Exam 3: Decimal Fractions

Carry the answer to four decimal places. Determine the circumference (C) of a grinding wheel if the diameter (d) is 12 inches. Use the following formula: C = $20 ^ { \circ }$ d where ${ } ^ { \circ } \mathrm { C } = 5 / 9 \left( {}^ { \circ }F - 32 ^ { \circ } \right)$ = 3.1416

Carry the answer to two decimal places. The values of pieces of electrical equipment are as follows: one 0-150 voltmeter costing $45.50; one 0-10-kilowatt meter costing $165.50; one 0-30 ammeter costing $35.20; one 0-300 voltmeter costing $42.75; one 0-200 millivoltmeter costing $65.38; one 50-ampere shunt costing $9.85; and three 0-5 ammeters costing $45.60 each. Find the total value of these pieces.

Carry the answer to three decimal places. The field current of a motor is 1.12 amperes at no load. However, when the full load is applied, the current increases to 1.87 amperes. What is the difference in amperes from no load to full load?

Carry the answer to four decimal places. The lighting set shown has the same number of volts across each lamp. The sum of all lamp voltages is equal to the total number of volts. Find the number of volts across each lamp.

A contractor pays an electrician $910 per week and a helper $560 per week. If the work week consists of 35 hours, find the cost per hour for labor on a job using two electricians and two helpers.

Carry the answer to four decimal places. The actual inside diameter (10) of a 3-inch conduit is 3.375 inches, and the actual outside diameter (00) is 3.9375 inches. What is the wall thickness of this conduit?

Carry the answer to two decimal places. Six hundred twenty-five watertight screw connectors are purchased for $0.1725 each. Find the total cost.

Carry the answer to four decimal places. How much larger is the diameter of number 11 wire than that of number 16 wire? AMERICAN WIRE GAUGE SIZE NUMBER WIRE DIAMETER IN INCHES 10 0.10190 11 0.09074 12 0.08081 13 0.07196 14 0.06408 15 0.05707 16 0.05082

Carry the answer to four decimal places. If X = 0.9875 inch and Y = 0.675 inch, find W. $I = E / R + r$

What is the resistance of a piece of copper wire that has a size of 2.5 mil-feet if 1 mil-foot has a resistance of 10.4 ohms?

Carry the answer to three decimal places. The dry cells shown add up to a total voltage of 27.5 volts. What is the average number of volts for each dry cell?

Carry the answer to three decimal places. The total current (amperes) is equal to the sum of the individual currents. Find the total current in the figure shown. $X _ { L } = \sqrt { Z ^ { 2 } - R ^ { 2 } }$

Carry the answer to two decimal places. What is the total weight of a container of 7 gallons of liquid insulating material if one gallon weighs 9.36 pounds and the container alone weighs 6.87 pounds?

Carry the answer to two decimal places. What is the total cost to repair an electric outlet if the following materials and labor are required: one shallow box at $0.65, one ; $h p = \frac { \sqrt { 3 } ( E ) (I ) ( E f f ) ( P F ) } { 746 }$ -inch hickey at $0.98, one flush toggle switch at $1.17, and one hour of labor at $65?

Carry the answer to five decimal places. Express the diameter of a $3 /32$ -inch twist drill as a decimal.

When entering a decimal number in a calculator, the whole number to the left of the decimal must be entered first.