Power System MCQs Part 4

Contents

- 1 The basic unit of energy is
- 2 The thermal efficiency and electrical efficiency of a power plant are 33% and 88% respectively, the overall efficiency of power plant is
- 3 A power plant has a connected load of 40 MW and a maximum demand of 25 MW. The power plant generates 60 * 10^6 kWh per annum. The demand factor of plant is
- 4 Reserve capacity of power plant is defined as
- 5 Large size nuclear power plants are recommended to be used as

## The basic unit of energy is

The basic unit of energy is:

- joule
- watt
- joule/s
- watt/s

Correct answer: 1. joule

## The thermal efficiency and electrical efficiency of a power plant are 33% and 88% respectively, the overall efficiency of power plant is

The thermal efficiency and electrical efficiency of a power plant are 33% and 88% respectively, the overall efficiency of power plant is:

- 12%
- 9.35%
- 29.04%
- 66.08%

Correct answer: 3. 29.04%

Overall efficiency = Thermal efficiency * Electrical efficiency = 0.33 * 0.88 = 29.04%

## A power plant has a connected load of 40 MW and a maximum demand of 25 MW. The power plant generates 60 * 10^6 kWh per annum. The demand factor of plant is

A power plant has a connected load of 40 MW and a maximum demand of 25 MW. The power plant generates 60 * 10^6 kWh per annum. The demand factor of plant is:

- 0.457
- 0.52
- 0.625
- 0.75

Correct answer: 3. 0.625

Solution: Demand factor = Maximum demand / Connected load = 25 MW/40 MW = 0.625

## Reserve capacity of power plant is defined as

Reserve capacity of power plant is defined as:

- Reserve capacity = Plant capacity + Max demand
- Reserve capacity = Plant capacity – Max demand
- Reserve capacity = Max demand – Plant capacity
- Reserve capacity = Plant capacity * Max demand

Correct answer: 2. Reserve capacity = Plant capacity – Max demand

## Large size nuclear power plants are recommended to be used as

Large size nuclear power plants are recommended to be used as:

- Peak load power plants
- Base load power plants

Correct answer: 2. Base load power plants