CPT Electrical & Mechanical Fundamentals 3

Question 1

Which lubrication method delivers a metered, continuous supply of oil to bearings during machine operation?

Accepted Answer

Centralized oil mist system

Answer

A centralized oil mist system atomizes oil and delivers it continuously through distribution lines to multiple bearing points simultaneously.

Question 2

What electrical safety device automatically opens a circuit when current exceeds a predetermined level and must be manually reset?

Accepted Answer

Circuit breaker

Answer

A circuit breaker trips (opens) on overcurrent and can be manually reset after the fault is cleared, unlike a fuse which must be replaced.

Question 3

In mechanical power transmission, what is 'backlash' in a gear set?

Accepted Answer

The clearance between mating gear teeth

Answer

Backlash is the play or clearance between meshing gear teeth, necessary to allow for lubrication and thermal expansion but excessive backlash causes noise and inaccuracy.

Question 4

A three-phase motor has its rotation reversed by:

Accepted Answer

Swapping any two of the three power leads

Answer

Swapping any two of the three phase conductors reverses the phase sequence, which reverses the direction of the motor's rotating magnetic field and shaft rotation.

Question 5

What is the function of a pneumatic FRL unit (Filter-Regulator-Lubricator) in a compressed air system?

Accepted Answer

Condition air by removing moisture/contaminants, regulating pressure, and adding lubrication

Answer

An FRL unit conditions compressed air by filtering out particles and moisture, regulating pressure to the required level, and adding a fine oil mist for tool/actuator lubrication.

(CPT) Certified Production Technician Practice Test

(CPT) Certified Production Technician Practice Test

CPT Electrical & Mechanical Fundamentals 3