This set of Casting, Forming and Welding Multiple Choice Questions & Answers (MCQs) focuses on “Visual Inspection”.
1. What does M.F.F.T. stand for?
a) Maximum Flow Filling Temperature
b) Minimum Flow Filling Temperature
c) Minimum Film Forming Temperature
d) Maximum Film Forming Temperature
View Answer
Explanation: M.F.F.T. stands for Minimum Film Forming Temperature, at this temperature, the aqueous polymer bonds with itself. This bonding takes place in a semi dry state to form a continuous film.
2. Which of the following was not a classification of a subject taking the MFFT?
a) Slow accurates
b) Slow in-accurates
c) Fast-Accurates
d) Reflectives
View Answer
Explanation: The subjects on taking the MFFT, the subjects were then classified into four categories namely, fast-accurates, reflectives, impulsives and slow-inaccurates. Slow-accurates was not one of the classifications.
3. Which subject classification of the MFFT has the characteristics, short time spending and high errors making?
a) Fast-accurates
b) Slow-inaccurates
c) Reflectives
d) Impulsives
View Answer
Explanation: According to the subject classification of MFFT, the category of impulsives has the characteristics of spending less time and making more errors.
4. Which subject classification of the MFFT has the characteristics, long time spending and less errors making?
a) Fast-accurates
b) Slow-inaccurates
c) Reflectives
d) Impulsives
View Answer
Explanation: According to the subject classification of MFFT, the category of reflective has the characteristics of spending long time and making less errors.
5. Which subject classification of the MFFT has the characteristics, short time spending and few errors making?
a) Fast-accurates
b) Slow-inaccurates
c) Reflectives
d) Impulsives
View Answer
Explanation: The category of fast-accuratives has the characteristics of spending less time and making few errors, and this is according to the subject classification of MFFT.
6. Which subject classification of the MFFT has the characteristics, long time spending and high errors making?
a) Fast-accurates
b) Slow-inaccurates
c) Reflectives
d) Impulsives
View Answer
Explanation: According to the subject classification of MFFT, the category of impulsives has the characteristics of spending long time and making more errors.
7. Which of the following cannot be detected using visual inspection?
a) Blowholes
b) Crack within the cast
c) Tears
d) Rattails
View Answer
Explanation: Visual inspection can be used for detection of many kinds of defects like cracks, tears, blowholes, rattails, metal penetration, swells, shifts and many more. But for detecting cracks within the cast, visual inspection is not the way.
8. Negative surface irregularities cannot be caused by which of the following factor?
a) Slag inclusion
b) Oxidation pitting
c) Nitride pitting
d) Shrinkage
View Answer
Explanation: For the formation of negative surface irregularities, slag and oxide inclusion, oxidation pitting, gas and shrinkage are very important factors, but not nitride pitting, as it does not cause negative surface irregularity.
9. Positive surface irregularity is caused by excess metal penetration.
a) True
b) False
View Answer
Explanation: During the formation of positive surface irregularity on the casting, an excess amount of metal has to penetrate into the ceramic mold material, or there should be an entrapment from air to liquid next to the pattern.
10. Visual inspection is essentially carried out using a magnifying glass.
a) True
b) False
View Answer
Explanation: Visual inspection can be carried out using various equipment such as Mark 1 eyeball or Mark 0 eyeball. For carrying out visual inspection, detecting defects can be done using the naked eye too.
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