Class 4 (4th Engineer) MEKM 📅 Jun 2023

Exam Question

(a) In Jerk type Fuel Pump, describe with diagrammatic Sketch how metered quantity of Fuel oil is delivered to cylinder unit? (8)

(b) How is fuel injection timing changed in Jerk type Fuel Pump? (4)

Reference Answer

### (a) Fuel Metering in a Jerk-Type Fuel Pump (8 Marks)
The metered quantity of fuel oil in a Jerk-type fuel pump is controlled by varying the effective delivery stroke of the plunger. This is achieved through the interaction of a plunger with a helical groove, a barrel with ports, and a control rack that rotates the plunger.
**Components:**
* **Plunger:** A precision-machined piston that reciprocates inside the barrel.

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