Download Ramsay Maintenance Test (MRA) Study Guide with 132 Practice Questions and Correct Answers and more Exams Mechanical Engineering in PDF only on Docsity!
Ramsay Maintenance Test (MRA) Study
Guide with 132 Practice Questions and
Correct Answers
The best way to protect a pressure gauge from pressure surges is by A. installing a shutoff valve. B. disconnecting the gauge. C. installing a plug valve. D. using a snubber with the gauge. - โ
D. using a snubber with the gauge. Hydraulic lines should NEVER be constructed of A. galvanized pipe. B. Teflon-lined hose. C. tubing. D. black steel pipe. - โ
A. galvanized pipe. The purpose of a bypass line around a system filter is to A. regulate pressure. B. allow passage of flow in case of emergency. C. offer less resistance to flow than bushings. D. require less space than bushings. - โ
B. allow passage of flow in case of emergency. If a cylinder has an input pressure of 50 psi and the BLANK SIDE of the piston is 5 sq. inches, how much total force is applied by the piston? A. 5 lbs. B. 10 lbs. C. 50 lbs.
D. 250 lbs. - โ
D. 250 lbs. A 40% pressure drop across an oil filter screen indicates that the A. screen is broken. B. line pressure is too low. C. screen is dirty. D. line pressure is too high. - โ
C. screen is dirty. An air-breather is installed on a fluid reservoir to A. allow overflow. B. cool the oil. C. vent the reservoir. D. control air pollution. - โ
C. vent the reservoir. Which best describes the piston surface area of a single-rod, double-acting piston? A. Spring-loaded B. Unequal C. Equal D. Balanced - โ
B. Unequal What kind of valve allows flow in only one direction? A. Needle B. Check C. Gate D. Globe - โ
B. Check
C. receiver. D. Compressor. - โ
B. Atmosphere. In troubleshooting a pneumatic system, you should first check A. the air supply. B. the solenoid valve. C. for blown fuses. D. For leaking cylinders. - โ
A. the air supply. The speed of a piston is determined by the A. amount of metered outlet air. B. size of the piston. C. size of the solenoid valve. D. Limit switch. - โ
A. amount of metered outlet air. The safe operating speed of an air motor is controlled by the A. load. B. speed reducer. C. regulator D. Limit switch. - โ
A. load. Install an air lubricator in a pneumatic system A. before the separator. B. after the regulator. C. before the regulator. D. After the separator, but before the regulator. - โ
B. after the regulator.
Post heating welded metals A. eliminates adhesions. B. prevents oxidation. C. provides more ductility. D. avoids stresses from quick cooling. - โ
C. provides more ductility. Before opening the tank valve on an oxygen cylinder which is connected to an oxyfuel cutting torch, you should turn the diaphragm screw A. all the way out. B. 12 of the way out. C. 2/3 of the way out. D. all the way in. - โ
A. all the way out. An advantage of brazing over welding is that with brazing, A. dissimilar metals can be joined. B. a hotter flame may be used. C. no flux is used. D. the fusion is better. - โ
A. dissimilar metals can be joined. Metallic electrodes for steel alloys should contain A. alloys approximately the same as those of the base metal. B. alloys in addition to those of the base metal. C. no alloys. Any good mild steel rod is satisfactory. D. one of any of the alloys of the base metal. - โ
A. alloys approximately the same as those of the base metal.
A. the rail of the crane runway. B. the structural member on which you are welding. C. any nearby steel part of the truck assembly that will carry the ground. D. the collector rails. - โ
B. the structural member on which you are welding. The primary purpose of peening as welding progresses is to A. condition the surface for further welding B. relieve stresses C. clean the scale from the weld. D. Eliminate pores. - โ
B. relieve stresses What is the maximum safe pressure you can have on the low-pressure side of a fuel gas regulator? A.10 psig B. 15 psig C. 25 psig D. 30 psig - โ
B. 15 psig Gas torch tips are usually numbered 0 to 15. The larger the number, the A. greater the tip angle. B. smaller the tip orifice. C. larger the tip orifice. D. longer the tip stem. - โ
C. larger the tip orifice. A drive sprocket has 15 teeth, and the driven sprocket has 60 teeth. The driven sprocket is damaged and must be replaced, but you only have a 48-tooth sprocket. How many teeth should be on the drive sprocket to maintain the same speed on the machine? A. 12
B. 16
C. 20
D. 190 -
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A. 12
In what kind of a properly lubricated bearing is there no metal-to-metal contact while the shaft is rotating? A. Needle bearing B. Ball bearing C. Journal bearing D. Roller bearing - โ
C. Journal bearing Which of the following can transfer power between two turning shafts located at right angles? A. Spur gears B. Worm gears C. Rack and pinion gears D. Herringbone gears - โ
B. Worm gears The best way to keep dirt out of a bearing is to use A. a seal. B. a cap. C. a shield. D. packing. - โ
A. a seal. An overload on a torque limiter will most likely cause A. the motor to kick out. B. a bent shaft. C. increased motor torque.
An EP grease would be best suited for which of the flowing? A. High speed, low pressure B. High speed, low temperature C. Low speed, low pressure D. Low speed, high pressure - โ
D. Low speed, high pressure The viscosity of an oil is affected most by A. contamination. B. resistance to corrosion. C. pressure. D. temperature. - โ
D. temperature. Good lubricating oil must A. Be moist and toxic B. Prevents rust and corrosion C. Be clear in color D. Be readily water soluble - โ
B. Prevents rust and corrosion What is the most important quality of oil film lubrication? A. Separates moving surfaces - โ
A. Separates moving surfaces A gear pump positive displacement pump is also known as a A. Reciprocating pump B. centrifugal pump C. Rotary pump D. Turbine pump - โ
C. Rotary pump
In a centrifugal pump, "cavitation" can result in A. a slight increase in discharge pressure. B. a general improvement in pump performance. C. a reduction in pump net positive suction head requirements. D. pitting of the impeller. - โ
C. a reduction in pump net positive suction head requirements. The chemical being pumped determines the required A. casing materials. B. impeller speed. C. casing size. D. impeller size. - โ
A. casing materials. In dealing with pumping, the term "static head" means the A. energy demanded by piping system to overcome Friction loss. B. kinetic energy in a flowing liquid. C. vertical distance in feet from liquid level in suction tank to point of free discharge. D. gauge reading at pump suction plus velocity head. - โ
C. vertical distance in feet from liquid level in suction tank to point of free discharge. Dowl pins are place in the end caps of pump casing to maintain proper A. Gear-end pump clearance B. Meshing of gears C. bearing placement D. Alignment - โ
D. Alignment A positive displacement pump is a pump that A. has positive, unlimited suction capabilities.
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D. Schedule 120 In piping, the designation "250 lb" refers to a fitting's A. material composition. B. weight per section. C. safe pressure rating. D. support capacity. - โ
C. safe pressure rating. Pipe joint compounds are used to A. lubricate threads when joining. B. fuse fittings. C. make gaskets. D. seal flanged joints. - โ
A. lubricate threads when joining. Which of the valves listed can best be used for throttling? A. Plug cock B. Butterfly C. Gate D. Globe - โ
D. Globe The frequency of operation of a steam trap is governed by A. an automatic timing device. B. the amount of condensate formed in the line. C. the steam pressure in the line. D. the size of the steam line. - โ
C. the steam pressure in the line. It is good practice to put slope in steam line installations because it
A. eliminates condensate pockets. B. decreases the resistance to steam flow. C. Prevents strain due to expansion. D. allows for expansion. - โ
A. eliminates condensate pockets The point at which a pry bar pivots is called its A. lever. B. fulcrum. C. pinch point. D. hinge point. - โ
B. fulcrum. A ladder should be set at what fraction of its length from the object being climbed? A. 1/ B. 1/ C. 1/ D. 3/4 - โ
A. 1/ Before cutting a cable, the cable must be A. seized. B. cleaned. C. stretched. D. kinked. - โ
A. seized. To lift a heavy load without tipping, fasten the hoist A. above the center of gravity. B. in the middle. C. at one end.
If a 20-tooth sprocket turns at a speed of 10 rpm, how Many rpm will a 10-tooth sprocket turn when driven by the Same chain? A. 100 B. 20 C. 10 D. 5 - โ
B. 20 In what way does a resisting force always act in relation to an applied force? A. Perpendicular B. Equal and opposite C. Parallel D. On a slant - โ
B. Equal and opposite Piece of information needed to calculate the force that A hydraulic cylinder can exert is the A. diameter of inlet pipe. B. piston stroke. C. flow rate. D. hydraulic pressure (psi). - โ
D. hydraulic pressure (psi). What tap is best to start cutting a thread in a piece of metal? A. Centering tap B. Plug tap C. Taper tap D. Bottoming tap - โ
C. Taper tap What coupler would allow the greatest flexibility?
A. Rigid shaft coupler B. Chain coupling C. Gear coupling D. Rubber gear coupling - โ
D. Rubber gear coupling Safe operating speed for a grinding wheel is determined by the A. material being ground. B. ambient temperature. C. maximum rpm of the grinder. D. diameter of the wheel. - โ
D. diameter of the wheel. If you are going to drill and tap a ยฝ" bolt hole to bolt a machine part to a heavy cast iron housing, what kind of Thread should you use? A. National fine B. Acme C. Square D. National coarse - โ
A. National fine Which of the following tools could be used to check shaft or coupling alignment? A. Transit B. Calipers C. Micrometers D. Straightedge and thickness gauge - โ
D. Straightedge and thickness gauge What tap is best to cut threads near the bottom of a blind hole? A. Centering tap B. Plug tap
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C. Premixer As flow increases across an orifice plate, the differential pressure developed A. decreases logarithmically. B. increases linearly. C. increases as a square function. D. remains constant. - โ
C. increases as a square function. All fires require a source of A. hydrogen. B. oxygen. C. nitrogen. D. heat. - โ
D. heat. Perfect combustion will take place when the right amount of fuel is combined with what gas? A. Carbon B. Oxygen C. Hydrogen D. Nitrogen - โ
B. Oxygen How many BTU's are there in a therm of natural gas? A. 97, B. 100, C. 97,560, D. 102,500,000 - โ
B. 100, The quantity of heat necessary to raise one pound of water one degree Fahrenheit is
A. a calorie. B. a BTU. C. a therm. D. Celsius. - โ
B. a BTU. A synchronous motor controller will start the motor as an induction motor and then A. bring it into synchronization using DC excitation. B. run it as a synchronized DC motor. C. synchronize the stator with the line frequency. D. synchronize the power factor and frequency. - โ
D. synchronize the power factor and frequency. A wound-rotor motor is always started with A. no external resistance in the rotor circuit B. a starting or auxiliary winding. C. all the external resistance in the rotor circuit. D. any external resistances open-circuited. - โ
C. all the external resistance in the rotor circuit. Dynamic braking is used to A. regulate the speed of a motor. B. mechanically slow the motor down. C. electrically retard or stop a motor. D. derate a motor's horsepower. - โ
C. electrically retard or stop a motor. What causes the current to decrease as an induction motor accelerates? A. Internal resistance B. External resistance C. Stator winding
