Examination Section Test #3

Question 1

(a) What does a unit on the mechanical engineers’ scale represrent?
(b) What does a unit on the on the architects’ scale?

Answer 1

(a) An inch.
(b) A foot.

Question 2

(a) If you were told to make a quarter-size drawing of a machine part, what drafting scale might you use?
(b) A 1/64 reduction of a construction detail?
(c) A chart of a survey?

Answer 2

(a) Mechanical engineers’ scales.
(b) Architects’ scales.
(c) Chain scales.

Question 3

(a) How would you indicate on an engineering drawing a scale of 3 inches to 1 foot?
(b) On an architectural drawing?

Answer 3

(a) 1/4
(b) 3” = 1’-0”

Question 4

How is a mixed number changed to an improper fraction?

Answer 4

The whole number is multiplied by the denominator of the fraction and then added to the numerator to form the numerator or the improper fraction.

Question 5

Before you add or subtract fractions, what must you do with the denominators?

Answer 5

Before you add or subtract fractions , convert all the denominators to a common denominator.

Question 6

What is the rule for multipling fractions?

Answer 6

To multiply fractions , multiply the numerators and the denominators separately.

Question 7

What is the rule for dividing fractions?

Answer 7

To divide fractions , invert the divisor and proceed as in multiplication.

Question 8

How do you reduce a fraction to a decimal?

Answer 8

To reduce a fraction to a decimal, divide the numerator of the fraction by the denominator.

Question 9

Which scales on the slide rule are used in multiplying , dividing, and in solving problems of proportion?

Answer 9

The C and D scales

Question 10

What is a proportion?

Answer 10

A proportion is the equality of two ratios.

Question 11

Why is it useful to remember that the slide rule is based on the principle of proportion?

Answer 11

If you remember that a slide rule is based onthe principle of proportion, you will find it easier to keep from being confused concerning which scale to use in location the answer to a problem.

Question 12

What is the formula for computing the are of a:
(a) Rectangle
(b) Square
(c) Triangle

Answer 12

(a) A = LxW
(b) A= s²
(c) A = 1/2bh.

Question 13

What is the formula for computing the volume of a:
(a) Rectangular solid
(b) Cylinder with a circular base
(c) Cylinder with an elliptical base

Answer 13

(a) V= LxWxH
(b) V= πr²h
(c) V = πabn