CAD/CAM and CNC
JKSSB Junior Engineer (Mechanical) · Industrial Management and CAD/CAM · 34 practice questions with answers and explanations: 4 Easy, 30 Medium, 0 Hard.
Sample questions
Sample Easy question 1
CNC stands for:
- continuous numerical control
- central numerical control
- computer network control
- computer numerical control
Show answer
Answer: D. A computer is part of the machine control unit.
Sample Easy question 2
CAD stands for:
- computer-aided design
- computer-assisted drilling
- central automatic design
- computer-aided drawing only
Show answer
Answer: A. It uses a computer to create and modify designs.
Sample Easy question 3
CAM stands for:
- central automatic machining
- computer-aided marketing
- computer-aided manufacturing
- computer-aided maintenance
Show answer
Answer: C. It uses computers to plan and control production.
Sample Medium question 4
The feedback device in a closed-loop CNC system is used to:
- clamp the work
- supply coolant
- compare the actual position with the commanded position
- change the tool
Show answer
Answer: C. Encoders or resolvers are typical sensors.
Sample Medium question 5
An open-loop NC system uses a:
- stepper motor with no position feedback
- servo motor with feedback
- induction motor only
- hydraulic cylinder with feedback
Show answer
Answer: A. It is simple and cheap but less accurate.
Sample Medium question 6
The Cartesian coordinate system used in CNC machines has:
- three mutually perpendicular axes X, Y and Z
- only one axis
- two parallel axes
- four equal axes
Show answer
Answer: A. The Z axis normally lies along the spindle axis.