274. Which one of the following is used for preparing porcelain
A. clay
B. feldspar
C. quartz
D. All of these.

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275. Porcelain is used as:
A. sanitary wares
B. electric insulators
C. storage vessels
D. reactor chambers

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276. Pick up the correct statement from the following :
A. The low voltage porcelain is prepared by wet process
B. The high voltage porcelain is prepared by dry process
C. The low voltage porcelain is prepared by dry process
D. None of the above.

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277.  The low voltage porcelain is mainly used for
A. switch block
B. insulating tubes
C. lamp sockets
D. All of these.

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278. The presence of sand in brick earth prevents :
A. cracking of bricks
B. shrinkage of bricks
C. warping of bricks
D. none of these.

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279. In order of increasing percentage of silica, the correct sequence is
A. sandy clay, calcar(tous clay, pure clay
B. calcareous clay, pure clay, sandy clay
C. pure clay, sandy clay, calcareous clay
D. None of these.

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280.  The clay to be used for manufacturing bricks for a large project, is dugout and allowed to weather throughout
A. the monsoon
B. the winter
C. the summer
D. none of these.

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