Exam Question
With reference to the construction of a turbocharger, sketch and describe
(a) The rotor bearing and its method of lubrication (6)
(b) Labyrinth seal and explain how such a seal works. (6)
(c) Impeller and diffuser (4)
Class 4 (4th Engineer)
MEKM
📅 May 2023
Reference Answer
### (a) Turbocharger Rotor Bearing and Lubrication (6 Marks)
#### 1. Construction and Types
Turbocharger rotors are supported by bearings designed to withstand extreme rotational speeds (up to and exceeding 100,000 RPM) and high temperatures. The two primary types used are:
* **Plain Journal Bearings:** Predominantly used in modern, large, slow-speed and medium-speed engine turbochargers. They are typically of a 'fully floating' or 'semi-floating' bush design.
#### 1. Construction and Types
Turbocharger rotors are supported by bearings designed to withstand extreme rotational speeds (up to and exceeding 100,000 RPM) and high temperatures. The two primary types used are:
* **Plain Journal Bearings:** Predominantly used in modern, large, slow-speed and medium-speed engine turbochargers. They are typically of a 'fully floating' or 'semi-floating' bush design.
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