The purpose of a combiner valve that is used for an excavator hydraulic system it to:
a. increase the main relief pressure for heavy lifting
b. combine the two main pump flows for certain high flow functions c. combine the pilot oil pump with one of the main pump flows
d. combine the bucket and stick circuits for faster digging
D
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A telescopic gauge can be used to measure a cylinder bore if what other measuring device is used to measure the telescopic gauge?
A) Micrometer B) Dial indicator C) Feeler gauge D) Straightedge
Deburring tools are used for:
A) Preparing a compressor head before applying a head gasket. B) Removing the small burr left by pipe cutters. C) Removing splinters from wood frame members. D) Removing rough edges from electrical wiring.
The first law of thermodynamics states that:
A) All objects contain some energy. B) Energy cannot be created or destroyed. C) The molecular energy band is directly proportional to the thermal activity of the molecule. D) Whenever energy is created, an equal quantity of energy must be destroyed to maintain thermal equilibrium.
The plots shown in Figure P4.18 are the voltage across and the current through an ideal capacitor. Determine its capacitance.
