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.