TOPIC: BUFFING
DIRECTION: Choose the correct answer from the lettered options.
1. Operation may be done by ________.
i. hand with a stationary polisher
ii. Die grinder
iii. may be automated using specialized equipment
A. i only
B. ii only
C. iii only
D. i, ii and iii
The correct answer is option [D]
2. In buffing, rough abrasives remove imperfections within the metal surface like
________.
i. pit
ii. nicks
iii. lines and scratches
A. iii only
B. i, ii and iii
C. i only
D. ii only
The correct answer is option [B]
3. The sketch below is a metal finishing machine. It is a ________.
A. bench grinder
B. pedestral grinder
C. machine
D. sanding machine
The correct answer is option [C]
4. The sketch below is a metal finishing machine. The part marked Y is the ________.
A. grinding wheel
B. pedestrial grinding wheel
C. wheel
D. sanding wheel
The correct answer is option [C]
5. The compounds which are made into cakes were mixed with _______
TOPIC: CASTING DEFECTS
DIRECTION: Choose the correct answer from the lettered options.
1. Longitudinal facial crack which occurs in continuous casting processes is due to
________.
i. primary uneven cooling
ii. secondary uneven cooling
iii. molten steel poor chemical compositions qualities etc.
A. i only
B. ii only
C. iii only
D. i, ii and iii
The correct answer is option [D]
2. Uneven cooling rates of casting may result in ________.
A. blow holer
B. cold shuts
C. hard spots
D. cracks
E. sponginess
The correct answer is option [C]
3. The defect which occurs when the liquid melt leaks out the mould due to faulty
mould or flask is called _________.
A. drops
B. scabs
C. run out
The correct answer is option [C]
4. Which of these methods of casting does not have a more robust mould?
A. Centrifugal casting
B. Die casting
C. Sand casting
D. Investment casting
The correct answer is option [C]
5. Blowholes are caused by larger gas bubbles due to ________.
i. air entrained in the melt
ii. steam or smoke from the casting sand
iii. gases from the mould
A. i only
B. ii only
C. iii only
D. i, ii and iii
The correct answer is option [D]
6. When moulding sand becomes incorporated into the casting metal, this decreases
the ductility, fatigue strength and fracture toughness of the casting. This defect is
caused by ________.
i. sand with too little strength
ii. fast pouring velocity
iii. under heated molten metal
A. i only
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