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1A voltmeter uses one scale for three ranges: 0–750, 0–300, and 0–120 V, but the scale is marked only for the 120 V range. On the 750 V range, a reading of 112 corresponds to an actual voltage of:
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2Using autotransformers, a corner-grounded 480 V system supplies a 240 V delta panel carrying 34 kVA. Sizing the transformers no larger than necessary, what is the maximum circuit breaker allowed to protect them?
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3Five 2,500-watt, 208-volt heat strips are on the secondary of a 3-phase 208Y/120-volt transformer. What is the load per phase for each heat strip?
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4A 2,000 sq ft store has a general-lighting load of 3 VA per sq ft. How many 15 A, 120 V branch circuits are required to carry this load?
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5A 150-scale voltmeter has a resistance of 10,000 ohms. The power it consumes when connected across a 100-volt circuit is:
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6Electric-discharge lighting on outdoor poles supplied by circuits over 277 V to ground (but not over 600 V phase-to-phase) must be mounted at least how high above grade or roadway?
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7A capacitor operating over 600 volts nominal must have a means to reduce its residual voltage to 50 volts or less within ____ after being disconnected.
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8A single rod, pipe, or plate electrode that does not have a resistance to ground of ____ or less must be supplemented by one additional electrode.
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9A service with No. 2 service-entrance conductors requires what minimum size grounding electrode conductor?
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10On a 120/208 V, three-phase, 4-wire wye service, a voltage reading taken between any two ungrounded (hot) conductors should be:
