Question 1

A ____ clock is used in some electronic timers that must be very accurate.&#10;A) quartz&#10;B) neon&#10;C) argon&#10;D) silicon

Accepted Answer

Quartz clocks use a quartz crystal to keep time very accurately, making them ideal for electronic timers that require precision.

Question 2

RC time constants are expensive but relatively accurate.

Accepted Answer

RC time constants are not expensive; they are a simple and cost-effective way to implement timing or filtering functions using a resistor and a capacitor, but their accuracy can be affected by the tolerance of the components used.

Question 3

A ____ added to the circuit allows adjustment of the length of time delay within the limits of the&#160; circuit.&#10;A) static resistor&#10;B) variable resistor&#10;C) static inverter&#10;D) variable diode

Accepted Answer

A variable resistor allows for the adjustment of resistance within a circuit, which can be used to alter the length of time delay by changing the rate at which a capacitor charges or discharges.

Question 4

The time delay for an on-delay timer can be accomplished by several methods: pneumatic, electric&#160; clock, or electronic.

Accepted Answer

On-delay timers can utilize various methods to achieve their time delay, including pneumatic mechanisms, electric clocks, and electronic circuits, each offering a different approach to timing control.

Question 5

Most electronic timers are made to plug into sockets, which makes replacing a defective timer quick&#160; and avoids the necessity of rewiring.

Accepted Answer

Most electronic timers are designed to plug into existing sockets, allowing for easy replacement without the need for complex rewiring.

Question 6

If an on-delay contact has been set for 10 seconds, when the relay has been de-energized the contact&#160; ____.&#10;A) returns to its normally open position immediately&#10;B) returns to its normally open position after 5 seconds&#10;C) returns to its normally open position after 10 seconds&#10;D) returns to its normally open position after 20 seconds

Accepted Answer

An on-delay contact returns to its normally open position immediately after the relay has been de-energized, as the delay applies to the activation, not the deactivation.

Question 7

When an on-delay relay is energized, its contacts remain in their normal position for some length of&#160; time before they change.

Accepted Answer

An on-delay relay is designed to delay its output (the change in contact position) for a preset period after the input (or coil) is energized, keeping the contacts in their normal position during this delay time.

Question 8

Most electronic timers use a(n) ____ to control the time delay.&#10;A) DC time variable&#10;B) RC time variance&#10;C) DC time constant&#10;D) RC time constant

Accepted Answer

Most electronic timers use an RC time constant to control the time delay. This involves a resistor (R) and a capacitor (C) in the circuit, where the time delay is determined by the product of the resistance and capacitance values.

Question 9

When an on-delay relay is de-energized, the contacts return to their normal position after some length&#160; of time.

Accepted Answer

An on-delay relay's contacts return to their normal position immediately when de-energized; the delay only occurs when the relay is energized.

Question 10

When an on-delay contact has been set for 10 seconds, once the normally open relay has been&#160; energized the contact remains open for ____ seconds.&#10;A) 5&#10;B) 10&#10;C) 15&#10;D) 20

Accepted Answer

An on-delay contact set for 10 seconds means that once the normally open relay is energized, the contact will remain open for 10 seconds before closing. This delay allows for controlled timing in circuits where a delay is needed after a signal or power is applied.

Deck 31: The on Delay Timer