Power Generation MCQs Part 23

Contents

- 1 If plant capacity equals the maximum demand, then, the value of load factor
- 2 In hydroelectric power station, the effective head is H meters and rate of waterflow is Q m³/sec. The hydraulic power available in kW is
- 3 Diversity factor * Maximum demand is
- 4 The plant that is free from environmental problems
- 5 In which part of thermal power plant, the steam pressure is less than that of atmosphere
- 6 The load power factor of power plant is

## If plant capacity equals the maximum demand, then, the value of load factor

If plant capacity equals the maximum demand, then, the value of load factor:

- Is less than plant capacity factor
- Is equal to plant capacity factor
- Is more than plant capacity factor
- None of these

Correct answer: 2. Is equal to plant capacity factor

Explanation: Plant capacity Factor = Average demand / Plant capacity

Here plant capacity = Maximum demand

Plant capacity factor = Average demand / Maximum demand

The Average demand equals Load Factor * Maximum demand

Plant capacity factor = (Load factor * Maximum demand) / Maximum demand So Plant capacity factor = Load factor

## In hydroelectric power station, the effective head is H meters and rate of waterflow is Q m³/sec. The hydraulic power available in kW is

In hydroelectric power station, the effective head is H meters and rate of waterflow is Q m³/sec. The hydraulic power available in kW is:

- P = 9.8 QH
- P = 56 QH
- P = 92 QH
- P = 128.5 QH

Correct answer: 1. P = 9.8 QH

Explanation:

P = mgh = mass of water * g * water head

= volume of water in m³ * Density of water * g * H

= Q * 1000 * 9.8 * H watts = 9.8 QH kW

## Diversity factor * Maximum demand is

Diversity factor * Maximum demand is:

- Installed capacity
- Generated power
- Average demand
- Sum of consumer’s maximum demand

Correct answer: 4. Sum of consumer’s maximum demand

## The plant that is free from environmental problems

The plant that is free from environmental problems:

- Diesel engine
- Hydroelectric
- Nuclear
- Steam

Correct answer: 2. Hydroelectric

## In which part of thermal power plant, the steam pressure is less than that of atmosphere

In which part of thermal power plant, the steam pressure is less than that of atmosphere:

- Turbine
- Boiler
- Condenser
- Superheater

Correct answer: 3. Condenser

Explanation: A condenser condenses steam at the exhaust of turbine. This creates low pressure at the exhaust of turbine, thus converting heat energy of steam into mechanical energy.

## The load power factor of power plant is

The load power factor of power plant is:

- Generally equal to 1
- Always less than 1
- Always more than 1
- None of above

Correct answer: 2. Always less than 1