TRANSFORMERS, LEVEL II, Lesson 3:
Buck-Boost Transformers questions and
answers
A(n) ? can consist of current transformers wired to sense when an unbalance of 50% or more is
present in the line current. ✔✔fault-sensing system
Which of the following are common methods of sizing a buck-boost transformer? ✔✔I.
Determine the load current and the buck or boost voltage and calculate the required size of the
buck-boost transformer.
II. Determine the load power and calculate the required size of the buck-boost transformer.
(I. and II.)
Buck-boost transformers are typically available in sizes up to ? . ✔✔10 kVA
An overcurrent protection device must be provided to cause the main switch or common
overcurrent protection device to open if the load reaches ? of its rating. ✔✔125%
For buck-boost transformers, the NEC® makes a distinction between those rated at less than ?
and those rated at that amount of current or more. ✔✔9 A
Buck-Boost Transformers questions and
answers
A(n) ? can consist of current transformers wired to sense when an unbalance of 50% or more is
present in the line current. ✔✔fault-sensing system
Which of the following are common methods of sizing a buck-boost transformer? ✔✔I.
Determine the load current and the buck or boost voltage and calculate the required size of the
buck-boost transformer.
II. Determine the load power and calculate the required size of the buck-boost transformer.
(I. and II.)
Buck-boost transformers are typically available in sizes up to ? . ✔✔10 kVA
An overcurrent protection device must be provided to cause the main switch or common
overcurrent protection device to open if the load reaches ? of its rating. ✔✔125%
For buck-boost transformers, the NEC® makes a distinction between those rated at less than ?
and those rated at that amount of current or more. ✔✔9 A
