Power Plant Engineering Mcq Questions Pdf

61. Ash content of coal can be reduced by

(a) pulverizing.
(b) washing.
(c) slow burning.
(d) mixing with high grade coal.

62. Combustible elements in the fuel are

(a) carbon and hydrogen.
(b) carbon, hydrogen and ash.
(c) carbon, hydrogen and sulphur.
(d) carbon, nitrogen and ash.

63. The percentage of carbon in anthracites is usually

(a) more than 90%.
(b) about 70%.
(c) about 50%.
(d) below 40%.

64. Solvent refined coal has low percentage of

(a) impurities.
(b) sulphur.
(c) ash.
(d) all of the above.

65. Presence of sulphur content in coal will cause

(a) spontaneous combustion during coal storage and air heater corroding.
(b) clinkering and slagging.
(c) facilitating ash precipitation.
(d) all of the above.

66. Sulphur content of liquid fuels assumes importance from the point of view of

(a) firing rate.
(b) heating rate.
(c) corrosion.
(d) efficiency.

67. Chemical composition of coal is given by

(a) ultimate analysis.
(b) proximate analysis.
(c) gross analysis.
(d) any of the above.

68. Ultimate analysis of fuel determines the percentage of

(a) ash, volatile matter and moisture.
(b) total carbon by weight.
(c) total carbon by weight – unit weight of H₂, 0₂, N₂, sulphur and ash. (d) none of the above.

69. Complete combustion of pulverized coal in a steam raising thermal power plant is ensured by what type of an analysis of flue gas going out by the chimney?

(a) 0₂ content forgiven air intake.
(b) CO₂ content for given fuel rate feed.
(c) CO content.
(d) All of these.

70. The proximate analysis of coal gives percentage by weight of

(a) moisture, and volatile matter.
(b) moisture, volatile matter, fixed carbon and ash.
(c) carbon, hydrogen, oxygen, nitrogen, sulphur and ash.
(d) carbon, hydrogen, and oxygen.

71. The ash content of bituminous coal is

(a) 2 to 3%
(b) 6 to 12%
(c) 15 to 20%

72. The most important factors to be considered in the selection of fuel for power plants include

(a) cost of fuel.
(h) calorific value of fuel.
(c) none of the above.
(d) both (a) and (b).

73. Live storage of coal in power plant means

(a) a covered storage near the boiler furnace having coal sufficient to meet 24 hour demand of the power plant
(b) coal in transit.
(c) coal ready for combustion.
(d) storage of coal sufficient to meet one week demand of the plant readily.

74. In a steam power plant, coal is carried from storage to boiler generally by means of

(a) trolleys.
(b) V-belts.
(c) buckets.
(d) manually.

75. Belt conveyors can be employed for transporting coal at inclination up to

(a) 75°
(b) 60°
(c) 30°
(d) 15°

76. The maximum length of a screw conveyor is around

(a) 85 – 90%
(c) 40 – 60%
(b) 60 – 75%
(d) 15 – 30%

77. In small power plants, coal is unloaded by means of

(a) belt conveyors.
(b) coal accelerators.
(c) lift trucks.
(d) all of the above.

78. Load carrying capacity of a belt conveyor is around

(a) 10 – 20 tonnes per hour.
(b) 20 – 40 tonnes per hour.
(c) 50 – 100 tonnes per hour.
(d) 100 – 160 tonnes per hour.

79. Bucket elevators are employed for

(a) carrying coal in vertical direction.
(b) carrying coal in horizontal direction.
(c) carrying coal in any direction.
(d) none of the above.

80. In coal preparation plants, the magnetic separation are used for removing

(a) dust.
(b) iron particles.
(c) clinkers.
(d) all of the above.