Question

A brazing operation was studied. The operator under the study has performance rating of 110%. The operator took 1 hour to braze 18 joints. If a total of 10% allowances are allowed for the operation. The expected standard production rate of the joints (in units per 5 hour shift) is:

• A. 45
• B. 75
• C. 90
• D. 60

Answer 1

The correct option is B 75

Elemental time for 1 brazing $=\frac{1}{18}hr=\frac{60}{18}min.$

Normal time = Elemental time $\times$ rating factor

$=\frac{60}{18}\times 1.1$

Standard time = Normal time + allowances

$=\frac{60}{18}\times 1.1+\frac{10}{100}\times \frac{60}{18}\times 1.1=4.033min.$

Standard Production rate $=\frac{5\times 60}{4.033}\underset{–}{\sim }75$