How can the magnetism produced by a flowing electrical current be intensified enough to produce useful work?
A) Pass the magnetic field through a magnetic force field amplifier.
B) Reduce the amount of current traveling through the wire.
C) Coil the conductor around a core of soft iron or steel.
D) Use a conductor with a current gap to create higher current levels.
[Ques. 2] A micron is a unit of length equal to:
A) 1/1,000 of a meter. B) 1/1,000 of a millimeter.
C) 1/1,000 of a inch. D) 1/1,000 of a kilometer.
[Ques. 3] In an AC inductive circuit:
A) Current leads voltage. B) Voltage leads current.
C) The voltage and current are in phase. D) Voltage lags current.
[Ques. 4] How should the vacuum gauge and vacuum pump be connected to a four-port manifold?
A) The vacuum gauge is connected to the 3/8-in center port, and the vacuum pump is connected to the 1/4-in center pump.
B) The vacuum gauge is connected to the evaporator coil, and the vacuum pump is connected to the discharge service valve.
C) The vacuum gauge is connected to the 1/4-in center port, and the vacuum pump is connected to the 3/8-in center pump.
D) The vacuum gauge is connected to the discharge service valve, and the vacuum pump is connected to the evaporator coil.
[Ques. 5] The main operating principle of transformers is:
A) Magnetic transformation. B) Magnetic induction.
C) Transductive voltage amplification. D) Transductive current amplification.
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