What will be the DC range in solenoids pneumatic systems?

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ALP CBT 2 Fitter Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. 110 V to 220 V
  2. 220 V to 250 V
  3. 230 V to 440 V
  4. 12 V to 24 V

Answer (Detailed Solution Below)

Option 4 : 12 V to 24 V
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Explanation:

  • A solenoid valve is an electrically activated valve, typically used to control the flow or direction of air or liquid in fluid power systems.
  • Solenoid valves are used in both pneumatic and hydraulic fluid power systems.
  • The plunger slides within a core tube of non-ferrous metal, which itself is surrounded by a coil of electrical windings.
  • The coil can exist as any range of voltage from 12-48 V DC to 110-220 V AC.
  • Solenoid operated valves commonly work at 24 V DC or 110 V 

DC Solenoid

AC Solenoid

It is quieter

Direct operation with line voltage

Less wear of solenoid core

Tendency to hum

High Solenoid holding force

Risk of burn out of the solenoid coil if solenoid core is jammed

Same pick-up and holding power

Faster switching speed than DC solenoids

Simple design (No shading ring required to avoid humming)

 

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