McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 51. |
A pirani gauge works on the principle of change of |
| A. | Capacitance |
| B. | Electrical resistivity |
| C. | Relative humidity |
| D. | Thermal conductivity of medium |
| E. | Conductance |
| Answer» D. Thermal conductivity of medium | |
| 52. |
The thickness of oil film between gage blocks is of the order of |
| A. | 0.2 microinch |
| B. | 0.5 microinch |
| C. | 1 microinch |
| D. | None of the above |
| E. | Any of the above |
| Answer» A. 0.2 microinch | |
| 53. |
The degree of perfection used in instruments, the methods and the observations, is known as |
| A. | Error |
| B. | Least count |
| C. | Accuracy |
| D. | Efficiency |
| E. | Precision |
| Answer» E. Precision | |
| 54. |
A flow measuring system with a square root extractor usually has |
| A. | Linear scale |
| B. | No-linear scale |
| C. | Inverse square law curve |
| D. | Mass flow rate scale |
| E. | None of the above |
| Answer» A. Linear scale | |
| 55. |
A flapper nozzle is used in |
| A. | Electronic controller |
| B. | Hydraulic Controller |
| C. | Pneumatic controller |
| D. | All of the above |
| E. | None of the above |
| Answer» C. Pneumatic controller | |
| 56. |
Which of the following materials has minimum temperature coefficient of resistance |
| A. | Constantan |
| B. | Isoelastic |
| C. | Nichrome |
| D. | None of the above |
| E. | Any of the above |
| Answer» A. Constantan | |
| 57. |
The direction of current in case of antimony bismuth thermocouple will be |
| A. | From antimony to bismuth at the cold junction |
| B. | From antimony to bismuth at hot junction |
| C. | From bismuth to antimony at cold junction |
| D. | Any of the above |
| E. | None of the above |
| Answer» A. From antimony to bismuth at the cold junction | |
| 58. |
A hydrometer can be used to measure |
| A. | Specific gravity of solids |
| B. | Temperature coefficient of liquids |
| C. | Relative humidity of air |
| D. | Conductivity of gases |
| E. | Specific gravity of liquids |
| Answer» E. Specific gravity of liquids | |
| 59. |
The advantage of piezoelectric crystal as transducer is |
| A. | High frequency response |
| B. | High output |
| C. | Negligible phase shift |
| D. | Small size |
| E. | All of the above |
| Answer» E. All of the above | |
| 60. |
In a thermocouple, the potential between the two junctions is due to the temperature gradient along the conductors in the circuit. This effect is named as |
| A. | Peltier's effect |
| B. | Thomson's effect |
| C. | Seebeck effect |
| D. | none of the above |
| E. | Any of the above |
| Answer» B. Thomson's effect | |
| 61. |
Nickel is the major constituent of which the following pressure gauge Bourdon tube material |
| A. | Alloy steel |
| B. | Phosphor bronze |
| C. | K' monel |
| D. | Beryllium copper |
| E. | Stainless steel |
| Answer» C. K' monel | |
| 62. |
In a car the fuel level is measured by |
| A. | Electronic transducer |
| B. | Float method |
| C. | Dip stick |
| D. | Any of the above |
| E. | None of the above |
| Answer» B. Float method | |
| 63. |
Flow rate of a river can be determined by |
| A. | Weir |
| B. | Orifice |
| C. | Venturimeter |
| D. | Kundt's tube |
| E. | Kennison nozzle |
| Answer» A. Weir | |
| 64. |
Under force-current analogy, the reciprocal of inductance is considered analogous to |
| A. | Mass |
| B. | Spring constant |
| C. | Momentum |
| D. | Displacement |
| E. | Velocity |
| Answer» B. Spring constant | |
| 65. |
The larget range through which the measurable variable can change without the change being indicated by the indicator is known as |
| A. | Probability error |
| B. | Time lag |
| C. | Dead zone |
| D. | Threshold sensitivity |
| E. | None of the above |
| Answer» C. Dead zone | |
| 66. |
Which of the following instruments is preferred for the measurement of pressure in a steam condenser |
| A. | Kentometer |
| B. | McLeod gage |
| C. | Bourdon tube |
| D. | None of the above |
| E. | Any of the above |
| Answer» A. Kentometer | |
| 67. |
Which of the following materials has macimum gaga factor |
| A. | Nichrome |
| B. | Isoelastic |
| C. | Karma |
| D. | None of the above |
| E. | Any of the above |
| Answer» B. Isoelastic | |
| 68. |
The most sensitive thermocouple out of the following |
| A. | copper-constantan |
| B. | chromel-constantan |
| C. | iron-constantan |
| D. | None of the above |
| E. | Any of the above |
| Answer» B. chromel-constantan | |
| 69. |
Invar, the least expensible steel alloys used for measuring tapes contains about 30% of |
| A. | Vanadium |
| B. | Cobalt |
| C. | Aluminium |
| D. | Copper |
| E. | Nickel |
| Answer» E. Nickel | |
| 70. |
The statement "The most probable value of an observed quantity available from a given set of observation is the one for which the sum of the square of errors is a minimum" is known as |
| A. | Principle of square errors |
| B. | Pythogorus theorem |
| C. | Principle of least squares |
| D. | Law of square probability |
| E. | Law of errors |
| Answer» C. Principle of least squares | |
| 71. |
For bridge circuit of strain gauge which source of power will be ideal? |
| A. | High frequency ac source |
| B. | Low frequency ac source |
| C. | Difficulties in connections and high cost of auxiliary equipment |
| D. | Low voltage of source |
| E. | High voltage dc source |
| Answer» A. High frequency ac source | |
| 72. |
A first order system when subjected to a step input has a temperature rise of 25?C after one hour and 37.5?C after two hours, starting from cold conditions. The final steady temperature rise will be |
| A. | 5?C |
| B. | 15?C |
| C. | 35?C |
| D. | 25?C |
| E. | 50?C |
| Answer» E. 50?C | |
| 73. |
The degree of perfection used in instruments, techniques are observations is known as |
| A. | Accuracy |
| B. | Precision |
| C. | Least Count |
| D. | None of the above |
| E. | Any of the above |
| Answer» B. Precision | |
| 74. |
An electrometer is used for the measurement of |
| A. | Voltages |
| B. | Currents |
| C. | Both (A) and (B) above |
| D. | None of the above |
| E. | 14 |
| Answer» C. Both (A) and (B) above | |
| 75. |
A synchro is |
| A. | A variable reluctance transducer |
| B. | A parabolic transducer |
| C. | An angular position transducer |
| D. | A synchronizing transducer |
| E. | Any of the above |
| Answer» C. An angular position transducer | |
| 76. |
The errors which form inexperience of the observer are known as |
| A. | Personal errors |
| B. | Mistakes |
| C. | Training errors |
| D. | Accidental errors |
| E. | Handling errors |
| Answer» B. Mistakes | |
| 77. |
The duty cycle of a pulse of width 2 micro sec and repetition frequency 4 kHz is |
| A. | 0.5 |
| B. | 0.008 |
| C. | 0.05 |
| D. | 0.0006 |
| E. | 0.00008 |
| Answer» B. 0.008 | |
| 78. |
Which of the following device cannot be used to measure pressure? |
| A. | Pirani gauge |
| B. | Strain gauge |
| C. | LVDT |
| D. | Manometer |
| E. | Bolometer |
| Answer» E. Bolometer | |
| 79. |
If a measuring tape is too long as compared to standard, the error will be known as |
| A. | Manufacturing error |
| B. | Natural error |
| C. | Superficial error |
| D. | Personal error |
| E. | Instrumental error |
| Answer» E. Instrumental error | |
| 80. |
An iron-constantan thermocouple can be used for the temperature |
| A. | ?175?C to 900?C |
| B. | ?250?V to 1500?C |
| C. | ?373?C to 1800?C |
| D. | 0?C to 2500?C |
| E. | 0?C to 600?C |
| Answer» A. ?175?C to 900?C | |
| 81. |
For measuring the temperature of a boiler furnace which one of the following is the appropriate thermometer? |
| A. | Optical pyrometer |
| B. | Bimetallic thermometer |
| C. | Thermocouple |
| D. | Resistance thermometer |
| E. | Any of the above |
| Answer» A. Optical pyrometer | |
| 82. |
The resistance of a strain gauge should be high |
| A. | To increase sensitivity |
| B. | To reduce hysteresis effect |
| C. | To swamp out the effects of variations of resistance in other parts of the bridge |
| D. | None of the above |
| E. | 100 to 5000 |
| Answer» B. To reduce hysteresis effect | |
| 83. |
Which of the following transducer is used to translate linear motion into electrical signals? |
| A. | Bourdons tube |
| B. | LVDT |
| C. | Bellows |
| D. | Strain gauge |
| E. | Thermistor |
| Answer» B. LVDT | |
| 84. |
If an error under the same conditions will always be of the same size and sign, it is known as |
| A. | Training errors |
| B. | Systematic errors |
| C. | Cumulative error |
| D. | Either of (A) and (B) above |
| E. | Either of (B) and (C) above |
| Answer» E. Either of (B) and (C) above | |
| 85. |
The degree of fementation in brewing pressure can be measured by |
| A. | Bolometer |
| B. | Conductivity meter |
| C. | pH meter |
| D. | Smoke meter |
| E. | Turbidity meter |
| Answer» C. pH meter | |
| 86. |
Which of the following will be the most alkaline solution? |
| A. | pH 4 |
| B. | pH 1 |
| C. | pH 7 |
| D. | pH 10 |
| E. | pH 14 |
| Answer» E. pH 14 | |
| 87. |
McLeod gage is used to measure |
| A. | pressure |
| B. | vacuum |
| C. | Flow rate |
| D. | None of the above |
| E. | Any of the above |
| Answer» A. pressure | |
| 88. |
The standard oxygen point temperature is |
| A. | 182.97?C |
| B. | ?213.99?C |
| C. | 163.45?C |
| D. | ?182.27?C |
| E. | 0?C |
| Answer» D. ?182.27?C | |
| 89. |
In measurements using two strain gauges, the purpose of dummy strain gauge is |
| A. | To unllify the errors due to temperature |
| B. | Improve stability of the measuring system |
| C. | Measure lateral strain |
| D. | Increase the sensitivity of measuring system |
| E. | None of the above |
| Answer» A. To unllify the errors due to temperature | |
| 90. |
If a steam pressure of 10 kg/cm2 is to be measured, the range of pressure gauge should be |
| A. | 0 to 100 kg kg/cm2 |
| B. | 0 to 10 kg kg/cm2 |
| C. | 0 to 20 kg kg/cm2 |
| D. | ?10 kg/cm2 to + 10 kg kg/cm2 |
| E. | 5 to 11 kg kg/cm2 |
| Answer» C. 0 to 20 kg kg/cm2 | |
| 91. |
Which of the following can be used as thermal detector? |
| A. | Thermistor |
| B. | Pyrometer |
| C. | Thermocouple |
| D. | Resistance thermometer |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 92. |
The electricl resistarice of a wire is |
| A. | Directly proportional to diameter and inversely proportional to length |
| B. | Directly proportional to length and inversely proportional to diameter |
| C. | Directly proportional to length and diameter |
| D. | Inversely proportional to resistance and length |
| E. | None of the above |
| Answer» A. Directly proportional to diameter and inversely proportional to length | |
| 93. |
The joints of a phosphor-bronze Bourdon tubes are |
| A. | Welded |
| B. | Brazed |
| C. | Soldered |
| D. | Jointed by adhesives |
| E. | Screwed |
| Answer» C. Soldered | |
| 94. |
Which of the following temperature is highest. |
| A. | Melting point of gold |
| B. | melting point of silver |
| C. | melting point of steel |
| D. | None of the above |
| E. | Any of the above |
| Answer» D. None of the above | |
| 95. |
Which of the following device can be used to give an indication for temperature changes? |
| A. | Thermistor |
| B. | Bourden gauge |
| C. | Transistor |
| D. | Thermocouple |
| E. | LED |
| Answer» D. Thermocouple | |
| 96. |
A simple ac amplifier may be used to amplify dc input through use of an additional circuit component known as |
| A. | tuned amplifier |
| B. | carrier |
| C. | chopper |
| D. | None of the above |
| E. | Any of the above |
| Answer» C. chopper | |
| 97. |
Positive displacement flow meters are |
| A. | variable area flow meter |
| B. | differential pressure flow meter |
| C. | quantity flow meter |
| D. | None of the above |
| E. | Any of the above |
| Answer» C. quantity flow meter | |
| 98. |
Which of the following meter is preferred for the measurement of pressure in a steam condenser? |
| A. | Manometer |
| B. | Kentometer |
| C. | Pitot tube |
| D. | Mcleod gauge |
| E. | None of the above |
| Answer» B. Kentometer | |
| 99. |
A rotameter is used to measure |
| A. | velocity of liquids |
| B. | pressure of gases |
| C. | specific gravity of liquids |
| D. | None of the above |
| E. | Any of the above |
| Answer» A. velocity of liquids | |
| 100. |
Which of the following transducer is preferred for measurements involving sound? |
| A. | Piezoelectric pick up |
| B. | Photoemissive cell |
| C. | Volt box |
| D. | Kundt's tube |
| E. | Thermocouple |
| Answer» A. Piezoelectric pick up | |
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