Mechanical Engineering Department JF 608: Quality Control

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JF608 QUALITY CONTROL

TOPICS : Basic Statistic & Basic Quality Concept

CLO 1 : Express the relation of statistics and quality management system in

understanding the principles and concept of quality control and their application tools.

Part A (Theory)

1. Describe the meaning of Quality control and Zero Defects (4 marks)

2. Explain the FIVE (5) basic concept of Total Quality Management. (5 marks)

3. List THREE (3) categories of inspection and eleborate each of them (6 marks)

Part B (Calculation)

1. The following data shows the length of products obtained from a sample of a population.

26 47 40 34 43 30 53 22 38 32

35 32 40 23 44 37 27 40 52 61

20 34 60 44 38

Based on the data:

i. Build a frequency distribution table consisting of the class data, frequency,

class boundary and class midpoint.

(8 marks)

ii. Find the range of the grouped data

(2 marks)

iii. Find the mean of the grouped data

(4 marks)

iv. Find the standard deviation of the grouped data (5 marks)

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Mechanical Engineering Department JF 608: Quality Control

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2. In a manufacturing steel industry, steel rods are produced through the pultrusion process.

The average of steel rod diameter is 3.20 cm and standard deviation is 0.05 cm. The

acceptance level is 3.20±0.06 cm. Based on this case, sketch and label a normal curve.

(1 marks)

Calculate:

i. The percentage of rejected rods. (1 marks)

ii. The percentage of the rods reworked. (2 marks)

iii. The percentage of accepted rods. (2 marks)