Answer the following statement(s) true (T) or false (F)
1. A 460/115/230 transformer may be connected for two ratios: 460/115 or 230/115.
2. For subtractive polarity, the voltmeter reading (V) is less than the applied voltage.
3. If a 460/115/230-volt, single-phase transformer is to be connected to obtain 460/230 volts, the two secondary coils must be connected in parallel.
4. Taps are arranged in increments of 2.5% or 5% of the primary nominal voltage rating of the transformer.
5. Regulation of constant potential transformers is about 10-25% at the secondary terminals.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
5. FALSE
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In 1831, Cyrus McCormick developed which of the following agricultural implements?
a. Wheat reaper c. Gasoline-powered tractor b. Steel plow d. Moldboard plow
Answer the following statement(s) true (T) or false (F)
Insulation is usually installed before drywall and mechanical devices.
Why should the technician check the furnace door safety switch after installation?
A) To check the furnace interior for defects in the outgoing vents B) To sync it with the indoor blower C) To test for furnace flashback D) To prevent the furnace from operating with the door removed
Broken rods, broken valve plates, broken valves, and broken crankshafts are symptoms of what type of mechanical failure?
A) High-discharge temperature B) Oil dilution C) Flooding D) Liquid slugging