A mortar bed is required under brittle floor coverings, such as ceramic and natural stone floor tiles. What type of mortar is needed under such tiles?
What will be an ideal response?
Mortar provides a cushion under the tiles and also compensates for any variation in tile thickness and unevenness of the subfloor. If the mortar bed is not thick enough to compensate for tile thickness variation and unevenness of subfloor, the tiles will crack or break due to stress concentration under points of unevenness. For small size tiles (up to approximately 24 in. × 24 in.), the variation in thickness or unevenness of the subfloor is small, requiring a
thin-bed mortar.
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In the Unified Soil Classification System, the symbol M stands for
A) medium-grained soil. B) soil of medium plasticity. C) moist soil. D) none of the above.
The following statements are all correct EXCEPT ________
A) When the PCM detects detonation using the knock sensor, it will retard ignition timing. B) The knock sensor may be ignored by the PCM at idle. C) Knock sensors require voltage input from the PCM to function properly. D) Ignition timing may be either ATDC, at TDC, or BTDC.
A good conductor of electricity is said to have ____________________ electrons which can move easily from one atom to another.
Fill in the blank(s) with the appropriate word(s).
What are precast hollow-core decking units and when are they used?
What will be an ideal response?