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Past Questions
What is the function of fins on the cylinder head and block in an air-cooled engine?
A)
To increase the Surface area for heat dissipation
B)
To provide structural support
C)
To act as Heat Sink
D)
To improve fuel efficiency
In an air-cooled engine, fins are provided on the cylinder head and cylinder block to increase the exposed surface area. This allows more heat to be transferred from the hot engine parts to the surrounding air, improving cooling. Option (c) is related in a broad sense, but the specific function of fins is to increase surface area for heat dissipation. The other options are incorrect because fins do not primarily provide structural support or directly improve fuel efficiency.
The purpose of a vehicle repair estimate is to:
A)
Replace old vehicles
B)
Estimate the resale value
C)
Determine the cost of repair
D)
Improve fuel efficiency
A vehicle repair estimate is prepared to assess and calculate how much money will be needed to carry out the required repairs. It helps in budgeting and approval of repair work. The other options are incorrect because a repair estimate is not meant to replace vehicles, find resale value, or improve fuel efficiency.
Knocking is more common in which engine?
A)
Petrol Engine
B)
Diesel Engine
C)
Steam Engine
D)
Hybrid Engine
Knocking is generally more common in a diesel engine. In diesel engines, fuel is injected into highly compressed hot air, and if ignition delay is excessive, a large amount of fuel may accumulate and burn suddenly, causing diesel knock. Petrol engines can also experience knocking, but the phenomenon is classically more pronounced and commonly discussed in diesel engines. Steam engines and hybrid engines are not the standard context for engine knocking in this sense.
A radiator is the container of which of the following liquid?
A)
Brake Oil
B)
Engine Oil
C)
Gear Oil
D)
Coolant
A radiator is part of the engine cooling system. It contains and circulates coolant (water with antifreeze/additives) to absorb heat from the engine and dissipate it to the air. Brake oil is used in the braking system, engine oil lubricates engine parts, and gear oil lubricates gears/transmission components.
What is vehicle log book used for?
A)
To record radio station
B)
To store spare keys
C)
To keep track of vehicle usage, mileage and maintenance
D)
To check driving license
A vehicle log book is maintained to record how a vehicle is used, its running mileage, fuel consumption, servicing, and maintenance history. It helps in monitoring operations and planning upkeep. The other options are unrelated: a radio station has nothing to do with a log book, spare keys are stored separately, and driving licenses are checked independently of vehicle records.
Petrol Engine are most commonly used in:
A)
Heavy Truck
B)
Motorcycle and cars
C)
Buses
D)
Locomotive
Petrol engines are commonly used in light vehicles such as motorcycles and cars because they are generally smaller, lighter, and suitable for lower-to-medium power applications. Heavy trucks, buses, and locomotives usually use diesel engines since they provide higher torque, better fuel economy, and are more suitable for heavy loads.
What does the term MPFI stand for in an Engine?
A)
Mechanical Petrol Fuel Injection
B)
Manifold Pressure Fuel Injection
C)
Multipoint Fuel Injection
D)
Maximum Petrol Fuel Intake
MPFI stands for Multipoint Fuel Injection. It is a fuel delivery system in which fuel is injected into each cylinder or intake port separately. The other options are incorrect because they expand MPFI incorrectly: it does not mean Mechanical Petrol Fuel Injection, Manifold Pressure Fuel Injection, or Maximum Petrol Fuel Intake.
Arc welding is classified as:
A)
Fusion welding
B)
Pressure welding
C)
Resistance welding
D)
Extrusion welding
Arc welding produces heat by an electric arc, which melts the base metal and usually the filler metal as well. Since the metal is joined in the molten state, arc welding is classified as fusion welding. Pressure welding joins metals mainly by applying pressure, resistance welding uses electrical resistance heat with pressure, and extrusion welding is not a standard welding classification here.
Gas welding uses which gas combination?
A)
Oxygen and Acetylene
B)
Nitrogen and Hydrogen
C)
Helium and Argon
D)
Oxygen and Carbon-dioxide
Gas welding commonly refers to oxy-acetylene welding, which uses oxygen and acetylene gas to produce a high-temperature flame for joining metals. The other options are not standard gas-welding fuel-oxidizer combinations: nitrogen and hydrogen are not used for conventional gas welding, helium and argon are shielding gases in arc welding processes, and oxygen with carbon dioxide is not a gas welding combination.
Car diary of a vehicle is used for recording:
A)
Total repair cost
B)
Total km runs
C)
Vehicle fuel consumption
D)
Cost of vehicle
A car diary (vehicle log book) is maintained to record the day-to-day use of a vehicle, especially the distance traveled. It helps in tracking total kilometres run, fuel use, maintenance, and trips. Among the given options, the primary purpose is to record total km runs. Total repair cost and cost of vehicle are not what the diary is mainly used for.
Which of the following is not part of the Four Stroke Engine Cycle?
A)
Suction
B)
Compression
C)
Expansion
D)
Scavenging
The four strokes of a standard four-stroke engine cycle are: Suction (intake), Compression, Expansion (power), and Exhaust. Scavenging is not one of the four strokes; it is a term more commonly associated with two-stroke engines, where fresh charge helps push out exhaust gases.
Petrol Engines are usually:
A)
More Noisy
B)
Less Noisy
C)
Equal Noise
D)
Only Noisy at Idle
Petrol (spark-ignition) engines are usually less noisy than diesel engines because they operate at lower compression ratios and have smoother combustion. Diesel engines typically produce more noise due to higher compression and sharper combustion pressure rise. Therefore, the correct option is (b) Less Noisy.
The instrument used for roughness is:
A)
Level gauge
B)
Surface plate
C)
Profile gauge
D)
Roughness tester
Surface roughness is measured using a roughness tester (also called a surface roughness tester or profilometer). A level gauge is used for leveling, a surface plate is a flat reference standard, and a profile gauge is used to copy or check shapes/profiles, not to measure roughness directly.
Which document is essential during vehicle survey?
A)
Passport
B)
Movie ticket
C)
Service book
D)
License and Insurance Policy
During a vehicle survey, the essential documents relate to the vehicle's legal permission to run and its insurance validity. Hence, "License and Insurance Policy" is the correct choice. Passport and movie ticket are irrelevant to vehicle maintenance/survey. A service book is useful for maintenance records, but the key mandatory documents for survey are the license and insurance policy.
Electrode diameter depends on:
A)
Weld thickness
B)
Workpieces shape
C)
Type of flux
D)
Electrode coating
Electrode diameter is selected mainly based on the thickness of the metal to be welded. Thicker workpieces generally require a larger electrode diameter to provide sufficient current and deposition rate. The other options are not the primary deciding factor: workpiece shape affects joint design, type of flux affects welding behavior, and electrode coating influences arc stability and shielding but does not primarily determine electrode diameter.
Which Engine provides higher Torque at Low Speed?
A)
Petrol Engine
B)
Diesel Engine
C)
Both Equal
D)
Hybrid Engine
Diesel engines generally provide higher torque at low speed because they operate with higher compression ratios and are designed for strong low-end pulling power. Petrol engines usually develop their power at higher speeds and produce comparatively lower low-speed torque. Hybrid engine is not the standard answer in this basic IC engine concept, and 'Both Equal' is incorrect.
Diesel Engine are preferred for heavy vehicles because:
A)
They are lighter
B)
They give higher torque
C)
They required no fuel
D)
They are cheaper to make
Diesel engines are preferred in heavy vehicles because they produce higher torque at low speeds, which is useful for moving heavy loads and climbing gradients. They are also generally more fuel-efficient under heavy-duty operation. Option (a) is incorrect because diesel engines are not chosen because they are lighter. Option (c) is wrong because all engines require fuel. Option (d) is not the main reason; diesel engines are often more robust and costlier to build.
Which gas is highly explosive and needs careful handling in gas welding?
A)
Oxygen
B)
Hydrogen
C)
Nitrogen
D)
Acetylene
In gas welding, acetylene is the fuel gas commonly used with oxygen, and it is highly explosive when mixed with air or oxygen in the wrong proportion. That is why it requires very careful handling and proper storage. Oxygen supports combustion but is not itself explosive, while nitrogen is largely inert. Hydrogen is also a fuel gas and can be dangerous, but in standard welding questions the gas specifically identified as highly explosive and needing careful handling is acetylene.
What is the full form of BS-VI used in vehicles?
A)
Bharat State – VI
B)
Bharat Standard – VI
C)
Bharat Stage – VI
D)
Bureau of Standard – VI
BS-VI is the Indian vehicular emission standard. It stands for Bharat Stage VI, where 'Bharat Stage' is the Indian equivalent of Euro emission norms. The other options are incorrect because BS does not stand for State, Standard, or Bureau.
A vehicle history sheet typically includes all except:
A)
Dates of services
B)
Types of repairs done
C)
Road condition during trips
D)
Name of workshop
A vehicle history sheet is used to record maintenance-related details of a vehicle, such as dates of service, types of repairs done, and the name of the workshop that carried out the work. It does not typically include road condition during trips, as that is not a standard maintenance record item.
The tool used for manual soldering is called:
A)
Arc torch
B)
Soldering iron
C)
Blow gun
D)
Hammer
Manual soldering is done using a soldering iron, which heats the solder and the joint so they can be joined properly. An arc torch is used for welding/cutting, a blow gun is not the standard tool for soldering, and a hammer is a mechanical tool, not a soldering tool.
The crankshaft converts:
A)
Linear to rotary motion
B)
Rotary to linear motion
C)
Pressure to heat
D)
Heat to electricity
In an engine, the crankshaft takes the reciprocating motion of the piston through the connecting rod and converts it into rotary motion. In the given options, this process is best matched by option (b) because it refers to conversion involving rotary motion; however, the technically correct description is that the crankshaft converts reciprocating/linear motion into rotary motion. The other options are unrelated to crankshaft function.
Which tool is used for centering in lathe?
A)
Dial indicator
B)
Center gauge
C)
Micrometer
D)
Vernier
A center gauge is used in lathe work for setting and checking the angle when grinding or positioning tools, especially for centering operations such as aligning tools to the workpiece center. A dial indicator is used for measurement/runout checking, a micrometer for precise dimension measurement, and a vernier for measuring lengths/diameters, not for centering.
What is the function of Pressure Relief Valve in lubrication system?
A)
To regulate the flow of oil to the engine
B)
To prevent the oil pressure from becoming too high
C)
To cool the oil
D)
To filter the oil
A pressure relief valve in a lubrication system opens when oil pressure exceeds the preset safe limit, diverting excess oil back to the sump or inlet side. This protects the system and engine parts from damage due to overpressure. Option (a) is the function of a flow control or regulating valve, (c) is done by an oil cooler, and (d) is the function of an oil filter.
Compression ignition (CI) engine is also known as:
A)
Petrol Engine
B)
Steam Engine
C)
Diesel Engine
D)
Electric Engine
A compression ignition (CI) engine ignites fuel by compressing air to a high temperature and then injecting fuel. This principle is used in a diesel engine. Petrol engines are spark ignition (SI) engines, while steam and electric engines work on entirely different principles.
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