Mechanical Engineering Flashcards
6 cards from real BE/B Eng Bachelor of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Mechanical Engineering flashcards as text
What is the purpose of a Bourdon tube in engineering instruments?
Answer: To measure fluid pressure
A Bourdon tube is a curved metallic tube that straightens under internal pressure, with its deflection used to measure gauge pressure in fluid systems.
In gear systems, the gear ratio is defined as the ratio of the number of teeth on the:
Answer: Driven gear to the driving gear
Gear ratio = teeth on driven gear / teeth on driving gear, and inversely equals the input-to-output speed ratio for a simple gear pair.
Which heat transfer mechanism does not require a medium and can occur in a vacuum?
Answer: Radiation
Thermal radiation transfers energy via electromagnetic waves and requires no medium, making it the only mode that works through a vacuum.
What is the function of a check valve in a hydraulic system?
Answer: To allow flow in only one direction
A check valve (non-return valve) permits fluid flow in one direction only and automatically prevents backflow when downstream pressure exceeds upstream pressure.
In manufacturing, what does CNC stand for?
Answer: Computer Numerical Control
CNC (Computer Numerical Control) uses pre-programmed computer software to control the movement of machine tools like mills, lathes, and routers.
What is cavitation in fluid machinery?
Answer: The formation and violent collapse of vapor bubbles due to local pressure dropping below vapor pressure
Cavitation occurs when local static pressure falls below the fluid's vapor pressure, causing vapor bubbles to form and collapse violently, damaging components.