1. which of the following mathematical computations is wrong?\na. (56 - 19) + 16 = 53\nb. (57 - 20) + 17 =…

1. which of the following mathematical computations is wrong?\na. (56 - 19) + 16 = 53\nb. (57 - 20) + 17 = 54\nc. (58 - 21) + 18 = 55\nd. (58 - 22) + 19 = 56\n2. a 3/32\ diameter electrode is equivalent to:\na. 1.6 mm\nb. 2.4 mm\nc. 3.2 mm\nd. 4.0 mm\n3. the tensile strength of a e7018 electrode.\na. 70000 psi\nb. 70000 cfh\nc. 70000 g/in²\nd. 70 kg/in²\n4. which of the following materials will not conduct flow of electricity?\na. iron powder\nb. aluminum foil\nc. wet safety shoes\nd. none of the above\n5. the primary purpose of insulation in welding cables is to\na. protect the wire from deterioration from the sun\nb. provide flexibility\nc. provide strength\nd. prevent electrocution

1. which of the following mathematical computations is wrong?\na. (56 - 19) + 16 = 53\nb. (57 - 20) + 17 = 54\nc. (58 - 21) + 18 = 55\nd. (58 - 22) + 19 = 56\n2. a 3/32\ diameter electrode is equivalent to:\na. 1.6 mm\nb. 2.4 mm\nc. 3.2 mm\nd. 4.0 mm\n3. the tensile strength of a e7018 electrode.\na. 70000 psi\nb. 70000 cfh\nc. 70000 g/in²\nd. 70 kg/in²\n4. which of the following materials will not conduct flow of electricity?\na. iron powder\nb. aluminum foil\nc. wet safety shoes\nd. none of the above\n5. the primary purpose of insulation in welding cables is to\na. protect the wire from deterioration from the sun\nb. provide flexibility\nc. provide strength\nd. prevent electrocution

Answer

Explanation:

Step1: Calculate each option in question 1

  • Option A: $$(56 - 19)+16=37 + 16=53$$
  • Option B: $$(57-20)+17=37+17 = 54$$
  • Option C: $$(58 - 21)+18=37+18=55$$
  • Option D: $$(58 - 22)+19=36+19=55\neq56$$

Step2: Convert inches to millimeters in question 2

We know that (1) inch ( = 25.4) mm. For a (\frac{3}{32}) inch diameter electrode: $$\frac{3}{32}\times25.4=\frac{76.2}{32}=2.38125\approx2.4) mm

Step3: Recall tensile - strength unit in question 3

The tensile strength of an E7018 electrode is measured in psi (pounds per square inch), and (7018) means the tensile strength is (70000) psi

Step4: Analyze conductivity in question 4

  • Iron powder and aluminum foil are metals and conduct electricity. Wet safety shoes can also conduct electricity due to the presence of water (which can have ions)

Step5: Understand insulation purpose in question 5

The primary purpose of insulation in welding cables is to prevent electrocution. While it may have some secondary effects like protection from the sun (but not the main purpose), flexibility and strength are not the main functions of insulation

Answer:

  1. D. ((58 - 22)+19 = 56)
  2. B. (2.4) mm
  3. A. (70000) psi
  4. D. None of the above
  5. D. prevent electrocution