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Millwright Exam – Questions With Complete Solutions
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Millwright Exam – Questions With Complete Solutions
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Millwright Exam – Questions With Complete SolutionsWhat are the 2 classes of hydraulics? ✔️Ans - Hydrostatic &
Hydrodynamic
What causes pressure drop in a hydraulic line? ✔️Ans - Excessive Fluid
Velocity
What causes aeration in a hydraulic pump? ✔️Ans - Air in the suction line
What type of hydraulic cylinder is indicated in the circuit in Figure 1?
✔️Ans - Adjustable cushion on extend only
What is Figure 2? ✔️Ans - Pilot Operated check valve with a 5:1 line to
pilot pressure ratio
What valve is internally piloted from the outlet port and externally
drained? ✔️Ans - Pressure reducing valve
What valve discharges at a preset pressure? ✔️Ans - Pressure Relief Valve
What is the purpose of a pump? ✔️Ans - Create Flow
Which valve limits system pressure when using a fixed displacement
pump? ✔️Ans - Pressure Relief Valve
What is a symptom of a noisy pump? ✔️Ans - Low fluid level in tank
Why can a pressure compensated variable displacement pump work
without a relief? ✔️Ans - It shifts to minimum flow
Where is the main purpose pressure relief valve located in a hydraulic
system? ✔️Ans - Between Pump & control valve
What instruments are used for testing a hydraulic system? ✔️Ans -
Tachometer, flowmeter & pressure guage
What are the brownish deposits found on valve spools? ✔️Ans - varnish
, what is the flare angle for hydraulic tubing that complies with JIC standards
✔️Ans - 37" included angle
What diameter of hose is required for hydraulic hose fittings that has a
dash and number 12 on it? ✔️Ans - 3/4
What is a needle valve normally used for? ✔️Ans - throttling
what is installed when high pneumatic cylinder speeds are required?
✔️Ans - quick exhaust valve
What does figure 3 represent? ✔️Ans - Bidrectional, fixed capacity,
pneumatic motor
What does figure 4 represent? ✔️Ans - Quick Exhaust valve
What is the area of the rod end of the piston when the cylinder has a
diameter of 8" and the rod a diameter of 2" ✔️Ans - 47.10 sq.in.
What is the maximum pressure a transmitter can produce when it has a 10"
diameter low pressure end and a 2" diameter high pressure end and system
pressure relief valve is set to 1000 psi ✔️Ans - 25000 psi
What is the minimum diameter of a cylinder ram when a hydraulic jack
exerts a force of 10 tons and pressure guage reads 2500 psi ✔️Ans -
3.192
What is the average flow rate when an accumulator that holds 3 gallons of
usable oil discharges in 25 seconds? ✔️Ans - 7.2 gpm
What drives the female rotor on a screw compressor? ✔️Ans - timing
gears
When over hauling a dry screw compressor how are the rotor clearance
specifications determined? ✔️Ans - manufacturers manual
What determines the type of air filter used on an air compressor? ✔️Ans
- duty or application
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