Question

1.Which one of the following terms is used to define the identifying letters placed above an input contact in ladder logic?

A. Statement

B. Locator

C. Surname

D. Title

2.Which one of the following statements is true of a disabled contact or coil?

A. A disabled contact or coil is caused by a faulty memory location in the PLC.

B. The disabled element has been automatically disabled due to module failure.

C. A contact must be in the disabled state before it can be forced ON or OFF.

D. The disabled element is held false by the PLC.

3.The register that is assigned to a D/A module in a motor speed control circuit must be assigned to that D/A module. How is this done?

A. By placing the register for the D/A module in a configuration table

B. The registers are previously assigned by the PLC manufacturer.

C. By setting DIP switches

D. By forcing a value into the register

4. What is the name of the nonprogrammable timer that is used to check the internal operation of the PLC?

A. Watchdog

B. System

C. Housekeeping

D. Scan

5. Why are motor current readings from a frequency inverter not exact readings of motor current?

A. Because a frequency inverter adds a DC voltage level to the AC waveform

B. Because the output of a frequency inverter is not a sinewave

C. Because a frequency inverter uses a lower voltage sinewave

D. Because the inverter pulses the motor with various sinewave frequencies

What device on the roll stand machine is used to tell the PLC that the arms have raised to their maximum up position?

A. PS1 B. MS1 C. MS2 D. PX1

Answer 1

1)option B : Locator

2)option A

Due to faults at memory location , the contacts are disabled !!

3)option C

By setting DIP switches

4)option A

Watchdog timers are used to monitor internal operations

5)option B

Output of inverter is not an exact sine waveform

6)MS1/option B