Mcqs or Objective Question on Power System | Power systems Questions And Answers| Only4electrical |
1).Which of the following rotor is used in thermal power plants ?
a)
Cylindrical rotor
Cylindrical rotor
b)
Salient rotor
Salient rotor
c)
Either of these
Either of these
d)
Squirrel cage rotor
Squirrel cage rotor
Answer: a) Cylindrical rotor is also called as round rotor or smooth rotor, there is no projection, there a closed portion contains field winding which is distributed and unslotted portion also acts as poles. It has large axial length and small diameter, resulting high peripheral speed. As the air gap is uniform throughout the machine it is more suitable for high speed operation, employed in all thermal, nuclear power plant containing turbo alternators with two or Maximum four poles only ( speed ∝ 1/poles)
2). Which of the following is/are the base load plants?
a)
Thermal plants
Thermal plants
b)
Nuclear plant
Nuclear plant
c)
Hydro plant
Hydro plant
d)
All of the above
All of the above
Answer: d) Base load plants: A base load power plants is a power station that usually provides a continuous electric power throughout the year with some minimum power generation requirement. Base load power plants are turned off only during maintenance, service or upgrading.base load power plants has the character of slow demand respond.
The following are the some of examples of base load power plants
1.Thermal plants 2.Nuclear plants 3.Hydro plants 4.Tidal plants
3.Objectives of power system is/are
a)
Rated voltage and frequency has to be supplied to the consumer
Rated voltage and frequency has to be supplied to the consumer
b)
Cost of electrical energy per KWh is to be minimum
Cost of electrical energy per KWh is to be minimum
c)
Both 1 and 2
Both 1 and 2
d)
Nether 1 nor 2
Nether 1 nor 2
Answer: c) Objectives of power system are : 1.cost of the electrical energy per KWh is to be minimum. 2.Reliable power has to be supply 3.Effective protection system has to be used for isolating faulty section and keeping other section healthy 4.Rated voltage and frequency should be supplied to the consumer 5. Flexible power to be available.
4). Peak load power plants is/are?
a)
Diesel plant
Diesel plant
b)
Pumped stored power plant
Pumped stored power plant
c)
Nuclear power plant
Nuclear power plant
d)
Both 1 and 2
Both 1 and 2
Answer: d)
Peak load power plant :
1.A peak load power plant is a power station that only runs during the high demand of electricity throughout the day during the peak hours. Because of that, the price of electricity it generates is generally grater then the electricity generated by base load power plant, which operates continuously throughout the year
The following are the some of the peak load power plants
1.pumped stored power plant 2.diesel plant 3.hydro plant (when water availability is less) 3.Gas fired power plant.
5). The value of diversity factor is
a)
1
1
b)
0
0
c)
Less the 1
Less the 1
d)
Grater then 1
Grater then 1
Answer: b) Diversity factor defined the ration of sum of individual maximum demand to the station maximum demand. Diversity factor = sum of the individual maximum demand/station maximum demand.
Therefore, the value of diversity factor is grater then 1
6). Plant capacity factor value is ?
a)
1
1
b)
0
0
c)
Grater then 1
Grater then 1
d)
Less then 1
Less then 1
Answer: d) Plant capacity factor is defined as the ratio of average power to the plant capacity. Therefore the value of plant capacity factor is less then 1
7). Pumped storage power plant is a
a)
Peak load plant
Peak load plant
b)
Base load power plant
Base load power plant
c)
Both 1 and 2
Both 1 and 2
d)
Non of the above
Non of the above
Answer: a) A peak load power plant is a power station which only runs during high demand of electricity throughout the day during peak hours. because of that reason the cast of energy generated is grater then the electricity generated by the base load power plants, which operates continuously throughout the year
Example for peak load plants are
1.pumped storage plants 2.diesel plants 3.Hydro plant (When water availability is less) 4.gas fired power plans
8). Advantage of pumped storage power plant is/are
a)
Most economical as a peak load supply plant
Most economical as a peak load supply plant
b)
Operating time is minimum
Operating time is minimum
c)
Used as load frequency control
Used as load frequency control
d)
All of the above
All of the above
Answer: d) Advantages of pumped storage power plant
1.Most economical as a peak load supply plant 2. Operating time is minimum 3. Used as load frequency control 4. pollution free 5. Easily adaptable for remote operation
9). Which of the following plant is/are base load plants
a)
run of river
run of river
b)
Nuclear
Nuclear
c)
Pumped storage
Pumped storage
d)
Both 1 and 2
Both 1 and 2
Answer: d)
Example of base load power plants
1. Thermal plant 2. hydro plant 3.Nuclear plant 4. Run of river plant 5. Tidal plant
10). What is the function of economiser in steam boiler
a)
Colling
Colling
b)
Improve thermal efficiency
Improve thermal efficiency
c)
Collect ash particles
Collect ash particles
d)
All of the above
All of the above
Answer: b) Economiser is used to absorbing heat from the flue gas for increasing the temperature of the water so that improve the thermal efficiency.
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