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单选题
Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid （） pressure.
A
depending on
B
in relative to
C
regardless of
D
because of
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depending onB
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Rotary pumps occupy only one-half the space of reciprocating pumpsD
Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump
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单选题Positive displacement, helical gear pumps are well suited for pumping oil because （）A
stuffing boxes eliminate the leakage problems usually associated with other gear pumpsB
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单选题Gear pumps are （） because they discharge a near constant amount of liquid regardless of pressure.A
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turbine typeC
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单选题Which of the listed pumps is NOT a positive displacement pump?（）A
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（1）and（2）B
（1），（2）and（3）C
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（2）and（3）
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Engine room persons should stop their pumps in machinery space.B
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单选题Gear pumps are （） type because they discharge a near constant amount of liquid regardless of pressure.A
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low dischargeC
low speedD
high pressure
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grinding the spare plunger to the barrelB
replacing the plunger and the barrelC
highly polishing both the plunger and barrelD
replacing plunger only
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