Real Time B Level Repair Technician Interview Questions and Answers PDF
• Technician A Says The Voltage Required Maintaining Spark Is Referred To As The Spark Line And The Duration Of The Spark Line Is Based On Total Primary Circuit Resistance And Coil Voltage Available. Technician B Says Problems With The Burning (called Fuel Propagation) Will Show Up Within The Spark Line. Who Is Right?
Technician B is correct because problems with the fuel/air burning (called fuel propagation) will show up within the spark line.
• A Technician Is Using A Laptop Computer And Manufacturer Software To Test The Ect (electronic Controlled Throttle) Circuit That Has A Stored Dtc P1121 (electric Throttle Control Actuator). Which Of The Following Customer Concerns Could Be Caused By A Defective Ect Return Spring Malfunction?
The ECM has a stored DTC P1121 (Electric Throttle Control Actuator). When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up. While the engine is in fail-safe mode and malfunction A of DTC P1121 is detected, the engine speed will not rise more than 2,000 RPM and thus cause a low power complaint. The ECM controls the electric throttle actuator by regulating the throttle opening around the idle position.
• Which Is Least Likely To Be Necessary When Refilling A Cooling System?
Distilled water is the least likely required in a cooling system because it has no effect on the cooling ability of the solution. Distilled water is not required in a cooling system. It is used with battery electrolyte.
• Technician A Says Old Antifreeze May Cause Corrosion Build-up In The Cooling System. Technician B Says Some Original Equipment Manufacturers (oem) Recommend That The Coolant Be Changed At Specified Intervals. Who Is Right?
Both technicians are correct. Antifreeze or engine coolant contains corrosion inhibitor that wears out over time, so this is the reason it is recommended that the coolant be replaced and the system flushed at a service interval. The freeze protection of the coolant never changes.
• An Engine Is Making A Knocking Sound That Changes With Rpm, And The Noise Disappears While A Cylinder Is Being Tested During The Cylinder Balance Test. Which Could Be The Cause?
A bad rod bearing will make a knocking sound with changes in RPM and disappear when the cylinder is shorted out.
• A Technician Hears A Knock Or Thumping At The Side Of The Engine Block That Is Louder When The Engine Is Hot And Goes Away When The Affected Cylinder Is Shorted Out. Which Could Be The Cause?
Rod bearing noise is a thumping noise or knock at the side of the engine block that is louder when the engine is hot and goes away when the affected cylinder is shorted out. A is wrong because main bearing noise is constant and cannot be shorted out. A main bearing noise is generally deeper sounding than a rod bearing. Also, a main bearing makes an evenly spaced single knock while a rod bearing generally makes a double knock. B is wrong. A wrist pin noise can be diagnosed by disconnecting spark plug wires one at a time. Should the noise in the engine immediately double in frequency, then it's a wrist pin. Should the noise merely diminish a bit, then probably a rod knock caused by a loose bearing. D is wrong because piston slap noise disappears once the engine is warm. Piston slap could be caused by the piston skirt deforming under stress.
• The Surface Of The Cylinder Head Has Just Been Machined. What Will Have To Be Done To The Valve Train?
Grinding the valve stems will have to be done because the distance has been reduced between the rocker and the pushrod, so you grind the valve stem to compensate.
• What Is Correct When Adjusting Valve Lash On Engines With Overhead Camshaft Cylinder Heads, Except:
You must check the specific OEM procedure for adjusting valves either hot or cold.
• Technician A Says The Closed Coil End Of A Valve Spring Should Go Against The Cylinder Head. Technician B Says All Valve Springs Use Shims To Control Free Spring Height. Who Is Right?
Technician A is a correct. A closed coil end of a valve spring should go against the cylinder head. Technician B is wrong because all valve springs do not use shims to control assembled height. It is also wrong because it should state assembled height.
• A Power Balance Test Is Being Performed On An Engine. Technician A Says To Note The Engine Rpm Before And During The Test For Each Cylinder. Technician B Says To Record The Rpm Drop For Each Cylinder. Who Is Right?
Both technicians are correct. Tech A is right because engine RPM (Revolutions Per Minute) is an indicator of when that cylinder is contributing to the engine power and if it is balanced. You note the RPM before and during the test so when the cylinder is shorted out you can tell if it changes. Tech B is right because when the engine speed (RPM) does not drop or change, then that cylinder is not having an effect on engine operation or balance.
• What Are Reasons Why You Must Disable The Fuel Injection System And Ignition System When Conducting An Engine Compression Test, Except:
The purpose for disconnecting the fuel injection and ignition systems is SAFETY related. Reading accuracy is very important but not what was asked.
• An Engine Noise Sounds Like A Knock At The Side Of The Engine That Is Louder When The Engine Is Cold And Goes Away Or Is Reduced When The Engine Reaches Operating Temperature. Which Is The Most Likely Cause?
Piston slap is a knock heard at the side of the engine which is louder when the engine is cold and goes away or is reduced when the engine reaches operating temperature.
• Which Creates A Flapping Sound Near The Front Of The Engine?
A loose timing belt will cause a flapping sound near the front of the engine.
• What Is The Cause Compressor Drive Belt Edge Wear, Except?
The clutch air gap has no effect on belt wear.
• Why Should You Never Touch The Tip Of A Halogen Bulb?
Oil from your skin leaves a residue on the glass shell to the bulb. When the bulb is turned on, it begins to get hot. Much of this heat is dumped into air around the bulb and is carried away. However, when there is oil on the bulb, it begins to get heated as well. The heat is actually enough to cause oil to boil and its temperature can reach near 1,100 Fahrenheit. This "hot spot" puts a great deal of heat near the glass bulb and can cause glass in the hot spot to warp and stretch. This causes a weak spot in the glass bulb which can break and thus shortening life span. The other choices will not happen.
• The Starter Motor Was Recently Replaced And Now Makes A Whining Noise When Starting. Which Is The Most Likely Cause?
A whining noise is most likely caused by an incorrect clearance between the starter drive pinion and the flexplate or flywheel teeth. Shim (or half shim) may be needed to provide the proper clearance between the flywheel teeth of the engine and the pinion teeth of the starter.
• The Open Circuit Voltage (ocv) Test On A Fully Charged Battery Should Show Which Voltage?
The standard is 2.1 volts per cell and 2.1 times 6 is 12.6 volts.
• Why Are Drum Brakes Adjusted?
The lining does wear and increases the clearance between the drum and brake lining. A manual or automatic adjustment decreases this clearance.
• A Spongy Brake Pedal May Be Caused By?
Air causes a gap in the hydraulic fluid flow because the fluid has to compress the air before it can apply the piston. This delay causes the spongy feel. The other choices do not affect this concern.
• A Technician Is Rotating The Tires Using The Modified X-method Of Tire Rotation On A Front-wheel-drive Vehicle. Where Should Be The Right Front Wheel Placed?
This is the standard practice for a modified X tire rotation.
• Steering Dampers Can Be Used To Reduce Excessive __________?
High positive caster places the top of the wheel high, so when it lifts, if too high, it will cause wheel kickback.
• Close Visual Inspection Of The Power Steering Serpentine Belt Can Reveal All Except?
Proper belt tension,You cannot see proper belt tension.
• When Replacing A Cv (constant Velocity) Joint Or Boot, What Is The Last Step Before Clamping The Boot?
Before clamping the last seal on the boot, be sure to release trapped air to prevent the boot from expanding when heated and collapsing when cold (This is sometimes called burping the boot). Clamp the boot according to the manufacturer's specifications. The final step in the process is reinstalling the drive axle shaft in reverse order of removal and torque the drive axle nut to factory specifications.
• A Rwd (rear Wheel Drive) Transmission Has A Leaking Output Shaft Seal On A Vehicle With 25,000 Miles On The Odometer. The Most Likely Cause For The Leakage Is:
A plugged transmission breather filter causing excessive internal pressure is the most likely cause.
• Technician A Says The Auxiliary Automatic Transmission Oil Cooler Is A Small Radiator Separate From The Engine Radiator. Technician B Says That If The Automatic Transmission Oil Cooler Lines Are Found To Be Leaking, They Are First Tightened To Specifications. Who Is Right?
Both technicians are right. Technician A is correct because heavy duty applications will use an auxiliary automatic transmission oil cooler. Technician B is correct because the first step in a leaking fluid line fitting is to tighten it to specifications using a torque wrench. If there is still a leak, then the fitting is defective and needs repaired.
• A Vehicle With An Electronically Controlled Automatic Transmission Is Being Road Tested For Poor Shifting. What Should Be Done Before Doing A Road Test?
The automatic transmission fluid (ATF) must always be verified before a road test.
• Two Technicians Are Explaining Radiator Cap Service. Technician A Says A Radiator Cap Is Tested Using A Cooling System Pressure Tester. Technician B Says When The Radiator Cap Does Not Hold Enough Pressure, You Can Replace The Cap Gasket. Who Is Right?
Technician A is right because a defective radiator cap can cause low cooling system pressure; it allows cooling system pressure to escape. Technician B is wrong because the only acceptable repair for a defective radiator pressure cap is replacement.
• A Tight Timing Belt Makes What Type Of Noise?
When the cogs of the belt hit the cogs in the sprocket it is similar to the noise two gears make.
• Mention The Injector Pressure In Heavy Vehicle?
Injector pressure in heavy vehicle is about 220 kg/cm square.
• Explain Clutch System Works?
Clutch system is made up of two metal plates adjacent to the engine. When you press the clutch pedal down the plates come apart separating the engine from the drive wheels allowing the drivers to change the gear, and re-engage the plates again with the engine once the gear is changed.
• How Petrol Engine Is Different Than Diesel Engine?
Petrol engine: Petrol engine works on the principle of Intake (fuel + air), Compression, Power and Exhaust. It means the fuel, and air will enter the combustion chamber, piston come upwards and compress the fuel. The compressed fuel comes in contact with spark plug and produces a spark that push piston down
Diesel Engine: In diesel engine the phenomenon is slightly different, there is no sparkplug in diesel engine. In here only air enters in the burning chamber, when piston is pushed up by motor, it will compress the air in the chamber, making it hot. Now valve opens and inject diesel, because of compressed air, the diesel blasts and push the piston down.
• What Do You Mean By Cc When Mentioning Car Efficiency?
CC stands for Cubic Centimetres; it tells the total volume of the engine cylinder. It indicates that the automobile with more CC produces more power than the other engines.
• What Are The Important Components Of Engine Lubrication System?
Important components of engine lubrication system includes
o Oil pan: It is a container where engine oil settles down when car is not running
o Pickup tube: When engine starts oil get sucked up through pickup tube
o Oil pump: The pump will help to slide up oil into the tube against the gravity
o Pressure relief valve: It relieves the pressure on oil
o Oil filter: It removes dirt and debris form the oil
o Spurt holes and galleries: These are the holes in the crankshaft or other parts of the engine through which oil streams and make them lubricated
o Sump: Once it has lubrication job is done it will go back again into oil pan or sump
• Explain What Are The Components In Alternator And How It Works?
An alternator consists of the stator, rotor and copper wiring. The rotor and stator are belt driven magnets encased in copper wiring, which creates a magnetic field. This belt is connected with engine, so when engine starts it rotates the rotor and generate a magnetic field. Stator converts this magnetic field into voltage that flows to the diode. The diode assembly converts the AC electricity to DC, which is used by car battery.
• What Is Automotive Charging System Is Made Up Of?
Automotive charging system is made up of
o Battery
o Voltage Regulator
o Alternator
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