SAE-A1 Test Prep Program with Dave Hobbs
Starter circuit resistance tests are performed with a(n): Oscilloscope Voltmeter Ammeter Ohmmeter
Voltmeter
During a manifold vacuum test a rapid needle vibration on acceleration is noticed. This can be caused by: A rich air-fuel ratio Weak valve springs A restricted exhaust system Worn valve guides
Weak valve springs
Wheel and the pickup coil can change because of: Worn distributor cap and rotor Incorrect timing advance Worn distributor bushings Incorrect base timing setting
Worn distributor bushings
Two cylinder bore measurements are taken: one perpendicular (at a right angle) to the crankshaft and the other in line with the crankshaft. These two measurements are used to determine: Cylinder out-of-round Cylinder taper Cylinder warpage Cylinder ridge
Cylinder out-of-round
Failure to remove the cylinder ridge before removing the piston and connecting rod assemblies from the engine block can result in: Scored cylinder walls Bent connecting rods Broken piston skirts Damaged piston ring lands
Damaged piston ring lands
Low system pressure on an engine with electronic fuel injection can be caused by all of the following EXCEPT : Defective fuel pump check valve Defective fuel pump Faulty fuel pressure regulator Clogged fuel filter
Defective fuel pump check valve
Which of the following tools will give the most accurate measurements when calculating valve guide wear? Split-ball gauge Inside micrometer Dial indicator Dial bore gauge
Dial bore gauge
Most turbocharger failures are caused by: Excessive high-speed operation Exhaust temperatures too high Operation with leaded gasoline Dirt and contamination
Dirt and contamination
To check base timing on a latemodel computer-controlled engine, it may be necessary to: Bypass the idle air control valve Disconnect the oxygen sensor Disable computer controlled timing Disconnect the throttle position sensor
Disable computer controlled timing
Which of the following circuits is NOT part of the cranking system? Ignition switch Engine speed sensor Starter relay Battery
Engine speed sensor
Which of the following may be a cause of low oil pressure? Worn piston rings Excessive valve guide clearance Excessive main bearing clearance Stretched timing chain
Excessive main bearing clearance
A fluorescent dye test is used to check for: Coolant leaking into the crankcase External coolant leaks Internal oil leaks Combustion leaking into the coolant
External coolant leaks
Which of the following is NOT a typical crankshaft journal wear pattern? End-to-end taper Fillet taper Barrel taper Hourglass taper
Fillet taper
If the block and rods are in good shape, main and rod bearing insert wear will be: In a short arc near the fillet Even across the bearing face Greatest in the center and minimal at the parting line Concentrated on apparently random areas of the bearing faces
Greatest in the center and minimal at the parting line
Press-fit piston pins are installed with about: 0.001 inch of interference 0.001 inch of clearance 0.002 inch of clearance 0.003 inch of interference
0.001 inch of interference
Typical valve guide clearance would be: 0.005 to 0.010 inch 0.002 to 0.005 inch 0.010 to 0.020 inch 0.001 to 0.002 inch
0.001 to 0.002 inch
Typical piston ring end gap for a 3.985-inch diameter piston would be: 0.003 to 0.004 inch 0.012 to 0.016 inch 0.009 to 0.012 inch 0.006 to 0.008 inch
0.012 to 0.016 inch
When tested for one minute at 500 rpm, most mechanical fuel pumps deliver: 1 pint of fuel 1 cup of fuel 1 gallon of fuel 1 quart of fuel
1 quart of fuel
The specific gravity of a fully charged battery with an electrolyte temperature of 80'b0F will be about: 1.225 1.245 1.285 1.265
1.265
Valve margin must be at least: 1/16 inch 1/64 inch 1/8 inch 1/32 inch
1/32 inch
When slow-charging a battery, the electrolyte temperature should not rise above: 115o F 112o F 135o F 125o F
125o F
The most common valve seat angles are: 15º or 30º 45º or 60º 30º or 60º 30º or 45º
30º or 45º
The preferred rate for charging an automotive battery is: 15 to 25 amps Less than 5 amps 5 to 15 amps Less than 20 amps
5 to 15 amps
When doing an engine speed drop test of the PCV system, the engine idle speed should drop by at least: 20 rpm 50 rpm 60 rpm 80 rpm
50 rpm
Residual fuel pressure reads low on an engine with electronic fuel injection. The most likely cause is: A defective fuel pump A faulty fuel-pressure regulator A clogged fuel filter A defective fuel pump check valve
A defective fuel pump check valve
The best repair for an integral valve guide that is worn 0.030 inch beyond specification would be: A coil wire insert Knurling A thin-wall liner A false guide
A false guide
Which of the following tests is NOT used to check the operation of an intake air preheat system? Vacuum diaphragm test A manifold vacuum test Thermostatic bulb test Temperature sensor test
A manifold vacuum test
A cylinder leakage test is being performed on a 4-cylinder engine. When testing the number 2 cylinder, air escapes from the number 3 spark plug hole. Technician A says that a leaking head gasket could be the problem. Technician B says that the number 2 intake valve not seating could be the problem. Who is right? A only B only Both A and B Neither A nor B
A only
Technician A says that it is a good practice to replace torque-to-yield cylinder head bolts with new ones whenever they are removed. Technician B says that torque-to-yield cylinder head bolts can be reinstalled if you torque them to specification, then tighten them an additional 90 degrees. Who is right? A only B only Both A and B Neither A nor B
A only
With the engine running, an engine thump at normal temperature can mean: A restriction in the water jacket A loose drive belt A worn water pump A poor pressure cap seal
A restriction in the water jacket
f0fs24 cf0 Connecting rods are marked: Before removal With a scribe On the bottom of the cap After removal
Before removal
Umbrella-type valve guide seals are installed: Before the spring On the guide With the spring compressed Before the valve
Before the spring
Manifold vacuum, compression, cylinder leakage, and cylinder power balance test results are all within specification, but the engine suffers from high oil consumption, even though the valve guide seals were recently replaced. Technician A says that the problem may be caused by a clogged PCV valve or worn valve guides. Technician B says clogged oil drainback passages or worn pushrod tips can increase oil consumption. Who is right? A only B only Both A and B Neither A nor B
Both A and B
Technician A says a full-floating wrist pin should be checked for clearance fit. Technician B says a press-fit wrist pin should be checked for interference fit. Who is right? A only B only Both A and B Neither A nor B
Both A and B
Whitish-gray ash deposits on the spark plug electrodes are caused by: Retarded ignition timing Burning oil Rich fuel mixture Coolant in the cylinder
Burning oil
Install rods and pistons: Clean and dry By pushing gently with a wooden hammer handle With rod caps reversed By tapping with a ball peen hammer
By pushing gently with a wooden hammer handle
High compression readings, good cylinder leakage test results, and good power balance can be the result of: Exhaust restriction Incorrect valve timing Carbon deposits on the pistons Leaking valve guide seals
Carbon deposits on the pistons
Which of the following operations is NOT required when replacing a cylinder head gasket? Cleaning the bolt holes Checking for leakage Checking for warpage Checking for squareness
Checking for squareness
Valve springs are bench tested for all of the following EXCEPT : Tension pressure Installed height Squareness Free height
Installed height
Which of the following is NOT one of the starting system circuits? Ground circuit Control circuit Isolated circuit Insulated circuit
Isolated circuit
Which of the following methods is NOT used for detecting cracks in a cast-iron cylinder head? Dye penetrant testing Pressure testing Magnetic particle testing Leak-down testing
Leak-down testing
Standard procedure to repair connecting rod big-end bore stretch is to: Hone to oversize Machine back to standard size Bore to oversize Fit undersize bearings
Machine back to standard size
Which of the following signal generating devices produces an alternating current (AC) signal to let the PCM know how fast the crankshaft is turning? Magnetic pulse generator Hall-effect switch Optical sensor All of the above
Magnetic pulse generator
When installing an oil pump, it should be primed with: Assembly lube Petroleum jelly Motor oil High-pressure lubricant
Motor oil
Technician A says that grinding the valve face will increase valve spring installed height. Grinding the valve tip will correct installed height. Technician B says that grinding the valve face will decrease valve spring installed height. Installing shims under the spring will correct installed height. Who is right? A only B only Both A and B Neither A nor B
Neither A nor B
Technician A says that two measurements, end clearance and rotor-to-housing clearance, are taken to evaluate a rotor-type oil pump. Technician B says that three measurements: end clearance, gear-to-gear clearance, and gear-to- housing clearance, are taken to evaluate a gear type oil pump. Who is right? A only B only Both A and B Neither A nor B
Neither A nor B
An oil pressure relief may be located in any of the following locations, EXCEPT: Oil filter flange Timing cover Oil filler neck Oil pump housing
Oil filler neck
To check the boost pressure of a turbocharger, a pressure gauge is installed: On the compressor side of the turbocharger On the turbine side of the turbocharger In the intake air plenum At the wastegate port of the turbocharger
On the compressor side of the turbocharger
The thermostatically controlled air cleaner should: Provide cool air at all times Open the hot air passage during warmup Provide hot air at all times Close the hot air passage during warmup
Open the hot air passage during warmup
Low and steady vacuum gauge readings can be caused by: Piston ring leakage Worn valve guides An incorrect fuel mixture An exhaust restriction
Piston ring leakage
The needle on a vacuum gauge slowly oscillates back and forth when the engine is run at idle. This generally indicates which of the following? Late valve timing Poor air-fuel mixture A blown cylinder head gasket An air leak in the intake manifold
Poor air-fuel mixture
During an oil pressure test, low oil pressure is noted only at low engine speeds, and there are no abnormal engine noises. These findings may indicate: Faulty hydraulic valve lifters Pressure-oiled rocker arm shaft assembly wear Badly worn engine bearings An open oil pump pressure relief valve
Pressure-oiled rocker arm shaft assembly wear
A vacuum gauge is connected to an engine. The gauge reads 18 in-Hg at idle. When engine speed is increased, the gauge momentarily drops to near zero, then slowly rises and stabilizes at 9 in-Hg. The likely cause of these readings would be: Weak piston rings Incorrect fuel mixture Restricted exhaust Retarded ignition timing
Restricted exhaust
In a cylinder compression test, if the compression is low on the first stroke and increases on following strokes but never reaches specifications, it probably means: Rings may be worn or valves may be sticking Cylinder compression is okay Head gasket may be leaking Excessive carbon build-up
Rings may be worn or valves may be sticking
Oil pump tip clearance is the same as: Rotor drop clearance Rotor-to-housing clearance Rotor-to-rotor clearance End clearance
Rotor-to-rotor clearance
Spark plug gap is checked using a: Round wire feeler gauge Flat blade feeler gauge All of the above Non-magnetic feeler gauge
Round wire feeler gauge
Valve spring installed height is measured from? Spring seat to valve tip Valve guide top to valve keeper groove Valve retainer top to valve stem end Spring seat to valve retainer
Spring seat to valve retainer
Checking manifold vacuum with a gauge will reveal all of the following problems EXCEPT : Worn valve guides Exhaust restriction Sticking hydraulic lifter Worn piston rings
Sticking hydraulic lifter
When installing a piston assembly, the notch on the head of the piston will generally face toward: The rear of the engine The major thrust side The front of the engine The minor thrust side
The front of the engine
Which of the following does NOT indicate a bent connecting rod? Wear at opposite ends and sides of the bearing shells Wear along one edge of the bearing shells Uneven side clearance on the piston skirt A diagonal pattern on the thrust face of the piston
Uneven side clearance on the piston skirt
To bleed off excess boost pressure during idle and low speed operation, most supercharger engines use a(n): Electric cut-out switch Pressure-controlled wastegate Vacuum-operated bypass valve Pop-off valve
Vacuum-operated bypass valve
Which of the following should be checked before disassembling the cylinderhead? Rocker arm alignment Surface warpage OHC cam bore alignment Valve spring installed height
Valve spring installed height
A compression test was performed on a four cylinder engine with the following results: cylinder #1 = 138 psi, cylinder #2 = 127 psi, cylinder #3 = 115 psi, cylinder # 4 = 135 psi. Technician A says low compression in cylinders 2 and 3 indicates that the cylinder head gasket is leaking between these two cylinders. Technician B says the compression test is not conclusive enough to determine the problem. Uneven readings may be caused by burnt, sticking, or improperly adjusted valves or carbon deposits on the valve faces. Who is right? A only B only Both A and B Neither A nor B
B only
An engine has a hollow, metallic clatter when started cold. The noise diminishes and eventually goes away as the engine warms up to operating temperature. Technician A says the noise could result from low oil pressure caused by worn main bearings. Technician B says the noise could be piston slap caused by too much piston-to-cylinder wall clearance. Who is right? A only B only Both A and B Neither A nor B
B only
Technician A says the close wound end of a variable-pitch valve spring should be installed up, with the tight coils at the tip end of the valve. Technician B says the close wound end of a variable-pitch valve spring should be installed down, with the tight coils at the spring seat of the cylinder head. Who is right? A only B only Both A and B Neither A nor B
B only
While the engine is running, a technician pulls the PCV valve out of the valve cover and puts his thumb over the valve opening. There are no changes in engine operation. Technician A says the PCV valve could be stuck in the open position. Technician B says the hose between the intake manifold and the PCV valve could be plugged. Who is right? A only B only Both A and B Neither A nor B
B only
In a high mileage engine, cylinder wear is normally the greatest at the: Top of the cylinder measured parallel to the crankshaft Top of the cylinder measured at right angles to the crankshaft Bottom of the cylinder measured parallel to the crankshaft Bottom of the cylinder measured at right angles to the crankshaft
Top of the cylinder measured at right angles to the crankshaft
To correct specific gravity readings taken at a temperature of 90o F: Add 0.004 to the hydrometer reading Add 0.006 to the hydrometer reading Add 0.010 to the hydrometer reading Add 0.008 to the hydrometer reading
Add 0.004 to the hydrometer reading
Of the following types of sealant, which would be used when replacing a valve cover with a formed-in-place gasket? Aerobic Anaerobic High tack Metabolic
Aerobic
Of the following types of sealant, which would be used when replacing a valve cover with a formed-in-place gasket? High tack Anaerobic Metabolic Aerobic
Aerobic
Which of the following items must be removed in order to remove hydraulic lifters from an OHV engine? The pushrod The cylinder head The rocker arm The camshaft
The pushrod
When assembling the connecting rod onto a piston: The rod can be installed in one direction only The rod can be installed in either direction The piston notch is always to the rear of the engine The piston pin must be installed in the connecting rod first
The rod can be installed in one direction only
The rated temperature of a thermostat indicates: The temperature where it fully closes The thermostat bypass temperature The temperature where it is fully open The temperature where it begins to open
The temperature where it begins to open
