Question

30. A 480/240 Volt, Step-down transformer with a primary current of 200 amperes will have an approximate secondary current of ______ amperes.

A. 100

B. 200

C. 300

D. 400

31. The inverter output of a stand-alone photovoltaic system shall be permitted to supply 120 volts to a single-phase, 3-wire 120/240 volt service where there are no _____ on the system.

A. Motors connected

B. Transformers connected

C. Multi-wire branch circuits

D. Appliance branch circuits

32. When a combination transformer and utilization equipment are supplied by a feeder are 600 volts the conductor ampacity shall be not less than sum of the nameplate rating of the transformers and the equipment that will be operated. Simultaneously at _____ percent.

A. 75

B. 100

C. 125

D. 150

33. When sizing the branch circuit of a 50-gallon fixed storage-type water heater, the load shall be considered _____.

A. Periodic

B. Continuous

C. Intermitted

D. Non-continuous

34. A 20-ampere breaker should be used to protect a maximum heating load of ____ amperes.

A. 10

B. 12

C. 16

D. 20

35. Where a 15-ampere circuit breaker supplies two or more receptacles, the maximum permissible load on any receptacle is ______ amperes.

A. 7.5

B. 10

C. 12

D. 15

36. Given: Five 20-volt branch circuits each draw 2 amperes. What is the total power, in volt-amperes?

A. 10

B. 40

C. 120

D. 200

Answer 1

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