Power Generation MCQs Part 31

Contents

## A hydroelectric power plant has head of 325 m and has an average flow of 1400 m³/s

A hydroelectric power plant has head of 325 m and has an average flow of 1400 m³/s. The reservoir has an area of 6400 km². The available hydroelectric power is:

- 4459MW
- 2229.5MW
- 1114.75MW
- 891.8MW

Correct answer: 1. 4459MW

Solution:

Formula for available hydroelectric power P is: P = 9.8 QH kW

——————–

P = 9.8 * 1400 * 325 kW = 4459 * 10³ kW = 4459 MW

## The load curve of power station is of

The load curve of power station is of:

- Always negative slope
- Always zero slope
- Always positive slope
- Any of above

Correct answer: 4. Any of above

## A power supply has domestic load having maximum demand of 2000 kW

A power supply has domestic load having maximum demand of 2000 kW. If diversity factor and demand factor are 1.15 and 0.8 respectively, then connected domestic load is:

- 2200
- 2250
- 2300
- 2350

Correct answer: 2. 2250

Solution:

Sum of max demands of different domestic consumers = Max domestic demand * Diversity factor = 2000 * 1.15 = 2300 kW

——————–

Connected domestic load = 2300/Demand factor = 2300/0.8 = 2875 kW

## Overall efficiency of a steam power station is given by

Overall efficiency of a steam power station is given by:

- Overall efficiency = Thermal Efficiency * Electrical efficiency
- Overall efficiency = Thermal Efficiency * Mechanical efficiency
- Overall efficiency = Thermal Efficiency * Prime mover efficiency
- None of these

Correct answer: 1. Overall efficiency = Thermal Efficiency * Electrical efficiency

## A base load power plant has capacity of 18 MW

A base load power plant has capacity of 18 MW. The annual output of power plant is 101.35 * 10^6 kWh. The annual load factor of station is:

- 40.3kW
- 52.3kW
- 64.3%
- 76.3%

Correct answer: 3. 64.3%

Solution:

Annual load factor = 101.35 * 10^6/(18 * 10^3 * 8760) = 0.642 = 64.3%