This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Automatic Inspection Machines”.
1. Which of the following is not true about automatic inspection machine?
a) Human intervention is required to judge the quality
b) Consists a logic system
c) Self diagnostic system is present
d) Microprocessors are present
View Answer
Explanation: Automatic inspection machines are very economical in high production manufacturing facilities for final inspection. Human intervention is not required to judge the quality. One or more measuring stations are required for the inspection of parts.
2. What is not a use of rocker-arm components in automatic gauging system?
a) Amplify motion
b) Enable probe to reach very difficult areas
c) Enable positioning of part
d) Transfer movement from datum through not more than one pivot points
View Answer
Explanation: Rocker-arm components could be used for more accuracy to transfer movement from the datum through one or more pivot points to the probe. Advantage of such a system amplifies the motion, enables probe to areas which are difficult to reach, and enables positioning of part.
3. Which of the following is true about the self-diagnostic system present in automatic inspection machines?
a) Increase downtime
b) Easy but slow identification
c) Improved efficiency of maintenance
d) Increase settling time
View Answer
Explanation: Self-diagnostic systems are used in automatic inspection machines and these systems allow easy and fast identification of circuits which are faulty, reducing downtime and improving maintenance efficiency.
4. What is done to avoid out-of-sequence mishaps in automatic inspection machine?
a) Clamping between centres and sequence of part lifting are linked on different controls
b) Clamping between centres and gauge fixtures are linked on different controls
c) Sequence of part lifting and gauge fixtures are linked on different controls
d) Sequence of part lifting, clamping between centres and gauge fixtures are linked on same controls
View Answer
Explanation: To avoid out-of-sequence mishaps, clamping between centres, the sequence of part lifting and the gauge fixtures moving down and up, etc. are linked by a single control mechanism. All movements of the gauge structures are cam operated in each gauging station and powered by a electric motor reducer.
5. Which of the following is true about probes used in automatic inspection machines?
a) Retractable type
b) Non-retractable type
c) Auxiliary probe is not used
d) Heads of probes are not held back till the part is in gauging position
View Answer
Explanation: The probes should be made retractable type as far as possible, to prevent possible damage and wear to the probes. The probe heads are held back till the part is in a position of gauging.
6. Which of the following statement is true for automatic inspection machines?
Statement 1: Measurement information is displayed on the screen.
Statement 2: Bad parts are not segregated automatically.
a) T, F
b) F, F
c) F, T
d) T, T
View Answer
Explanation: Bad parts or faulty parts are segregated and discharged into the reject chute. This is done to avoid any possibility of using them in a final assembly. Automatic or semi-automatic mastering of the system is present in automatic gauging machine and is easily performed.
7. Why retooling is fast and less expensive in automatic inspection machines?
a) Only hardware changes are needed
b) Both hardware and software changes are needed
c) No hardware changes are needed
d) Software program doesn’t need any change
View Answer
Explanation: Retooling is fast and not much expensive because no hardware changes are required and the software program is able to achieve these. Electronic gauging machines provide information that can be interfaced with computers or CRT or analysers.
8. Which of the following is true about the design of structure of automatic inspection machine?
a) Separate structure is designed for transportation and gauging system
b) Same structure is designed for transportation and gauging system
c) Anti vibration mounts are placed only one leg of gauging structure
d) Anti vibration mounts are placed only on two front legs of gauging structure
View Answer
Explanation: The design of structure of the machine is to be completely separate for the transportation system and also separate for the gauging system. Anti-vibration mounts are used on each of the supporting leg of the structure of gauging. These are used to insulate the gauging fixture from any possible vibrations.
9. Which of the following option is true for given statements about automatic inspection machines?
Statement 1: Safety devices are incorporated to avoid damage to the gauging fixture.
Statement 2: Gauging devices entering the part is positively pushed.
a) T, T
b) T, F
c) F, T
d) F, F
View Answer
Explanation: The gauging devices entering the part should be spring loaded into their proper position and not positively pushed. If excessive force is needed anywhere then the further operation is stopped to avoid damage.
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