Parts Tech 2 Unit 1 Study Questions

Beta rating / ratio measures the tested ability of a filter to keep out particles of a particular size A) True B) False

A

Hydraulic motors are used to convert hydraulic energy into mechanical energy A) True B) False

A

Parts tech A says check valves, relief valves and directional control valves are basic parts in hydraulic systems. Tech B says multiplication of force is an advantage of a hydraulic system. Who is correct A) Both B) Neither C) Tech A D) Tech B

A

Pascals Law is that Force = Area X Pressure. A) True B) False

A

Petroleum based hydraulic fluids are the most common A) True B) False

A

Ported liners use intake ports machined into the side of the cylinder or liner instead of intake valves A) True B) False

A

Pumps create flow, not pressure A) True B) False

A

The 4 types of pressure control valves are: A) relief, reducing, sequencing and unloading B) relief, direct operating, pilot operating, and sequencing C) sequencing, reduced to constant pressure, reduced to fixed amount, and unloading D) check, spool, rotary, flow control

A

The overhead camshaft design: A) Eliminates the need for a pushrod. B) Reduces the length of a push rod. C) Eliminates the need for valves. D) Reduces the size of the cylinder head casting.

A

Fixed displacement pumps take the form or all, except: A) gear pump B) impeller pump C) vane pump D) piston pump

B

Parts tech A says cam follower lifters have no push tube. Tech B says rocker arms are used to change direction of, and transfer motion from the push tube to the valve. Who is correct? A) Neither B) Both C) Tech A D) Tech B

B

Tech A says dynamic seals go between 2 parts that dont move. Tech B says static seals are used to seal 2 parts that dont move. Who is correct? A) Tech A B) Tech B C) Neither D) Both

B

Which is not a type of energy in hydraulics: A) Potential B) Hydrostatic C) Kinetic D) Heat

B

Hydraulic cylinder do everything but: A) covert hydraulic energy into mechanical B) do the work of the hydraulic system C) take my test D) provide linear movement

C

Parts Tech A says disadvantages of hydraulic systems are efficiency, high pressure and leakage. Tech B says disadvantages are need for cleanliness, and noise. Who is correct? A) Tech A B) Tech B C) Both D) Neither

C

Parts tech A says fluids have no shape of their own. Part tech B liquids can transmit and maintain applied force. Who is correct? A) Tech A B) Tech B C) Both D) Neither

C

Parts tech A says the 3 types of pumps are: gear, vane and piston. Tech B says 2 types of piston pumps are axial and radial. Who is correct? A) Tech A B) Tech B C) Both D) Neither

C

Which is not a role of engine cooling: A) remove excess heat from engine B) maintain the most efficient operating temperature C) graduate engine temperature to optimum D) allow engine to reach operating temp as soon as possible

C

All are true of Closed center hydraulic pumps except: A) take a break when oil not required B) no relief valve is used to protect the system C) in neutral, fluid in pump comes to a dead end D) pump continuously produces flow

D

All are types of hydraulic valves except: A) pressure control B) directional control C) flow (volume control) D) none of the above

D

Fire resistance hydraulic fluid can come in form of: A) Emulsions B) Synthetics C) Water-based D) all of the above

D

Parts tech A says cavitation is caused by the addition of air into the cooling system. Parts Tech B says aeration is the formation and collapse of bubbles in coolant. Who is correct? A) Tech A B) Tech B C) Both D) Neither

D

Valve seals control valve guide and stem lubrication to prevent: A) Valve seizure B) Valve stem wear C) Valve guide wear D) Oil consumption

D

You need at least this much to pass A) 65% B) 80% C) 85% D) 70%

D

A modular cylinder block design is used: A) When engine size makes a one-piece block casting unmanageable B) If cast one-piece blocks are unavailable C) When increased block rigidity is necessary D) For most high-speed mobile equipment engines

a

Dry liner has no contact with the engine coolant A) True B) False

a

For every 1lb change is pressure, the boiling point changes 3.25degreess A) True B) False

a

If a piston has a semi-floating piston pin design, the pin is: A) Free to rotate in the piston, but fixed to the piston rod B) Held in the piston by a set if internal snap rings C) Free to rotate in the connecting rod, but fixed to the piston D) Free to rotate in the piston and the connecting rod

a

If a piston has a semi-floating piston pin, the pin is: A) free to rotate in the piston, but fixed to the connecting rod B) held in the piston by a set of internal snap rings C) free to rotate in the connecting rod but fixed to the piston D) free to rotate in both the piston and the connecting rod

a

On a four stroke diesel, the fuel is injected on the compression stroke A) True B) False

a

On the compression stroke, a gasoline engine compresses: A) An air/fuel mixture B) Air only C) Fuel only D) Air at about 9x

a

Parts tech A says the 2 kinds of engine cooling methods are Intercooled and Aftercooled. Tech B says the 2 methods of induction are Naturally Aspired and Mechanically aspired. Who is correct? A) Both B) Neither C) Tech A D) Tech B

a

Removable cylinder liners are used: A) To allow easy replacement of worn cylinder bores B) To repair integral cylinders C) To reduce manufacturing costs D) So that the engine displacement can be easily changed

a

Stroke is the measurement from top dead center to bottom dead center A) True B) False

a

Stroke of the engine is equal to two times the journal offset A) True B) False

a

The term "ENBLOCK" is used to describe a cylinder block that is: A) A one-piece casting B) Manufactured in 2 pieces C) Most often die cast D) Welded steel and forged cast

a

The valve timing of and engine is: A) Built into the camshaft design B) Adjusted at regular intervals C) The same for all engines D) Up to the technician's discretion

a

initial balancing of crankshaft is done during manufacture A) True B) False

a

A 4-stroke cycle engine completes all 4 events in ______ of crankshaft rotation: A) 360 degrees B) 720 degrees C) one revolution D) 4 revolutions

b

A four stroke cycle engine complete all four events in what amount of crankshaft rotation? A) 360degrees B) 720degrees C) one revolution D) four revolutions

b

A typical in-line cylinder block has it's cylinders numbered starting from: A) Flywheel end B) Front of the block C) Camshaft side D) Driver's side

b

An external combustion dissipates approx. 60% of heat developed by combustion through: A) The fuel system B) The cooling and exhaust systems C) A blower fan system D) Block radiation

b

Camshaft lobe is determined by: A) Subtracting the ramp angle from the nose dimension B) Subtracting the base circle diameter from the lobe height C) Subtracting the base circle diameter from the lobe centerline D) Divide lobe height by base circle diameter

b

Crankshafts used in heavy-duty and high-performance engines are usually: A) A one piece casting B) A one piece forged alloy steel C) Multiple-piece construction D) Welded construction

b

Cylinder blocks has its cylinders numbered stating from the: A) Flywheel end B) Front of the block C) Camshaft side D) Crankshaft side

b

Leaking seals on a wet liner cause: A) Excessive liner movement B) Coolant to enter the crank case C) A loss of heat transfer D) A Leaky head gasket

b

Part tech A says removable cylinder liners are used to allow easy replacement of worn cylinder bores. Tech B says leaking seals on a wet liner causes coolant to enter the crankcase. Who is correct? A) Neither B) Both C) Tech A D) Tech B

b

Parts Tech A says wet liners are very thin. Parts Tech B says most liners wear at the top due to lack of lubrication when first starting. Who is correct? A) Tech A B) Tech B C) Neither D) Both

b

Parts tech A says oversized bearing used where block was damaged and got machined. Tech B says undersized bearing used where crankshaft was damaged and machined. Who is correct? A) Neither B) Both C) Tech A D) Tech B

b

RPM in power output of a diesel engine are controlled by regulating: A) air / fuel ratio B) fuel quantity C) air cleaner restriction D) injection timing

b

The RPM and power output of a diesel engine are controlled by regulating: A) The air/fuel ratio B) Fuel quantity C) Air cleaner restriction D) The injection timing

b

The balanced weights used in some 4 stroke engines: A) Absorb and release energy to smooth engine operation B) Counterbalance inertia forces generated by the piston and rod assemblies C) Counterbalance torsional forces generated by the piston and rod assemblies D) Counteract inertia forces generated by the flywheel

b

The crankshaft used in diesel and gasoline engines are usually hardened to improve the characteristics of the: A) Nose B) Journals C) Webs D) Counterweights

b

The part of the cylinder block that contains and supports the crankshaft is the: A) Camshaft bearing bores B) Flywheel housing C) Main bearing bores D) Cylinder bore

b

The purpose of an oil ring expander is to: A) Spread the ring open for installation on the piston B) Provide the ring tension necessary for oil control C) Hold the ring in place during installation D) Allow oil wiped from the cylinder wall to be returned to the oil pan

b

The purpose of cam grinding the skirt of a one piece aluminum piston is to: A) Fit and oval cylinder B) Allow for uneven expansion in the piston pin bore area C) Reduce friction when the engine is cold D) Allow for easier installation of the piston rings

b

The term "Compression Ignition" refers to: A) The method of igniting fuel in a gasoline engine B) The method of igniting fuel in a diesel engine C) Compressing the air/fuel charge in a chamber D) Reduce time for ignition to occur

b

Valve clearance is necessary with "Solid-Type" cam followers to: A) Compensate for normal valve train wear B) Allow for expansion of components as engine temperature increases C) allow for periodic adjustment D) Compensate for valve timing variables

b

Wet cylinder loners: A) Normally have leakage B) Are in direct contact with the coolant C) Depends on block contact for cooling D) Are supported by the block along their entire length

b

Which is not a combustion requirement: A) Fuel B) Stroke C) Air D) Ignition

b

Which is not a type of combustion? A) Normal Combustion B) Hemispherical C) Pre-ignition D) Detonation

b

A 2-stroke cycle engine has a ________ power stroke than a 4-stroke cycle engine: A) Longer B) Greater C) Shorter D) More effective

c

Alloy cast iron is used fir engine block material due to it's: A) Light weight B) Excellent heat transfer properties C) Strength D) High expansion ratio

c

An unbalanced engine would have reduced: A) Torsional vibration B) Inertia forces C) Mechanical efficiency D) Reciprocating forces

c

Chromium plating is used on some compression rings to: A) Reduce the weight of the reciprocating mass B) Decrease heat transfer and increase friction C) Increase heat transfer and reduce friction D) Reduce the engine break-in period

c

Crankshaft fillets have what purpose: A) mounting surface for the flywheel B) counterbalance the mass of the connecting rod journal, piston and connecting rod C) used as a stress relief in a highly loaded areas of crankshaft D) connect the main and rod journals to form throws or crank arms

c

Horsepower is a measurement of: A) Force B) Torque C) The rate of doing work D) Thermal efficiency

c

Horsepower is a measurement of: A) force B) torque C) the rate of doing work D) thermal efficiency

c

Locating lugs and dowels are used to: A) Stop bearing shells from rotating during engine operation B) Index the main caps to the cylinder block C) Position the bearing shells in the bearing bore D) Ensure initial seating of the bearing during assembly

c

Parts tech A says engine bearings must have conformability and embeddability. Tech B says engine bearings must have fatigue and corrosion resistance. Who is correct? A) Tech A B) Tech B C) Both D) Neither

c

Ring groove inserts are used in aluminum piston construction to: A) Prevent the rings from sticking B) Control expansion in the ring grooves C) Reduce wear in and reinforce compression ring grooves D) Increase oil control ring durability

c

The most common material used for diesel engine cylinder head construction is: A) Stainless Steel B) Aluminum Alloy C) Cast Iron Alloy D) Steel Alloy

c

The purpose of a carbon scraper on a valve is to prevent carbon buildup: A) On the valve face B) On the valve seat C) In the lower part of the valve guide D) On the valve stem and fillet

c

The purpose of piston ring end gap is to: A) Permit installation and removal of the rings from the piston B) Allow the ring to conform to the cylinder bore C) Allow clearance for ring expansion D) Leave space for cylinder pressure to act on the compression ring

c

The purpose of the firewall liner is to: A) Protect the liner O-rings from excessive heat B) Act as a combustion seal C) Reduce the heat and pressure acting on the head gasket D) prevent interference between the block and the liner

c

When compared to an integral valve seat, valve seat inserts provide replaceable wear surface with improved: A) Airflow B) Heat rejection C) Wear characteristics D) Sealing characteristics

c

Which is NOT a piston skirt design? A) Full B) Partial Skirt C) Full floating D) All of the above

c

Which of the following describes the term "Engine Displacement": A) Bore times Stroke times # of cylinders B) Mounting restrictions due to size C) piston displacement of one cylinder times the # of cylinders D) The volume of one cylinder

c

A valve spring seat is used to: A) Locate the valve and keep it centered on the guide B) Prevent erosion of the retainer and valve locks C) retrain the valve spring during assembly D) Prevent erosion of the cylinder head where the spring contacts the casting

d

An internal combustion engine converts the heat energy of the fuel into: A) Water vapour B) Useable mechanical energy C) Wasted heat D) Both B and C

d

Bearing markings can be all of the listed, except: A) oversize B) undersize C) standard D) hemispherical

d

Engines may be classified by: A) Cycle and cooling type B) # and arrangement of cylinders C) Operational sped and type of fuel D) All of the above

d

Parts Tech A says bias-cut connecting rods are used only in in-line engines. Tech B says bias-cut are easier to instal into the cylinder bore. Who is correct? A) Tech A B) Tech B C) Neither D) Both

d

Parts tech A says indicated horsepower is the max HP from an engine under ideal conditions. Tech B says Brake Horsepower is the actual horsepower delivered to the rear of the crankshaft. Who is correct? A) Tech A B) Tech B C) Both D) Neither

d

The banks of a "V-type" engine are normally identified as: A) 1 and 2 from the front of the engine B) Upper and lower from the side of the engine C) Front and rear from the side of the engine D) Left and right from the rear of the engine

d

The compression ratio of a diesel engine is: A) About 4 times that of a gasoline engine B) Less than a gasoline engine C) The same as a gasoline engine D) About 2 times a gasoline engine

d

The crankshaft of a 4 stroke cycle engine rotates at____ camshaft speed: A) 1/4 B) 3/4 C) 1/2 D) Twice

d

The cylinder block of an engine: A) Forms a rigid foundation for major components B) Contains passageways for coolant and oil C) Provides a mounting surface for engine accessories D) All of the above

d

The cylinder block of an engine: A) Forms a rigid foundation for major engine components B) Contains passageways for movement of coolant and oil C) Provides mounting surfaces for engine accessories D) All of the above

d

The front and rear crankshaft seals: A) Prevent pressurized oil from entering the crankshaft B) maintain crankshaft pressure C) Control lubrication of the front and rear bearings D) Prevent splash oil from leaking out around the rotating crankshaft

d

The outside diameter of a dry liner must fit the cylinder block bore correctly: A) To protect coolant from leaking into the crankcase B) To allow heat transfer from the liner to the block material C) To support the liner D) Both B and C

d

The outside diameter of a dry liner must fit the cylinder block bore correctly: A) to prevent cooliant from leaking into the crankcase B) to allow heat transfer from the liner to the block material C) to support the liner D) both B & C

d

The term "STROKE" refers to: A) Bore squared times 3.14 B) The distance that the piston moves across the cylinder C) The length of the connecting rod D) The distance the piston moves from TDC to BDC

d

What is one of the fundamental ideas for the operation of an internal combustion engine? A) Compression of air before ignition or self ignition of fuel in highly compressed air B) Need for cylinder wall cooling C) Utilization of wasted exhaust energy D) All of the above

d

Which function of piston rings is a task specific to compression rings? A) control lubrication between piston and the cylinder wall B) help cool the piston by transferring heat to the cylinder wall C) form a gas-tight seal between the piston and the cylinder D) both B & C

d

Which is a major component of the internal combustion engine A) Camshaft and Crankshaft B) Cylinder and Pistons C) Engine Block D) All of the above

d

Which of the following best describes an advantage of the 2-piece piston design: A) The crown and skirt cannot be separated B) Combustion forces are transferred directly to the skirt C) The skirt does not have to absorb any side thrust D) Combustion forces are transferred directly from the crown to the piston pin

d

Which of the following best describes the design of a trunk-type piston A) the crown and skirt can be separated for cleaning B) two-piece construction with a slipper-skirt C) three-piece construction with a full skirt D) crown and skirt are manufactured as one piece

d

Which of the following best describes the design of a trunk-type piston: A) The crown and skirt can be separated for cleaning B) 2 piece construction with a slipper skirt C) 3 piece construction with a full skirt D) The crown and skirt and manufactured as one-piece

d