Power Transmission and Drive Systems Flashcards
6 cards from real Millwright Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Power Transmission and Drive Systems flashcards as text
What is the primary purpose of a V-belt drive in industrial machinery?
Answer: To transmit power between shafts using friction between the belt and sheave grooves
V-belt drives transmit power through friction between the trapezoidal belt and the angled grooves of the sheave.
When installing a roller chain drive, the maximum allowable sag for a horizontal chain is typically:
Answer: 1–2% of the center distance
Horizontal roller chains should have approximately 1–2% sag of the center distance to allow for thermal expansion and prevent over-tensioning.
A gear ratio of 4:1 means the output shaft turns:
Answer: One revolution for every four revolutions of the input shaft
A 4:1 gear ratio means the output shaft completes one revolution for every four revolutions of the input shaft, reducing speed and increasing torque.
What type of coupling is best suited for connecting two shafts with significant angular misalignment?
Answer: Gear coupling
Gear couplings can accommodate angular, parallel, and axial misalignment, making them suitable for applications with significant angular misalignment.
Which belt drive arrangement is used to reverse the direction of the driven shaft?
Answer: Cross belt drive
A cross belt drive (also called a crossed belt) causes the driven shaft to rotate in the opposite direction of the driver shaft.
When aligning a sheave on a shaft, which tool is most commonly used to check alignment between two sheaves?
Answer: Straight edge or laser alignment tool
A straight edge placed across the faces of both sheaves (or a laser alignment tool) is used to verify coplanar alignment and prevent premature belt wear.