Power Generation MCQs Part 16
Contents
- 1 The cheapest power plant in terms of operation and maintenance is
- 2 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
- 3 Certain power station has an average demand of 20 MW. If plant capacity factor is 55%. The plant capacity is
- 4 If load factor of a power plant increases, the cost of power generation per unit will
- 5 To supply base load of power plant, which of the following powerplant is very suitable
The cheapest power plant in terms of operation and maintenance is
The cheapest power plant in terms of operation and maintenance is:
- Diesel power plant
- Hydroelectric power plant
- Nuclear power plant
- 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:
- 1013 * 10^6 kWh
- 763 * 10^6 kWh
- 513 * 10^6 kWh
- 263 * 10^6 kWh
Correct answer: 1. 263 * 10^6 kWh
Solution:
Mass of water available = 90 * 1000 = 90000 kg/sec
————
Head = 40 m
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:
- 21 kW
- 26 kW
- 36 kW
- 46 kW
Correct answer: 3. 36 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:
- Increase
- Remain the same
- Decrease
- None of these
Correct answer: 3. Decrease
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:
- Diesel
- Nuclear
- Thermal
- None of these
Correct answer: 1. Diesel
Explanation: Peak load power stations deliver power during a few intervals in the day. Such stations must be put in service very quickly. Diesel power stations can be started and put in service within a few minutes. While thermal power plants take around 4 to 8 hours for start-up. Nuclear power plants can take several days for being in service.