# Power Generation MCQs Part 16

Power Generation MCQs Part 16

## The cheapest power plant in terms of operation and maintenance is

The cheapest power plant in terms of operation and maintenance is:

1. Diesel power plant
2. Hydroelectric power plant
3. Nuclear power plant
4. Steam power plant

Correct answer: 2. Hydroelectric power plant

## Mechanical energy is supplied to a DC generator at rate of 90 J/s. The generator delivers 40 at 85 V. The yearly kWh output of plant is

Mechanical energy is supplied to a DC generator at rate of 90 J/s. The generator delivers 40 at 85 V. The yearly kWh output of plant is:

1. 1013 * 10^6 kWh
2. 763 * 10^6 kWh
3. 513 * 10^6 kWh
4. 263 * 10^6 kWh

Correct answer: 1. 263 * 10^6 kWh

Solution:

Mass of water available = 90 * 1000 = 90000 kg/sec

————

Work done/sec = W*H = 90000 * 40 = 35316 * 10³ W = 35316 kW

This is gross plant capacity.

———————

Firm capacity = Plant efficiency * Gross plant capacity

Firm capacity = 0.85 * 35316 = 262.96644 kW

———————

Output/annum = Firm capacity * Hours in a year

Output/annum = 30019 * 8760 = 263 * 10^6 kWh

## Certain power station has an average demand of 20 MW. If plant capacity factor is 55%. The plant capacity is

Certain power station has an average demand of 20 MW. If plant capacity factor is 55%. The plant capacity is:

1. 21 kW
2. 26 kW
3. 36 kW
4. 46 kW

Solution:

From formula of Plant capacity factor

Plant capacity factor = Average demand/Plant capacity

Plant capacity = Average demand/Plant capacity factor = 20/0.55 = 36 MW

## If load factor of a power plant increases, the cost of power generation per unit will

If load factor of a power plant increases, the cost of power generation per unit will:

1. Increase
2. Remain the same
3. Decrease
4. None of these

## To supply base load of power plant, which of the following powerplant is very suitable

To supply base load of power plant, which of the following powerplant is very suitable:

1. Diesel
2. Nuclear
3. Thermal
4. None of these