Multiple Choice Questions UNIT IV

1. PLC means _________ Logic Controller.A]Programmable b]Peripheral c]Periodic

2. HMI means ________ Machine InterfaceA]Human b]Hard c]Heart

3. Unitary PLC has 20 inputs and ___outputs.A]20 b]12 c]10

4. PLCs having less than ______ inputs and outputs are called as Small PLCA]50 b]200 c]100

5. Small PLCs have a memory from ___________ to store the user’s logic programs.A] 2KB to 10KB b] 10KB to 20KB c] 20KB to 30KB

6. Medium PLC have ____________ inputs and outputs.A]4000 to 8000 b] 1000to 4000 c] 100 to 200

7. To protect a PLC from any incoming surges from the field , isolated devices such as _________are used.A]Transformer b]ADC c]Transducer

8. ________ language can be programmed interactively with the PLCA]online b]offline c]Basic

9. ________ language can be generated separately and then downloaded separately in the PC.A]online b]offline c]Basic

10. The__________ instruction is used to turn an output on or off after its timer has been on for a preset time interval.A] Retentive Time b]timer on delay c]Timer off delay