McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 51. |
Illuminating gas is |
| A. | blast furnace gas |
| B. | coal and carburretted water gas |
| C. | methane gas |
| D. | light petroleum gas |
| E. | None of the above |
| Answer» B. coal and carburretted water gas | |
| 52. |
Deuterium oxide is used in nuclear reactors as |
| A. | fuel |
| B. | moderator |
| C. | shield |
| D. | regulator |
| E. | None of the above |
| Answer» B. moderator | |
| 53. |
The advantage of dc transmission system over ac transmission system is |
| A. | dc system it economical |
| B. | there is no skin effect in dc system |
| C. | corona limits are highest for dc circuits as compared to ac circuits |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 54. |
In a medium transmission line the effect of |
| A. | resistance and inductance is negligible but effect of capacitance is taken into account |
| B. | resistance is negligible |
| C. | capacitance is negligible |
| D. | inductance is negligible |
| E. | resistance, capacitance and inductance is taken into account |
| Answer» E. resistance, capacitance and inductance is taken into account | |
| 55. |
The presence of CO2 and H2O in the atmosphere results in absorption of |
| A. | short wave ultraviolet radiations |
| B. | visible wavelengths of spectrum |
| C. | long wave infrared radiations |
| D. | all of the above |
| E. | None of the above |
| Answer» C. long wave infrared radiations | |
| 56. |
The calorific value of natural gas is expected to be around |
| A. | 2000 kcal/m3 |
| B. | 500 kcal/m3 |
| C. | 1500 kcal/m3 |
| D. | 2500 kcal/m3 |
| E. | 25000 kcal/m3 |
| Answer» B. 500 kcal/m3 | |
| 57. |
The name DVC is associated with which type of power generation? |
| A. | Gas turbine |
| B. | Hydro-electric |
| C. | Thermal |
| D. | Diesel engine |
| E. | Nuclear |
| Answer» B. Hydro-electric | |
| 58. |
Which of the following gas is sometimes filled in filament lamps? |
| A. | Hydrogen |
| B. | Helium |
| C. | Argon |
| D. | Ozone |
| E. | Oxygen |
| Answer» C. Argon | |
| 59. |
The heating value of coal largely depends on |
| A. | Sulphur content |
| B. | Volatile matter |
| C. | Moisture content |
| D. | Size of coal particles |
| E. | Carbon content |
| Answer» E. Carbon content | |
| 60. |
Pulverised coal is |
| A. | Non-smoking coal |
| B. | Coal free from as content |
| C. | Coal which burns for long time |
| D. | Coal free from sulphur |
| E. | Coal broken into fine pieces |
| Answer» E. Coal broken into fine pieces | |
| 61. |
The skin effect of a conductor will reduce as |
| A. | the diameter increases |
| B. | the frequency increases |
| C. | the permeability of conductor material increases |
| D. | the resistivity of conductor material increases |
| E. | None of the above |
| Answer» D. the resistivity of conductor material increases | |
| 62. |
The calorific value of diesel oil is expected to be around |
| A. | 21000 kcal/kg |
| B. | 5000 kcal/kg |
| C. | 16000 kcal/kg |
| D. | 1000 kcal/kg |
| E. | 11000 kcal/kg |
| Answer» E. 11000 kcal/kg | |
| 63. |
The expected life of wooden poles is |
| A. | 1 year |
| B. | 5 years |
| C. | 15 years |
| D. | 50 years |
| E. | None of the above |
| Answer» C. 15 years | |
| 64. |
The average cost of power per kWh for domestic consumers in India is |
| A. | 10 to 15 paise |
| B. | 20 to 30 paise |
| C. | 30 to 45 paise |
| D. | 50 to 65 paise |
| E. | None of the above |
| Answer» D. 50 to 65 paise | |
| 65. |
Betz law finds application in |
| A. | MHD systems |
| B. | Solar cells |
| C. | Geothermal power plants |
| D. | Wind mills |
| E. | None of the above |
| Answer» D. Wind mills | |
| 66. |
When a 66 kV transmission line passes over a residential building, the minimum vertical clearance from the roof of the building must be |
| A. | 4 metres |
| B. | 7.5 metres |
| C. | 10 metres |
| D. | 15 metres |
| E. | None of the above |
| Answer» A. 4 metres | |
| 67. |
The highest voltage at which the power is transmitted in India is |
| A. | 33 kV |
| B. | 66 kV |
| C. | 132 kV |
| D. | 400 kV |
| E. | 220 kV |
| Answer» D. 400 kV | |
| 68. |
Activated carbon is used for |
| A. | absorption of gases |
| B. | paints and varnishes as colouring agent |
| C. | purification of water |
| D. | production of carbon steels |
| E. | None of the above |
| Answer» A. absorption of gases | |
| 69. |
In any transmission line, which two generalised constants are equal? |
| A. | A and B |
| B. | A and C |
| C. | A and D |
| D. | B and C |
| E. | C and D |
| Answer» C. A and D | |
| 70. |
In case of oil fired boiler, the excess air is usually |
| A. | 1 to 2 percent |
| B. | 5 to 12 percent |
| C. | 20 to 25 percent |
| D. | 75 to 125 percent |
| E. | None of the above |
| Answer» B. 5 to 12 percent | |
| 71. |
Watt second is the unit of |
| A. | Force |
| B. | Momentum |
| C. | Power |
| D. | Energy |
| E. | None of the above |
| Answer» D. Energy | |
| 72. |
A metallic sheath is provided on cable |
| A. | to protect against moisture, gases and other damaging liquids |
| B. | to protect from mechanical damage due to rubbing |
| C. | to protect against sparking |
| D. | to avoid damage to the cable during laying |
| E. | All of the above |
| Answer» A. to protect against moisture, gases and other damaging liquids | |
| 73. |
The efficiency of a thermal power plant improves with |
| A. | Larger quantity of water used |
| B. | Lower load on the plant |
| C. | Increased quantity of coal burnt |
| D. | Use of high pressure steam |
| E. | All of the above |
| Answer» D. Use of high pressure steam | |
| 74. |
Which of the following is the advantage of de transmission? |
| A. | Absence of line inductance and capacitance problems |
| B. | No skin effects |
| C. | For the same working voltage the potential stress on the insulation is less |
| D. | No stability problems |
| E. | All of the above |
| Answer» E. All of the above | |
| 75. |
Burning of low grade fuels can be improved by |
| A. | Blending with better quality |
| B. | Oil assisted ignition |
| C. | Pulverising |
| D. | Any of the above |
| E. | None of the above |
| Answer» D. Any of the above | |
| 76. |
Which of the following is a natural solid fuel? |
| A. | Pulverised coal |
| B. | Wood charcoal |
| C. | Bituminous coal |
| D. | Coking coal |
| E. | None of the above |
| Answer» C. Bituminous coal | |
| 77. |
The power factor of a 3 phase induction motor near full load is expected to be around |
| A. | 0.5 leading |
| B. | 0.5 lagging |
| C. | 0.1 lagging |
| D. | 0.8 lagging |
| E. | 0.8 leading |
| Answer» D. 0.8 lagging | |
| 78. |
When geothermal energy is available in the form of saline water, power is developed using |
| A. | flashed - steam system |
| B. | binary - cycle system |
| C. | total flow system |
| D. | any of the above |
| E. | None of the above |
| Answer» D. any of the above | |
| 79. |
If an engine has spark plugs, it can be safely concluded that it is |
| A. | a two stroke engine |
| B. | a air cooled engine |
| C. | not a diesel engine |
| D. | a four stroke engine |
| E. | a water cooled engine |
| Answer» C. not a diesel engine | |
| 80. |
No moving parts are required in |
| A. | MHD generator |
| B. | Tidal power plant |
| C. | Thermionic conversion |
| D. | OTEC power plant |
| E. | None of the above |
| Answer» C. Thermionic conversion | |
| 81. |
The work of installation and commissioning of power plants in India is generally undertaken by |
| A. | NHPC Ltd |
| B. | Steel Authority of India |
| C. | NTPC Ltd. |
| D. | Coal Authority of India |
| E. | HAL |
| Answer» C. NTPC Ltd. | |
| 82. |
When the reactive component is small |
| A. | the phase angle will be small and p.f. will be leading |
| B. | the phase angle will be large and p.f. will be high |
| C. | the phase angle will be small and p.f. will be unity |
| D. | the phase angle will be small and p.f. will be high |
| E. | the phase angle will be large and p.f. will be low |
| Answer» D. the phase angle will be small and p.f. will be high | |
| 83. |
Which of the following colour has wavelength between green and red colour? |
| A. | Yellow |
| B. | Blue |
| C. | Violet |
| D. | All of the above |
| E. | None of the above |
| Answer» A. Yellow | |
| 84. |
Which of the following statement is correct? |
| A. | Wind pressure reduces corona effects |
| B. | Ice on conductors improves power factor |
| C. | Wind pressure is taken to act in a direction at right angles to that for ice |
| D. | Wind pressure and ice on conductors together improve regulation of power transmitted |
| E. | None of the above |
| Answer» C. Wind pressure is taken to act in a direction at right angles to that for ice | |
| 85. |
An Orsat apparatus gives |
| A. | volumetric analysis |
| B. | gravimetric analysis |
| C. | approximate analysis |
| D. | only presence of constituents |
| E. | None of the above |
| Answer» A. volumetric analysis | |
| 86. |
The specific gravity of copper is |
| A. | 8.9 |
| B. | 16.9 |
| C. | 13.9 |
| D. | 2.9 |
| E. | 5.9 |
| Answer» E. 5.9 | |
| 87. |
Conductors for high voltage transmission lines are suspended from towers |
| A. | to reduce clearance from ground |
| B. | to increase clearance from ground |
| C. | to reduce wind and snow loads |
| D. | to take care of extension in length during summer |
| E. | None of the above |
| Answer» D. to take care of extension in length during summer | |
| 88. |
Economiser in a steam power plant is used |
| A. | To preheat air |
| B. | To preheat feed water |
| C. | To superheat steam |
| D. | None of the above |
| E. | None of the above |
| Answer» B. To preheat feed water | |
| 89. |
A pin type insulator is generally used upto |
| A. | 66 kV |
| B. | 132 kV |
| C. | 33 kV |
| D. | 1.1 kV |
| E. | 11 kV |
| Answer» C. 33 kV | |
| 90. |
Naphtha is a volatile colourless product obtained from |
| A. | methyl alcohol |
| B. | vinyl acetate |
| C. | sugar cane |
| D. | petroleum |
| E. | None of the above |
| Answer» D. petroleum | |
| 91. |
A 66 kV transmission line carrying power to a distance of 120 kilometre will be termed as |
| A. | Short transmission line |
| B. | Very short transmission line |
| C. | Long transmission line |
| D. | Medium transmission line |
| E. | Tiny transmission line |
| Answer» D. Medium transmission line | |
| 92. |
Solar cells are made of |
| A. | silicon |
| B. | germanium |
| C. | silver |
| D. | aluminium |
| E. | None of the above |
| Answer» A. silicon | |
| 93. |
In case the supply frequency is reduced from 50 Hz to 1 Hz which method of heating will be least affected? |
| A. | Resistance heating |
| B. | Dielectric heating |
| C. | Induction heating |
| D. | All of the above |
| E. | None of the above |
| Answer» A. Resistance heating | |
| 94. |
Bottoming cycle in case of combined cycle power geneation is normally |
| A. | Gas turbine cycle |
| B. | Steam cycle |
| C. | any of the above |
| D. | None of the above |
| E. | None of the above |
| Answer» B. Steam cycle | |
| 95. |
The major disadvantage with solar cells for power generation is |
| A. | lack of availability |
| B. | large area requirement |
| C. | variable power |
| D. | high cost |
| E. | None of the above |
| Answer» D. high cost | |
| 96. |
Earth coal is |
| A. | lignite |
| B. | coal dust |
| C. | black earth |
| D. | wet coal |
| E. | None of the above |
| Answer» A. lignite | |
| 97. |
Barytes concrete is generally used in |
| A. | nuclear power plants |
| B. | construction of dams |
| C. | foundations for heavy equipment |
| D. | construction of cooling towers |
| E. | None of the above |
| Answer» A. nuclear power plants | |
| 98. |
The disadvantage of using solar evergy for power production is |
| A. | Requirements of large area for harnessing solar energy |
| B. | Energy available during day time only |
| C. | Energy not available during cloudy weather |
| D. | Initial cost is high |
| E. | All of the above |
| Answer» E. All of the above | |
| 99. |
Chain gate stokers cannot be used for |
| A. | coal lumps |
| B. | low ash content coals |
| C. | high ash content coals |
| D. | None of the above |
| E. | None of the above |
| Answer» C. high ash content coals | |
| 100. |
Heat rate : Efficiency |
| A. | Coal : Oil |
| B. | Momentum : Variable cost |
| C. | Fixed cost : Variable cost |
| D. | Resistance : Conductance |
| E. | None of the above |
| Answer» D. Resistance : Conductance | |
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