# Power System MCQs Part 4

Power System MCQs Part 4

Contents

## The basic unit of energy is

The basic unit of energy is:

1. joule
2. watt
3. joule/s
4. watt/s

## 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:

1. 12%
2. 9.35%
3. 29.04%
4. 66.08%

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:

1. 0.457
2. 0.52
3. 0.625
4. 0.75

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:

1. Reserve capacity = Plant capacity + Max demand
2. Reserve capacity = Plant capacity – Max demand
3. Reserve capacity = Max demand – Plant capacity
4. 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: