Exam 3: Decimal Fractions

Carry the answer to five decimal places. A carbon brush measures $23 / 32$ inch thick and 1 $~ ~ 15 / 32$ inches wide. It is to have a copper plating on all sides 0.015 inch thick. What will be the finished thickness in decimal form of the brush with the copper plating?

Carry the answer to three decimal places. A power company charges a city $1.2167 per street lamp per month. There are 1,125 street lamps supplied with current. What is the city's power bill per year for the street lamps?

Carry the answer to four decimal places. If D=3.1875 inches and E=0.5625 inch, find C.

Carry the answer to four decimal places. If A= 0.3125 inch, B= 0.500 inch, and C=1.062 inches Find D. $R _ { T }$

Carry the answer to five decimal places. A meter is to be bolted to a switchboard. The meter studs that will fit into the holes on the switchboard are 0.4365 inch in diameter. Express the hole sizes in decimal form if they are to be $1 /32$ inch larger in diameter than the studs.

Carry the answer to four decimal places. The total current in the diagram divides at point A. How much current exists at point B? $E = P / I$

The electrician uses the following amounts of 1-inch EMT conduit: 22.5 feet, 8 feet, 30.25 feet, and 816.75 feet. Find the total amount of EMT used.

The thickness of insulation between the copper conductor and the iron core of a motor armature are 0.002 inch of enameled insulation, 0.006 inch of cotton insulation, 0.010 inch of slot insulation, and 0.008 inch of varnished cambric insulation. Find the total thickness of insulation.

Carry the answer to two decimal places. An electrician receives $787.50 for a 35-hour week. What is his rate of pay per hour?

Carry the answer to five decimal places. A carbon brush measures $23 / 32$ inch thick and \ (1~ ~ ~15 / 32\) inches wide. It is to have a copper plating on all sides 0.015 inch thick. What will be the finished width in decimal form of the brush with the copper plating?

Carry the answer to three decimal places. If W=3.000 inches, Y=1.750 inches, and Z=0.875 inch, find X. $E _ { C }$

Carry the answer to two decimal places. What is the tax bill for a contractor if his shop has an assessed valuation of $35,000, and the tax rate is $27.50 per thousand dollars of assessed valuation?

Carry the answer to four decimal places. If A= 0.375 inch, B=0.923 inch, C=1.0992 inches, find G $R _ { T }$

Carry the answer to four decimal places. A shim is made 0.0025 inch thick. The thickness should be 0.00225 inch. Find the difference in the thickness. $P = E ^ { 2 } / R$

Carry the answer to two decimal places. A contractor requires the following for a job: BX cable, $32.65; conduit pipe, $12.56; toggle switches, $24.45; and octal boxes, $7.50. What is the total cost?

Mixed number format: 10 $\theta = 360 t _ { i } f$ (Use a space between the whole number and the numerator.) Simple fraction: $4 / 5$ Reduce to lowest form. A piece of 0.0625-inch-thick copper is used to make a sleeve for a joint. What is the thickness of this material expressed as a fractional part of an inch?

Carry the answer to two decimal places. What is the cost of 1,250 feet of cable at $23.25 per one hundred feet?

Carry the answer to two decimal places. What is the total thickness of insulation between the copper conductor and the iron core of a motor armature if there is 0.003 inch of enameled insulation, 0.065 inch of cotton insulation, 0.015 inch of slot insulation, and 0.007 inch of varnished cambric insulation?

Carry the answer to two decimal places. Find the total weight of a 52-gallon steel drum and its contents if it contains 52 gallons of varnish weighing 8.16 pounds per gallon. The drum alone weighs 37.5 pounds.

Carry the answer to three decimal places. Standard 1-inch conduit has an inside diameter of 1.575 inches and an outside diameter of 1.825 inches. Find the thickness of the wall.