Question 1

Sequence control can be achieved by several methods.

Accepted Answer

Sequence control can be achieved by several methods such as relay logic, programmable logic controllers (PLCs), and computer-based systems.

Question 2

What kinds of machines use sequence control? Give at least one example.

Accepted Answer

Sequence control is used by such machines as hydraulic presses that must have a high pressure pump operating before they can be used, or by air conditioning systems that require that the blower be in operation before the compressor starts.

Question 3

Circuits that permit the automatic starting of motors in sequence are rare.

Accepted Answer

Circuits that permit the automatic starting of motors in sequence are actually quite common in industrial and manufacturing settings. These circuits are often used to ensure that motors start up in a specific order, helping to optimize the overall efficiency of the system.

Question 4

Figure 12-2
 
-In the circuit shown in the figure above, what prevents motor #2 from starting before motor #1?

Accepted Answer

The answer of Figure 12-2
 
-In the circuit shown in...

Question 5

Some circuit requirements may demand that the motors turn off in sequence. What does such a circuit require?

Accepted Answer

The answer of Some circuit requirements may demand that the...

Question 6

____________________ forces motors to start or stop in a predetermined order.

Accepted Answer

The answer of ____________________ forces motors to start or stop...

Question 7

Figure 12-4
 
-The circuit shown in the accompanying figure permits ____________________ motors to start in sequence.

Accepted Answer

The answer of Figure 12-4
 
-The circuit shown in the...

Question 8

Figure 12-6
 
-In the circuit shown in the figure above, what happens when the STOP button is pressed?

Accepted Answer

The answer of Figure 12-6
 
-In the circuit shown in...

Question 9

How do automatic sequence control circuits which sense motor current work?

Accepted Answer

The answer of How do automatic sequence control circuits which...

Question 10

In a circuit in which three motors turn off in sequence, an overload on any one motor will not have an effect on the other motors.

Accepted Answer

In a circuit where motors are interconnected, an overload on one motor can affect the overall circuit performance, potentially causing voltage drops or triggering protective devices that could impact the operation of the other motors.

Question 11

The addition of two ____________________ make it possible to start motors in sequence from #1 to #3 with a time delay between the starting of each motor as well as stopping the motors in sequence from #3 to #1 with a time delay between the stopping of each motor.

Accepted Answer

The answer of The addition of two ____________________ make it...

Question 12

Normally open auxiliary contacts that control the starting sequence are often called permissive contacts because they permit action to take place.

Accepted Answer

Permissive contacts allow for the starting sequence to occur, so they are also known as permissive contacts.

Question 13

In the circuit shown in the accompanying figure, motor #3 starts five seconds after motor #____________________ starts.

Accepted Answer

The answer of In the circuit shown in the accompanying...

Question 14

Most ladder diagrams show coils connected in parallel.

Accepted Answer

Ladder diagrams typically show coils connected in series with their controlling devices, not in parallel. This arrangement allows for the sequential control of circuits.

Question 15

In the circuit shown in the accompanying figure, timer coil TR1 is connected in ____________________ with the 1M starter coil.

Accepted Answer