Power Generation MCQs Part 19
Contents
- 1 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
- 2 A factory is located near waterfall where the usable head for power generation is 30 m. The river flow is 10 m³/sec. If plant efficiency is 80%, the power developed is
- 3 Usually the load factor is:
- 4 The base load power station supplies load for a day
- 5 In interconnected grid system, the diversity factor of whole system
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
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 kW
- 76.3 kW
Correct answer: 3. 64.3 kW
Solution:
Annual load factor = 101.35 * 10^6/(18 * 10^3 * 8760) = 0.642 = 64.3kW
A factory is located near waterfall where the usable head for power generation is 30 m. The river flow is 10 m³/sec. If plant efficiency is 80%, the power developed is
A factory is located near waterfall where the usable head for power generation is 30 m. The river flow is 10 m³/sec. If plant efficiency is 80%, the power developed is:
- 2154.4 kW
- 2254.4 kW
- 2354.4 kW
- 2364.4 kW
Correct answer: 3. 2354.4 kW
Solution:
Discharge (Q) = 10m³/sec
Water head (H) = 30 m
η(overall) = 0.8
——————
Wt of water available/sec (W) = 10 * 1000 * 9.81 = 98100 N
——————
Power developed = W * H * η (overall) = 2354.4 * 10³ = 2354.4 kW
Usually the load factor is:
Usually the load factor is:
- Less than 1
- More than 1
- Equal to 1
- None of these
Correct answer: 1. Less than 1
Explanation: Load factor is mathematically defined as:
Load factor = Average load / Maximum demand
The average load is always smaller than maximum demand, so, load factor is always smaller than 1.
The base load power station supplies load for a day
The base load power station supplies load for a day:
- 5 hours
- 12 hours
- 18 hours
- 24 hours
Correct answer: 4. 24 hours
In interconnected grid system, the diversity factor of whole system
In interconnected grid system, the diversity factor of whole system:
- Increases
- Decreases
- Remains constant
- None of these
Correct answer: 1. Increases
Explanation: The interconnected grid system is defined as the system having several generation stations or units connected in parallel. Load curves of different interconnected stations are generally different. As a result of this maximum demand on system is much reduced as compared to sum of individual maximum demands on different power stations. Simply, saying the diversity factor of system increases.