Power Plant Engineering Objective Questions And Answers

81. For the same cylinder dimensions and same rpm, which of the following engines will produce least power ?

(a) Petrol engine.
(b) Diesel engine.
(c) Supercharged engine.

82. Ships are usually supplied power by

(a) steam accumulators.
(b) hydraulic turbine.
(c) diesel engines.
(d) none of the above.

83. Gas turbine power plants for maximum efficiency may have

(a) heat exchangers.
(b) multistage compression.
(c) reheating.
(d) all of the above.

84. Air will not be the working substance in a

(a) closed cycle gas turbine.
(b) open cycle gas turbine.
(c) petrol engine.
(d) diesel engine.

85. Which of the following plants can never have 100 percent load factor ?

(a) Nuclear power plant.
(b) Hydroelectric power plant.
(c) Base load plant.
(d) Peak load plant.

86. Which of the following power plants needs highly skilled/qualified engineers for its operation ?

(a) Hydro.
(b) Steam.
(c) Nuclear.
(d) Gas turbine.

87. Which of the following power plants will take long period in erection and installation ?

(a) Steam.
(b) Hydro.
(c) Nuclear.
(d) Gas-turbine.

88. Major share of power generated in India is through

(a) hydroelectric power plants.
(b) nuclear power plants.
(c) thermal power plants.
(d) gas turbine power plants.

89. When a ‘pumped storage’ power plant is operated in conjunction with a steam power plant

(a) The operating cost of the steam plant becomes optimum.
(b) Load factor of the steam plant is increased.
(c) Chances of the tripping of the system decrease because of the use of two heterogeneous types of plants.
(d) Operation of the storage plant in the pumping-mode during the low-load period improves the steam-plant stability.

90. Out of the following plant categories

(i) Nuclear (ii) Run-off-river (iii) Pump Storage (iv) Diesel

The base load power plants are
(a) (i) and (ii).
(b) (ii) and (iii).
(c) (i), (ii) and (iv).
(d) (i), (iii) and (iv).

91. The essential requirement(s) for power plants to be operated as base load plants is /are

(a) low operating cost.
(b) capability of operating continuously for long periods.
(c) requirement of few operating personnel and economical repair.
(d) all of the above.

92. The generating station suitable to operate as peak load plant is

(a) Thermal power station.
(b) Nuclear power station.
(c) Pumped storage power station.
(d) none of these.

93. Which of the following power stations is mainly used to cover peak load on the system?

(a) Coal based thermal power plant.
(b) Nuclear power plant.
(c) Gas based thermal power plant.
(d) Pumped storage hydropower plant.

94. The essential requirement(s) for power plants to be operated as peak load plants are

(a) capability of quick start, synchronization and taking up of system load.
(b) quick response to load variations.
(c) low capital cost.
(d) all of the above.

95. Efficiency is of little importance in case of

(a) base load power plants.
(b) peak load plants.
(c) standby plants.
(d) both (b) and (c).

96. The annual cost of generating station can be expressed in the form of Rs (A + B x kW + C x kWh) where A, B, C are constants and kW and kWh represent capacity of the station and energy generated per year respectively. The choice between the “base-load station” and the “peak-load station” basically depends on the fact that

(a) factor B should be less for the peak-load station and factor C should be less for the base-load station.
(b) factor C should be less for the peak-load station and factor B should be less for the base load station.
(c) the factors B and C should both be less for the base-load station.
(d) the factors B and C should both be less for the peak-load station.

97. Which of the following are the advantages of interconnected operation of power systems ?

1. Less reserve capacity requirement.
2. More reliability.
3. High power factor.
4. Reduction in short-circuit level.

Select the correct answer using the codes given below:
(a) 1 and 2.
(b) 2 and 3.
(c) 3 and 4.
(d) 1 and 4.

98. Interconnected systems have the advantage(s) of

(a) reduced reserve plant capacity, capital cost per kW and economy in operation.
(b) improved load factor, diversity factor and operation efficiency and increased reliability of supply.
(c) all of the above.
(d) none of the above.

99. An interconnected system has the following power plants

1. Nuclear, 2. Steam, 3. Diesel, 4. Gas turbine, 5. Hydro with storage, 6. Run-off the river, 7. Pumped storage.

Which of the above three power plants are used exclusively for supplying peak loads ?

(a) 1, 2, 3
(b) 3, 4, 7
(c) 4, 5, 6
(d) 2, 3, 5

100. Which two of the power plants mentioned in above question are used exclusively for supplying base load ?

(a) 1, 5
(b) 1, 2
(c) 1, 6
(d) 4, 6