Electrical Engineering Control System

Electrical Engineering Control System

Control System

All Cap Name: Test 1 Fall 2021

1. What is a control relay?

A. A remotely operated switch.

B. A device that has a DPST internal relay system.

C. A device used to release relays.

D. A device to control all relays in a PLC.

2. How many words are assigned to a timer element?

A. One.

B. Three.

C. Two.

D. Four.

3. What sensor measures the value when touching the product?

A. Temperature sensor.

B. Proximity sensor.

C. Limit switch.

D. Relay weight sensor.

4. Which of the following is not a component of electromagnetic relay?

A. Electromagnet.

B. Contacts.

C. Coil.

D. Module.

5. What does the term XIO stand for in a PLC scan?

A. Examine if open.

B. Normally open.

C. Examine if closed.

D. Normally close.

6. Which of the following is the proper bit addressing for a single output in a SLC 500?

A. O:3/1.

B. 0:3/1.

C. O3/1.

D. I:3/1.

7. Which one of the following statements describes the status of CR1, M1, and SV1 if PB1 is pushed, and LS1 is closed?

A. CR1 IS OFF, M1 is OFF, and SV1 is open.

B. CR1 IS ON, M1 is OFF, and SV1 is close.

C. CR1 IS ON, M1 is ON, and SV1 is open.

D. CR1 IS OFF, M1 is OFF and SV1 is close.

7. What is the file address for a timer?

A. I:1.

B. O:1.

C. T:1.

D. T:4.

8. Select the statement that correctly describes the following main program.

A. The subroutine executes one time when I:1/0 goes from true to false.

B. The subroutine executes one time when I:1/0 goes from false to true.

C. The subroutine executes continuously while I:1/0 is true.

D. The subroutine executes continuously if I:1/0 and B3:0 are true.

9. What is the bit pattern in the Destination?

A. 11101011.

B. 11101011.

C. 10100010.

D. 01001001.

10. The memory size of a double word is ________.

A. eight bytes

B. eight bits

C. four bytes

D. sixteen bits

11. The address for bit 10 in word 5 for the SLC 500 is ________.

A. B:3.5/10

B. B3:10/5

C. BIT:3.10/5

D. B3:5/10

12. The XIC (examine if closed) instruction _____.

A. is an input instruction only used for field devices with NO contacts

B. has the following logic symbol : (-| |-)

C. has the following logic symbol : (-|/|-)

D. can only be assigned an input file address starting I:

13. The scan time ________.

A. is usually never over 1 millisecond

B. starts with the last rung and works up to rung 0

C. is constant for all programs regardless of length

D. determines how fast an output actuator will respond after a change in an input filed device

14. The order of operation for a program scan is ________.

A. check ladder input logic; read inputs; update input register; update output register; update

outputs

B. read inputs; check ladder input logic; update input register; update output register; update

outputs

C. read inputs; update input register; check ladder input logic; update output register; update

outputs

D. read inputs; update input register; check ladder input logic; update outputs; update output

register

15. What combination of input instructions is needed for the output X to be TRUE?

A. A, B, and G true.

B. A and G true.

C. A and C true.

D. A, G, and C true.

16. What combination of input instructions is needed for the output Y to be TRUE?

A. D and E false.

B. K, D, and F true.

C. K, H, and F true.

D. K and H true and F false.

17. In the ladder below, the valve on push button is a NO momentary switch and Valve off push

button is a NC momentary switch. Which statement below is true?

A. The Valve solenoid is on after the Valve on switch is pressed and released and is turned

off when the Valve off switch is pressing.

B. The Valve solenoid is off while the Valve on switch is held down and Valve off is not

pressed.

C. The Valve solenoid is on after the Valve on switch is pressed and released while the Valve

off switch is held down.

D. The Valve solenoid is on while the Valve on switch is held down and Valve off is held

down.

18. What is the file address for a timer?

A. I: 1.

B. O:1.

C. T:1.

D. T:4.

19. The OTE output instruction is ________.

A. true, activated if the rung link to the left is true

B. not reset to a false state when the rung link to the left is false

C. assigned either the (-(U)-) or the (-(L)-) output symbols

D. a retentive type output

20. A TON timer rung is active and the ACC value is less than the PRE value, so ________ timer bits

are true.

A. both the TT and DN

B. both the EN and TT

C. only the EN

D. only the TT

21. A TOF timer rung is false and the ACC value is less than the PRE value, so ________ timer bits

are true.

A. both the EN and TT

B. only the DN

C. both the TT and DN

D. only the TT

22. Identify the true statement for this timer circuit 25 seconds after the NO selector switch connected

to terminal 1 in module 1 is turned on.

A. I:1/1 is false.

B. O:3/0 is false.

C. DN is true.

D. The EN bit is false.

23. Identify the true statement for this timer circuit 25 seconds after the NO selector switch connected

to terminal I:3/6 is turned off.

A. EN is true.

B. I:3/6 is true.

C. TT is false.

D. O:2/1 is true.

24. What is the unique ability of a RTO timer?

A. It can be reset automatically.

B. RTO combines timers.

C. RTO is used in every program.

D. RTO does not reset the accumulator.

25. Which counter bit is only true when the ACC value is equal to or greater than the PRE value?

A. UN.

B. OT.

C. DN.

D. CU.

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