Question

Which one of the following statements about power stations is not true?
(a) hydroelectric power stations use water to drive turbines
(b) in a power station, turbines drive generators
(c) electricity from thermal power stations differs from that produced in hydroelectric power stations
(d) in hydroelectric power stations and thermal power stations, alternators produce electricity

Answer 1

Answer:

option d is the incorrect answer

Answer 2

Answer:

The correct option for the given question is an option(c): electricity from thermal power stations differs from that produced in hydroelectric power stations.

Explanation:

Statement-1:

• Normally hydroelectric power stations use reservoirs to store river water by building dams.
• This water is released from the reservoir making it flow through the turbines which in turn spin to activate a generator for generating electricity.
• So, statement-1 is correct.

Statement-2:

• Electricity is mainly produced by converting the mechanical energy of the turbine to electrical energy via generators.

• So, turbines are widely used in power stations.
• Thus, statement-2 is also correct.

Statement-3:

• There is no such difference in the electricity produced in thermal power stations and hydroelectric power stations.
• So, statement-3 is false. The correct option for the given question is an option(c): electricity from thermal power stations differs from that produced in hydroelectric power stations.

Statement-4:  

• We have seen in an earlier statement that in hydroelectric power stations, the turbine produces electricity.
• Similarly, in a thermal power station, steam helps in activating the turbine which then rotates to produce electricity via generators.
• So, this statement is also correct.

All the above explanations prove clearly, that the statement saying that electricity in thermal power stations and hydroelectric power stations is different is false.