MCQOPTIONS
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MCQOPTIONS
This section includes 100 Mcqs, each offering curated multiple-choice questions to sharpen your Graduate Aptitude Test (GATE) knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A psychometric chart is used to determine |
| A. | pH |
| B. | Sound velocity in glasses |
| C. | CO2 concentration |
| D. | Relative humidity |
| Answer» B. Sound velocity in glasses | |
| 52. |
The output Y of a 2-bit comparator is logic 1 whenever the 2-bit input A is greater than the 2-hit input B. The number of combinations for which the output is logic 1, is: |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 10 |
| Answer» C. 8 | |
| 53. |
The average power delivered to an impedance (4—j3) Ω by a current 5cos (100πt÷100) A is |
| A. | 44.2 W |
| B. | 50 W |
| C. | 62.5 W |
| D. | 125 W |
| Answer» C. 62.5 W | |
| 54. |
The resistance of LDR ________________ when exposed to radiant energy |
| A. | Remains unaltered |
| B. | Increases |
| C. | Reaches maximum |
| D. | Decreases |
| Answer» E. | |
| 55. |
Photo multiplier consists of |
| A. | 1 Photo emissive cathode & 2 dynodes |
| B. | 2 Photo emissive cathodes & 2 dynodes |
| C. | 2 Photo emissive cathodes & 1 dynode |
| D. | 1 Photo emissive cathode & 1 dynode |
| Answer» B. 2 Photo emissive cathodes & 2 dynodes | |
| 56. |
Fiber optic sensor can be used to sense _________ |
| A. | Displacement |
| B. | Power |
| C. | Current |
| D. | Resistance |
| Answer» B. Power | |
| 57. |
____________ fiber is used in interferometric instruments. |
| A. | Monomode |
| B. | Multimode |
| C. | Birefringent |
| D. | Coated |
| Answer» B. Multimode | |
| 58. |
In a graded index fiber, the total reflected light takes a ___________ |
| A. | Straight line path |
| B. | Parabolic path |
| C. | Elliptical path |
| D. | Circular path |
| Answer» C. Elliptical path | |
| 59. |
The capacitance microphone is used for the detection of |
| A. | Heart rate |
| B. | Blood flow |
| C. | Heart sound |
| D. | Foot pressure |
| Answer» D. Foot pressure | |
| 60. |
Silver chloride electrode is used as a reference electrode due to its |
| A. | Large half cell potential |
| B. | Stable half cell potential |
| C. | Stable resting potential |
| D. | Stable action potential |
| Answer» C. Stable resting potential | |
| 61. |
pH value of venous blood is |
| A. | 7.30 |
| B. | 7.40 |
| C. | 7.35 |
| D. | 7.45 |
| Answer» D. 7.45 | |
| 62. |
_____________ is the example of photo emissive cell |
| A. | LDR |
| B. | Photo diode |
| C. | Photo transistor |
| D. | Photo multiplier |
| Answer» B. Photo diode | |
| 63. |
Most commonly used indicator electrode is |
| A. | Calomel electrode |
| B. | Silver electrode |
| C. | Silver – Silver chloride electrode |
| D. | Glass electrode |
| Answer» E. | |
| 64. |
Test electrode is also known as |
| A. | Indicator electrode |
| B. | Reference electrode |
| C. | Second electrode |
| D. | Primary electrode |
| Answer» B. Reference electrode | |
| 65. |
S1: In multimode fiber optics, intensity modulating schemes can be employed. S2: Schemes using polarizing techniques need birefringent fiber. |
| A. | S1 is true and S2 is false |
| B. | Both S1 and S2 are true |
| C. | S1 is false and S2 is true |
| D. | Both S1 and S2 are false |
| Answer» C. S1 is false and S2 is true | |
| 66. |
Photo conductive cell consists of a thin film of |
| A. | Quartz |
| B. | Lithium sulphate |
| C. | Barium titanate |
| D. | Selenium |
| Answer» E. | |
| 67. |
In foil strain gauge the thickness of foil varies from |
| A. | 2.5 micron to 6 micron |
| B. | 25 micron (or) less |
| C. | 25 micron to 60 micron |
| D. | 2.5 micron to 5 micron |
| Answer» B. 25 micron (or) less | |
| 68. |
The change in resistance of a metal wire owing to strain is due to S1: Change in dimension of wire expressed by factor (1-2µ) S2: Change in resistance ?? |
| A. | S1 is true & S2 is false |
| B. | S2 is true & S1 is false |
| C. | Both S1 & S2 are true |
| D. | Both S1 & S2 are false |
| Answer» C. Both S1 & S2 are true | |
| 69. |
Pressure transducer for measuring blood pressure is |
| A. | Strain gauge transducer only |
| B. | Strain gauge or capacitive transducer |
| C. | Resistive transducer |
| D. | Fiber optic transducer |
| Answer» C. Resistive transducer | |
| 70. |
Venturi is associated with |
| A. | Venous blood pressure |
| B. | Digital plethysmography |
| C. | Dialysate flow in artificial kidney |
| D. | Blood flow in heart lung machine |
| Answer» E. | |
| 71. |
The application of LVDT is |
| A. | Joint motion |
| B. | Finger movement |
| C. | Limb movement |
| D. | Heart wall motion |
| Answer» D. Heart wall motion | |
| 72. |
The principle of operation of variable resistance transducer is |
| A. | Deformation leads to change in resistance |
| B. | Displacement of a contact slider on a resistance |
| C. | Coupling of two coils changes with displacement |
| D. | Movement of magnetic field produces variation in resistance of material |
| Answer» C. Coupling of two coils changes with displacement | |
| 73. |
The transducers which requires an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc., are called as |
| A. | Active transducer |
| B. | Primary sensor |
| C. | Passive transducer |
| D. | Self generating transducer |
| Answer» D. Self generating transducer | |
| 74. |
Pick the correct statement regarding functions of a transducer S1: Sense the magnitude, change in & / or frequency of same measurand S2: To provide electrical output that furnishes accurate, quantitative data about the measurand |
| A. | S1 is true & S2 is false |
| B. | S2 is true & S1 is false |
| C. | Both S1 & S2 are true |
| D. | Both S1 & S2 are false |
| Answer» D. Both S1 & S2 are false | |
| 75. |
Capacitive transducers are normally employed for___________ measurements |
| A. | Static |
| B. | Dynamic |
| C. | Transient |
| D. | Both static and dynamic |
| Answer» C. Transient | |
| 76. |
In a LVDT, the two secondary voltages |
| A. | Are independent of the core position |
| B. | Vary unequally depending on the core position |
| C. | Vary equally depending on the core position |
| D. | Are always in phase quadrature |
| Answer» C. Vary equally depending on the core position | |
| 77. |
S1: Transducer is a device which converts physical into electrical quantity S2: Transducer is also called as sensor. |
| A. | S1 is true & S2 is false |
| B. | S2 is true & S1 is false |
| C. | Both S1 & S2 are true |
| D. | Both S1 & S2 are false |
| Answer» C. Both S1 & S2 are true | |
| 78. |
Which of the following can be measured with the help of piezo electric crystal? |
| A. | Force |
| B. | Velocity |
| C. | Sound |
| D. | Pressure |
| Answer» B. Velocity | |
| 79. |
LVDT is an/a ___________ transducer |
| A. | Magneto-strict ion |
| B. | Inductive |
| C. | Resistive |
| D. | Eddy current |
| Answer» E. | |
| 80. |
The principle of operation of LVDT is based on the variation of |
| A. | Self inductance |
| B. | Mutual inductance |
| C. | Reluctance |
| D. | Permanence |
| Answer» C. Reluctance | |
| 81. |
The size of air cored transducers in comparison to the iron core parts is |
| A. | Smaller |
| B. | Larger |
| C. | Same |
| D. | Unpredictable |
| Answer» C. Same | |
| 82. |
LVDT windings are wound on |
| A. | Steel sheets |
| B. | Aluminium |
| C. | Ferrite |
| D. | Copper |
| Answer» D. Copper | |
| 83. |
The draw backs of strain gauges are S1: Low fatigue life S2: They are expensive, brittle and sensitive to temperature S3: Poor linearity |
| A. | S1 and S2 |
| B. | S2 and S3 |
| C. | S1 and S3 |
| D. | S1 only |
| Answer» C. S1 and S3 | |
| 84. |
Piezo electric crystal can produce an emf |
| A. | When external mechanical force is applied to i |
| B. | When radiant energy stimulates the crystal |
| C. | When external magnetic field is applied |
| D. | When the junction of two such crystals are heated |
| Answer» B. When radiant energy stimulates the crystal | |
| 85. |
Piezo – electric transducers work when we apply _____________ to it. |
| A. | Mechanical force |
| B. | Vibrations |
| C. | Illuminations |
| D. | Heat |
| Answer» E. | |
| 86. |
Piezo-electric transducers are |
| A. | Passive transducers |
| B. | Inverse transducers |
| C. | Digital transducers |
| D. | Pulse transducers |
| Answer» C. Digital transducers | |
| 87. |
Which of the following are piezo electric substances? 1. Barium titanate 2. Lead titanate 3. Lead Zirconate 4. Cadmium and sulphate |
| A. | 1,2 and 4 |
| B. | 1,3and4 |
| C. | 1,2and 3 |
| D. | 2,3and 4 |
| Answer» D. 2,3and 4 | |
| 88. |
Quartz and Rochelle salt belongs to ___________ of piezo-electric materials |
| A. | Natural group |
| B. | Synthetic group |
| C. | Natural or Synthetic group |
| D. | Fiber group |
| Answer» B. Synthetic group | |
| 89. |
Certain type of materials generates an electrostatic charge or voltage when mechanical force is applied across them. Such materials are called |
| A. | Piezo-electric |
| B. | Photo-electric |
| C. | Thermo-electric |
| D. | Photo-resistive |
| Answer» B. Photo-electric | |
| 90. |
Bonded wire strain gauges are |
| A. | Exclusively used for construction of transducers |
| B. | Exclusively used for stress analysis |
| C. | Used for both stress analysis and construction of transducer |
| D. | Pressure measurement |
| Answer» D. Pressure measurement | |
| 91. |
In wire wound strain gauges, the change in resistance is due to |
| A. | Change in diameter of the wire |
| B. | Change in length of the wire |
| C. | Change in both length and diameter |
| D. | Change in resistivity |
| Answer» D. Change in resistivity | |
| 92. |
The sensitivity factor of strain gauge is normally of the order of |
| A. | 1 to 1.5 |
| B. | 1.5 to 2.0 |
| C. | 0.5 to 1.0 |
| D. | 5 to 10 |
| Answer» C. 0.5 to 1.0 | |
| 93. |
Resolution of a transducer depends on |
| A. | Material of wire |
| B. | Length of wire |
| C. | Diameter of wire |
| D. | Excitation voltage |
| Answer» D. Excitation voltage | |
| 94. |
A strain gauge is a passive transducer and is employed for converting |
| A. | Mechanical displacement into a change of resistance |
| B. | Pressure into a change of resistance |
| C. | Force into a displacement |
| D. | Pressure into displacement |
| Answer» B. Pressure into a change of resistance | |
| 95. |
An inverse transducer is a device which converts |
| A. | An electrical quantity into a non electrical quantity |
| B. | Electrical quantity into mechanical quantity |
| C. | Electrical energy into thermal energy |
| D. | Electrical energy into light energy |
| Answer» B. Electrical quantity into mechanical quantity | |
| 96. |
Strain gauge, LVDT and thermocouple are examples of |
| A. | Active transducers |
| B. | Passive transducers |
| C. | Analog transducers |
| D. | Primary transducers |
| Answer» D. Primary transducers | |
| 97. |
Which of the following is a digital transducer? |
| A. | Strain gauge |
| B. | Encoder |
| C. | Thermistor |
| D. | LVDT |
| Answer» C. Thermistor | |
| 98. |
A transducer that converts measurand into the form of pulse is called |
| A. | Active transducer |
| B. | Analog transducer |
| C. | Digital transducer |
| D. | Pulse transducer |
| Answer» E. | |
| 99. |
The transducers that converts the input signal into the output signal, which is a discrete function of time is known as ___________ transducer. |
| A. | Active |
| B. | Analog |
| C. | Digital |
| D. | Pulse |
| Answer» D. Pulse | |
| 100. |
Self generating type transducers are ___________ transducers. |
| A. | Active |
| B. | Passive |
| C. | Secondary |
| D. | Inverse |
| Answer» B. Passive | |