Electronic Principles
A device that converts thermal energy to electrical energy is called a:

piezoelectric devices
None of these
solar cell
chemical cell
thermocouple

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Electronic Principles
Which one of the following statements most accurately describes the nature of inductive reactance?

None of these
Inductive reactance is another term for counter emf
Inductive reactance is an opposition to current flow in ac circuits
Inductive reactance is a force that tends to overcome the effects of counter emf
Inductive reactance is an opposition to current flow in dc circuits

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

None of these
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
an increase in current through the coil causes no further increase in the mmf
frequent changes in the direction of current through the coil causes heating effects in the core material
the core is permitted to move freely within the coil

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