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Exam 10: Electromechanical and Solid-State Relays and Timers

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Question 1

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In ____________________ timers, the contacts stay in their original position until a solenoid plunger has moved through its entire travel distance.

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on-delay on delay time delay on energization TDE

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Mechanical timers use air, a diaphragm, and an operating solenoid to cause a time delay.

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Electromechanical relays, contactors, and motor starters operate by dissimilar principles, as indicated by differences in the amount of current that each associated contact must switch.

SSRs with ____________________ switching capability, used for resistive, inductive, and capacitive loads, are the most commonly used SSRs.

Which switching state is used for heavy industrial loads such as transformer loads?

In general terms, explain one common use for relays.

Briefly describe the use for a mechanical time-clock type of timer.

In reference to an electronic timer, identify the type of timer that cycles its output contact open and closed for preset intervals until the control signal is removed from the input.

A distinguishing feature of a(n) ____________________ is that it has no coil or contacts.

____________________ are devices used to relay or multiply control signals or electrical contact closures.

The SCR conducts when the voltage across it is in the reverse direction, and also conducts in the forward direction when the proper signal (voltage) is applied to the gate terminal

The silicon-controlled rectifier (SCR) is one of the most popular solid-state devices for controlling large and small electrical power loads.

List two attributes of solid-state timers that account for their widespread use.

The action of relay contacts is to switch something "on" or "off " depending on the configuration.

When the coil voltage of the electromechanical relay is separate or different from those at the switched contacts, it is called ____________________.