What are valve seats?
What will be an ideal response?
A valve seat is the sealing surface for the valve face.
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A varying speed is usually preferred for ____.
a. water pumps b. cranes and hoists c. turret lathes d. paper and printing plants
"Lame-duck" President James Buchanan asserted following the presidential election of 1860 that
A. southern states had a legal right to secede from the Union. B. southern states did not have any legitimate political or economic grievances against the northern states. C. the election of 1860 was a fraud. D. southern states had no choice but to secede from the Union. E. southern states could not legally secede under the Constitution, but was unable to find the presidential authority under the Constitution to use American armed forces to prevent the seven southern states that had voted for secession from doing so.
L-shaped and U-shaped stairs have a ____ at the change in directions.
A. nosing B. balustrade C. landing D. newel post
Which of the following statements is TRUE about these systems?
A) The R-22 system can operate at twice the suction line pressure drop of the R-410a system. B) The R410a system can operate at half the suction line pressure drop of the R-22 system. C) The R-22 system can operate at the same suction line pressure drop of the R-410a system. D) The R-410a system can operate at twice the suction line pressure drop of the R-134 system.