Unit 2-2 Lesson 10
On a fully loaded 25 kVA transformer, the drop leads would normally be ? stranded copper. a. #4 b. #2 c. 2/0 d. 3/0
B
In order for a single-phase transformer to produce any secondary voltage, the X2 grounding strap must be in place. Select one: True False
False
One requirement of the 1996 Migratory Bird Treaty Act regarding new transformer installations to protect birds from electrocution is to ? . a. install bushing covers b. install cross arm covers c. post warning signs d. use only fiberglass insulator pins
A
A popsicle stick connector is a(n) ? terminal connector that is squeezed onto the end of the wire and inserted into the secondary terminals of a transformer. a. aluminum b. braided c. pin d. spade
C
If a transformer was ordered 24,940 Grd Y/14,400, the transformer would have ? insulation at the H2 end. a. more b. no c. reduced d. rubber
C
On a transformer with basket terminals, copper leads should be inserted from the ? . a. bottom b. middle c. side d. top
D
While conducting a pre-installation check on a transformer, do not ? unless permission is granted by the employer. a. check primary bushings for cracks b. check the grounding lug c. check the grounding strap d. remove the lid
D
Aluminum triplex itself can be inserted in the transformer lugs. Select one: True False
False
If a transformer nameplate shows 14,400/24,940 Y, it is suitable for a delta connection because it has full insulation ? . a. at the H2 b. at the tank ground c. on the secondary d. on the X2
A
If more than one popsicle stick connector is to be installed in a basket type transformer terminal, ? leads should be brought out to connect the services. a. copper b. insulated c. solid d. stranded
A
A CSP transformer contains a(n) ? and a ? breaker. a. external primary lightning arrestor / secondary b. internal HV fuse / secondary c. internal secondary fuse / primary d. lightning arrestor / primary
B
Another requirement of the 1996 Migratory Bird Treaty Act regarding new transformer installations to protect birds from electrocution is to install ? . a. a line hose at each transformer installation b. insulated transformer leads c. only CSP transformers d. only triplex service wires
B
The proper way to hang a small distribution transformer when power equipment is not available is ? . a. to use a handline on the crossarm b. to use rope blocks, a pole jib, and a sling c. with a bull line and pickup d. with a handline and pickup
B
One factor that affects the mass that may be attached to a pole is the ? . a. anticipated ice loading b. attachment point for the equipment c. class of the pole itself d. prevailing wind direction
C
A transformer with reduced insulation at H2 must have H2 tied to the ? . a. pole ground b. primary lightning arrestor c. secondary X2 bushing d. system neutral
D
According to industry standards, all distribution transformers above 200 kVA and/or 8,600 volts are ? . a. additive b. referred to as substation class c. special ordered d. subtractive
D
If the secondary voltage is listed on a transformer as 120/240 or 240/120, it makes no difference, as both internal secondary coils can be connected in parallel or series. Select one: True False
False
It is good practice to leave an extra length of copper or to curl primary risers from the transformer to the live line in case the lead breaks. Select one: True False
False
OSHA has no requirements concerning how to hook up and lift a load. Select one: True False
False
Transformers on the loading dock can be relied on, so checking the winding continuity of a transformer is not important. Select one: True False
False
