbounded input generates unbounded output only if unbounded input generates bounded output only if bounded input generates unbounded output 50. Which of the following national parks is not listed in a UNESCO World Heritage site? Kanha Kaziranga Keoladeo Sundarbans 51. For telegraphy the most commonly used modulation system is single tone modulation two tone modulation FSK PCM 52. Commercial Frequency deviation of FM is 70 kHz 80 kHz 75 kHz 65 kHz 53. A semiconductor has generally……………… valence electrons. 6 2 4 3 54. 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 s in the s domain multiplication by e-sT in the s domain 55. Factor the following polynomial expression: x2 −x−12 (x + 3)(x−4) (x + 1)(x−12) (x + 4)(x−3) (x + 2)(x−6) 56. In an open loop control system None of the above Only system parameters have effect on the control output Output is independent of control input Output is dependent on control input 57. Has tendency to oscillate. Closed loop system Both (a) and (b) Neither (a) nor (b) Open loop system 58. To eliminate ghosts in the picture change the antenna orientation of location twist the transmission line connect a booster use a longer transmission line 59. 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 Clutch Steering wheel 60. 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 61. The Fourier series of an odd periodic function contains even harmonics only cosine harmonics only sine harmonics only odd harmonics only 62. A control system working under unknown random actions is called digital data system computer control system stochastic control system adaptive control system 63. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 80.9 70.2 113 102.3 64. 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 65. All causal systems must have the component of linearity time invariance memory stability 66. Convert an angle of 75 degrees into radians: 0.7854 radians 1.571 radians 1.178 radians 1.309 radians 67. Reactance bipolar transistor the radiation is zero in all directions the radiation at right angles is zero the radiation is maximum in all directions the radiation at right angles is zero 68. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform? Rectangular Triangular Semi-circular Trapezoidal 69. When a pure semiconductor is heated,its resistance ………….. Can’t say Goes up Remains the same Goes down 70. Damped sinusoids are _____ sinusoid signals multiplied by growing exponentials sinusoid signals divided by growing exponentials sinusoid signals multiplied by decaying exponentials sinusoid signals divided by decaying exponentials 71. A control system in which the control action is somehow dependent on the output is known as Open system Closed loop system Semi closed loop system None of the above 72. In Pulse Code Modulation system suffers from the disadvantage of its incompatibly with TDM quantising noise can be reduced by decreasing the number of standard levels large bandwidth is required quantising noise can be overcome by companding 73. The strength of a semiconductor crystal comes from …….. None of the above Forces between nuclei Forces between protons Electron-pair bonds 74. 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 75. The sine function is defined as ratio of side lengths, Opposite divided by adjacent Opposite divided by hypotenuse Hypotenuse divided by adjacent Adjacent divided by hypotenuse 76. A cordless telephone using separate frequencies for transmission in base and portable units is known as half duplex arrangement either (a) or (b) neither (a) nor (b) duplex arrangement 77. Grand Central Terminal, Park Avenue, New York is the world’s largest railway station longest railway station highest railway station None of the above 78. 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 79. Addition of pentavalent impurity to a semiconductor creates many…….. Free electrons Valence electrons Bound electrons Holes 80. Which of the following does not cause losses in optical fiber cables? Stepped index operation Micro bending Attenuation in glass Impurities 81. An automatic toaster is a ______ loop control system. open closed partially closed any of the above 82. In a semiconductor,current conduction is due to …….. Holes and free electrons Only holes None of the above Only free electrons 83. A semiconductor is formed by……… bonds. Electrovalent None of the above Covalent Co-ordinate 84. A system which is linear is said to obey the rules of scaling homogeneity both scaling and additivity additivity 85. The resistivity of pure germanium under standard conditionsis about………. 3x106 Ocm 6x10-4 Ocm 6x104 Ocm 60 Ocm 86. Manipulate the following equation to solve for x: a = √bx2 x = a2/b x = √ab x = a/√b x =(a/b) 2 87. FFC stands for forest film company Film Finance Corporation Foreign Finance Corporation None of the above 88. For open control system which of the following statements is incorrect ? Less expensive Construction is simple and maintenance easy Errors are caused by disturbances Recalibration is not required for maintaining the required quality of the output 89. A woofer should be fed from the input through a band stop filter high pass filter low pass filter band pass filter 90. Which crop is sown on the largest area in India? Sugarcane Rice Wheat Maize 91. Eritrea, which became the 182nd member of the United Nations in 1993, is on the continent of Asia Africa Australia Europe 92. Manipulate the following equation to solve for x: x = aby x = a/by x = ay/b x = y/ab 93. The frequency range of 300 kHz to 3000 kHz is known as high frequency low frequency medium frequency very high frequency 94. 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 95. Which of the following personalities gave ‘The Laws of Heredity’? William Harvey Charles Darwin Robert Hook G.J. Mendel 96. The random motion of holes and free electrons due to thermal agitation is called ………. Ionisation Pressure None of the above Diffusion 97. Which of the following is an indirect way of generating FM? Reactance FET modulator Armstrong modulator Varactor diode modulator Reactance bipolar transistor 98. Name the person who was also known as Deshbandhu. Chittaranjan Das G.K. Gokhale Madan Mohan Malviya S. Radhakrishnan 99. Themost commonlyused semiconductoris……….. Germanium Sulphur Silicon Carbon 100. Who is known as “The Saint of Gutters”? Baba Amte None of these Anna Hazare Mother Teresa Time's up
