Unit 3-4 Lesson 6
Compression-type substation bus connections are applied cold, typically with a compressive force of ? . a. 10,000 psi b. 15,000 psi c. 20,000 psi d. 22,000 psi
A
Exothermic connections used in substations are also called ? . a. Cadweld b. Coldweld c. Hotweld d. Permaweld
A
Filler wire used for aluminum bus welding in substations must be ? . a. aluminum 4043 alloy b. bi-metal 601 aluminum c. bi-metal solder d. stainless steel welding filler
A
In order to warm up a torque wrench, a suitable bolt is clamped in a vise and an even pull is applied to the wrench handle until it clicks. Repeat this procedure ? times. a. 10 b. 12 c. 15 d. 20
A
The proper torque for a 1/2-inch silicon-bronze bolt is ? . a. 10 ft-lbs b. 40 ft-lbs c. 60 ft-lbs d. 80 ft-lbs
B
When making bolted connections with 3/8-inch galvanized bolts, the proper torque is ? . a. 10 ft-lbs b. 25 ft-lbs c. 40 ft-lbs d. 55 ft-lbs
B
When using an aluminum pipe bus in a substation, if permitted by the specifications, a ? drain hole may be drilled in the bottom of each pipe, centered on each span between bus supports. a. 1/8" b. 1/4" c. 3/8" d. 1/2"
B
A welded substation bus connector eliminates conductor ? . a. corrosion b. expansion and contraction c. hot spots d. oxidation
C
In a substation, the minimum clearance between lines rated 50 kilovolts or below and any part of a crane or load shall be ? . a. 6' b. 8' c. 10' d. 11.5'
C
When making an aluminum-copper connection, the copper component is installed below the aluminum component to prevent ? . a. corona fault lines from forming b. heat from affecting the aluminum conductor c. the copper salts from washing onto the aluminum d. voltage surface creepage
C
Aluminum substation buses are welded using a(n) ? or ? unit. a. ARC / Heat b. Cadwell / Powder c. TIC / MIC d. TIG / MIG
D
In order to properly torque aluminum bolts when making connections, the bolts must be ? . a. clean and dry b. coated with joint compound c. ionized d. lubricated
D
Normally, the lift capacity of a self-propelled articulating boom unit is ? . a. 250 lbs b. 300 lbs c. 400 lbs d. 500 lbs
D
When a copper conductor is connected to a flat copper terminal, a(n) ? terminal lug is used. a. aluminum b. bi-metal aluminum c. compression only d. copper or electrical bronze
D
Aluminum bolts can be reused after they have been torqued if there is no visible damage to the threads. Select one: True False
False
An exothermic connection is applied with a hydraulic press. Select one: True False
False
Exothermic connections in substations are exclusively used on the ground grid. Select one: True False
False
When installing bolted connections, if the surfaces are tin or silver-plated copper, they must be cleaned well with a wire brush. Select one: True False
False
When storing a torque wrench, it must be at its highest setting in order to keep tension on its internal parts. Select one: True False
False
