CSLB C-17 Glazing (Trade Exam) — All Questions

A sheet is 72 by 120 inches. Lites are 34 by 50 inches. In straight rows in either orientation, how many lites come from one sheet?

• a.5 lites
• b.6 lites
• c.3 lites
• d.4 lites✓

The first layout gives 2 across (72 ÷ 34) by 2 down (120 ÷ 50) for 4, and the rotated layout gives 1 across by 3 down for 3. Six would need three lites across 72 inches, which does not fit, and five would need a layout that neither orientation has room for.CSLB C-17 study guide 13E-17 (job-related calculations)

Lites of 18 by 24 inches are cut from a 60-by-80-inch sheet in straight rows, either orientation. How many fit on the sheet?

• a.8 lites
• b.10 lites
• c.9 lites✓
• d.12 lites

The first layout gives 3 across (60 ÷ 18) by 3 down (80 ÷ 24) for 9, and the rotated layout gives 2 by 4 for 8. Twelve would need four lites across 60 inches at 18 inches each, which does not fit, and ten needs a tenth lite that neither orientation has room for.CSLB C-17 study guide 13E-17 (job-related calculations)

A sheet costs $240 and yields 6 lites. What is the glass cost of one lite?

• a.$24
• b.$6
• c.$40✓
• d.$4

240 ÷ 6 = $40 per lite. The 6 is the number of lites, $4 divides by 60 instead of 6, and 24 shifts the decimal.CSLB C-17 study guide 13E-17 (job-related calculations)

A job costs $12,000. What is the price at a 15% markup?

• a.$12,180
• b.$13,800✓
• c.$14,118
• d.$13,500

Markup is on cost, so 12,000 × 1.15 = $13,800. The $14,118 is the price for a 15% margin, $12,180 adds 1.5 percent, and $13,500 adds 12.5 percent.CSLB C-17 study guide 13E-17 (job-related calculations)

A job is priced at $9,000 and the margin is 20 percent of the price. What is the cost?

• a.$7,200✓
• b.$10,800
• c.$11,250
• d.$7,500

The margin is 20 percent of price, so cost is 9,000 × 0.80 = $7,200. The $7,500 divides the price by 1.20 as if it were a markup, $11,250 divides the price by 0.80, and $10,800 adds the margin to the price.CSLB C-17 study guide 13E-17 (job-related calculations)

A job costs $5,000 and the price is $6,250. What markup does that represent?

• a.125 percent
• b.20 percent
• c.25 percent✓
• d.12.5 percent

Profit is $1,250 and 1,250 ÷ 5,000 = 25 percent of cost. Twenty percent is the margin on price, 12.5 percent halves the markup, and 125 percent is the price as a percentage of cost.CSLB C-17 study guide 13E-17 (job-related calculations)

A job costs $8,000 and the price is $10,000. What margin does that represent?

• a.20 percent✓
• b.25 percent
• c.125 percent
• d.80 percent

Profit is $2,000 and 2,000 ÷ 10,000 = 20 percent of price. Twenty-five percent is the markup on cost, 80 percent is the cost share of the price, and 125 percent is the price as a share of cost.CSLB C-17 study guide 13E-17 (job-related calculations)

A contractor wants a 25 percent margin on a $15,000 cost. What price is needed?

• a.$3,750
• b.$18,750
• c.$19,000
• d.$20,000✓

Price is cost ÷ (1 − 0.25) = 15,000 ÷ 0.75 = $20,000. The $18,750 is a 25 percent markup, $3,750 is 25 percent of cost, and $19,000 is a guess.CSLB C-17 study guide 13E-17 (job-related calculations)

Four glaziers work an 8-hour day at $55 per hour each. What is the labor cost for the day?

• a.$1,760✓
• b.$7,040
• c.$440
• d.$220

4 × 8 × 55 = $1,760. The $440 is one glazier for a day, $220 is one glazier for 4 hours, and $7,040 multiplies by four again.CSLB C-17 study guide 13E-17 (job-related calculations)

Material is $3,200, labor $2,400 and equipment $400. Overhead is 10 percent of direct cost and profit is 8 percent of cost plus overhead. What is the price?

• a.$6,480
• b.$7,128✓
• c.$6,600
• d.$7,080

Direct cost is $6,000, overhead is $600, cost plus overhead is $6,600, profit is $528, and the price is $7,128. The $7,080 figures profit on direct cost, $6,600 omits profit, and $6,480 adds 8 percent to direct cost with no overhead.CSLB C-17 study guide 13E-17 (job-related calculations)

A two-person crew sets 6 lites per day. How many working days does a 45-lite job take?

• a.15 days
• b.9 days
• c.8 days✓
• d.23 days

45 ÷ 6 = 7.5, and a partial day is a working day, so 8. 9 adds a spare day, 15 treats the crew rate as per person, and 23 divides by two instead of six.CSLB C-17 study guide 13E-17 (job-related calculations)

Installing a lite takes 0.75 labor hours and there are 60 lites. Labor is $60 per hour. What is the labor cost?

• a.$3,600
• b.$270
• c.$2,700✓
• d.$45

60 × 0.75 = 45 hours, and 45 × 60 = $2,700. The 45 is hours, $3,600 uses a full hour per lite, and $270 shifts the decimal.CSLB C-17 study guide 13E-17 (job-related calculations)

A horizontal member spans 6 feet. What deflection limit does L/175 give?

• a.About 0.30 inch
• b.About 0.41 inch✓
• c.About 0.25 inch
• d.About 0.125 inch

The span is 72 inches and 72 ÷ 175 = 0.411 inch. The 0.30 inch is the L/240 value, 1/8 inch is the sill-under-glass limit, and 0.25 is not a rule value.Pilkington ATS-192 General glazing guidelines (2013)

A horizontal member spans 16 feet. Using the lesser of L/175 and 3/4 inch, what is the limit?

• a.0.75 inch✓
• b.1.10 inches
• c.0.55 inch
• d.0.125 inch

L/175 gives 192 ÷ 175 = 1.10 inches, which is more than 3/4 inch, so the cap of 3/4 inch controls. The 1.10 ignores the cap, 1/8 inch is another limit, and 0.55 is an 8-foot value.Pilkington ATS-192 General glazing guidelines (2013)

An opening is 30 by 40 inches. What should its diagonals measure?

• a.60 inches
• b.2,500 inches
• c.70 inches
• d.50 inches✓

The diagonal is √(30² + 40²) = √2,500 = 50 inches. The sum of the sides is 70, 60 is twice the short side, and 2,500 is the sum of the squares.CSLB C-17 study guide 13E-17 (measurements and calculations)

An opening's diagonals measure 84-1/4 and 84-7/16 inches. The guideline allows 1/8 inch of difference. What is the result?

• a.It passes, because the difference is under 1/4 inch
• b.It fails, because the difference is 3/16 inch✓
• c.It passes, because both diagonals are over 84 inches
• d.It fails, because the difference is 1/4 inch

84-7/16 minus 84-1/4 is 3/16 inch, which is more than 1/8 inch. A 1/4-inch allowance is not the guideline, the size of the diagonals does not matter, and the difference is not 1/4 inch.Pilkington ATS-192 General glazing guidelines (2013)

Using 25.4 millimeters per inch, what is a 6 mm lite closest to in nominal fractions?

• a.3/8 inch
• b.1/4 inch✓
• c.1/8 inch
• d.6 inches

6 ÷ 25.4 = 0.236 inch, closest to 1/4 inch. One-eighth is about 3 mm, 3/8 is about 10 mm, and 6 inches confuses the units.CSLB C-17 study guide 13E-17 (job-related calculations)

A framing member is 2.5 inches wide. What is that in millimeters?

• a.6.35 mm
• b.0.098 mm
• c.63.5 mm✓
• d.25.4 mm

2.5 × 25.4 = 63.5 millimeters. The 6.35 shifts the decimal one place, 0.098 divides by 25.4 instead of multiplying, and 25.4 is one inch.CSLB C-17 study guide 13E-17 (job-related calculations)

An insulating unit's air space is reported as 13.2 mm. What is that closest to in inches?

• a.1/2 inch✓
• b.1/4 inch
• c.1/8 inch
• d.3/4 inch

13.2 ÷ 25.4 = 0.52 inch, closest to 1/2 inch. A quarter inch is about 6 mm, 3/4 inch is about 19 mm, and an eighth is about 3 mm.CSLB C-17 study guide 13E-17 (job-related calculations)

A 15-foot aluminum member warms by 100°F and the coefficient given is 0.0000128 inch per inch per degree. How much does it grow?

• a.About 0.12 inch
• b.About 0.0023 inch
• c.About 0.23 inch✓
• d.About 0.023 inch

The length is 180 inches and 180 × 0.0000128 × 100 = 0.230 inch. The 0.0023 shifts the decimal down two places, 0.023 shifts it down one, and 0.12 halves the result.CSLB C-17 study guide 13E-17 (job-related calculations)