Question 1

Solid-state relays can be used to control either a DC load or an AC load.

Accepted Answer

Solid-state relays are versatile in their ability to control both DC and AC loads.

Question 2

All relays use opto-isolation to control the output.

Accepted Answer

Opto-isolation is not the only method used to control relay outputs. Other methods include magnetic and solid-state relays, which do not use opto-isolation.

Question 3

The solid-state relay is a device that has become increasingly popular for ____.&#10;A) heating applications&#10;B) DC applications&#10;C) switching applications&#10;D) blending applications

Accepted Answer

Solid-state relays are commonly used in switching applications, as they can control high voltage and current levels without mechanical components. They are often used in industrial applications to control motors, heaters, and other high-power equipment.

Question 4

Many solid-state relays have a feature known as zero switching.

Accepted Answer

Zero switching helps to reduce radio frequency interference (RFI) and voltage spikes by switching the relay only when the AC voltage crosses zero volts. This reduces the stress on the relay and makes it more reliable.

Question 5

The control voltage for most solid-state relays ranges from about ____.&#10;A) 1 to 16 volts&#10;B) 2 to 24 volts&#10;C) 3 to 32 volts&#10;D) 4 to 36 volts

Accepted Answer

The control voltage for most solid-state relays ranges from about 3 to 32 volts. This range is standard for most SSRs and is commonly used in industrial and automation applications.

Question 6

Some solid-state relays are designed to be used as ____.&#10;A) time-delay relays&#10;B) neutral relays&#10;C) biased relays&#10;D) polarized relays

Accepted Answer

Solid-state relays can be designed to include time delay functionality, allowing them to switch on or off after a set amount of time. They are not designed to be neutral, biased or polarized relays.

Question 7

Solid-state relays intended for use as AC controllers have a ____ connected to the load circuit in place of a power transistor.&#10;A) diac&#10;B) sidac&#10;C) thyristor&#10;D) triac

Accepted Answer

Triacs are commonly used in solid-state relays for AC control because they can switch both halves of the AC waveform and are able to latch on once triggered. Diacs and sidacs are not commonly used as switches in AC controllers, and thyristors only switch one half of the waveform.

Question 8

The relays that use optical coupling are referred to as being ____.&#10;A) light-induced&#10;B) opto-isolated&#10;C) magneto-isolated&#10;D) zero switched

Accepted Answer

The relays that use optical coupling are referred to as being opto-isolated. Optical coupling refers to the use of light to transmit signals between the input and output of the relay, providing electrical isolation between the two circuits. This isolation can prevent interference and damage from voltage spikes or surges. The term "opto-isolated" emphasizes the use of optical coupling to achieve this isolation. None of the other answer options accurately describe relays that use optical coupling.

Question 9

Small reed relays are probably the most common method for controlling a solid-state relay.

Accepted Answer

Small reed relays are not commonly used for controlling solid-state relays since solid-state relays are designed to be driven by low voltage and low current signals, whereas reed relays require higher voltages and currents to operate. Optocouplers or MOSFET switches are commonly used to drive solid-state relays.

Question 10

Solid-state relays are sealed against dirt and moisture.

Accepted Answer

Solid-state relays have no moving parts and are typically sealed against dirt and moisture, making them more reliable and durable in harsh environments.

Deck 24: The Solid-State Relay