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100+ Free RBSE SS Voc Automotive Practice Questions
Rajasthan RBSE Senior Secondary (Class 12) Vocational Automotive — Code 101 practice questions are available now; exam metadata is being verified.
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2026 Statistics
Key Facts: RBSE SS Voc Automotive Exam
101
RBSE subject code for Automotive
RBSE 2026 subject-wise statistics
100
Typical full marks for the subject scheme
RBSE syllabus examination scheme
3.15 hrs
Typical theory paper duration
RBSE Class 12 / Varishtha Upadhyaya syllabus scheme
33%
Typical minimum pass marks (confirm circular)
RBSE examination regulations
100
Free English MCQ study questions on this page
OpenExamPrep practice bank
RBSE Senior Secondary (Class 12) Vocational Automotive (code 101) is a real Board of Secondary Education, Rajasthan public-examination subject with appeared candidates in the 2026 main examination subject-wise statistics. Typical scheme: Theory 80 + Sessional 20 = 100; passing generally 33% (and separate practical pass where applicable). Use these free MCQs for theory revision only.
Sample RBSE SS Voc Automotive Practice Questions
Try these sample questions to test your RBSE SS Voc Automotive exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1In a four-stroke diesel engine, combustion is initiated primarily by:
A.Compression of air to a high temperature that ignites injected fuel
B.A spark plug firing at the end of the compression stroke
C.An external glow coil that remains on during every power stroke
D.A carburetor that premixes fuel and air before compression
Explanation: Diesel (CI) engines compress only air to high temperature and pressure; fuel is injected near TDC and auto-ignites. Spark plugs and carburetors belong to spark-ignition designs.
2The main function of the piston rings in a reciprocating engine is to:
A.Connect the piston to the timing belt permanently
B.Seal combustion gases, control oil, and transfer heat to the cylinder wall
C.Open and close the intake and exhaust valves
D.Meter fuel into the combustion chamber
Explanation: Compression and oil-control rings seal the combustion chamber, scrape excess oil, and help conduct heat from the piston crown to the cylinder wall/coolant path.
3Which statement correctly describes the relationship between bore, stroke, and engine displacement for a multi-cylinder engine?
A.Displacement equals bore diameter alone, independent of stroke and cylinder count
B.Displacement equals stroke length multiplied only by the compression ratio
C.Displacement is approximately (π/4) × bore² × stroke × number of cylinders
D.Displacement is fixed by the number of valves per cylinder only
Explanation: Swept volume per cylinder is cylinder cross-sectional area times stroke; total displacement multiplies by the number of cylinders. Valve count and CR do not define swept volume.
4A high compression ratio in a spark-ignition petrol engine generally:
A.Always requires diesel fuel and glow plugs
B.Eliminates the need for an exhaust system
C.Reduces thermal efficiency because peak pressure falls
D.Improves thermal efficiency but increases knock risk if fuel octane is too low
Explanation: Higher CR improves thermodynamic efficiency but elevates end-gas temperature/pressure, promoting knock unless adequate octane fuel and control strategies are used.
5During the exhaust stroke of a four-stroke engine, which valves are typically open?
A.Only the exhaust valve
B.Only the intake valve
C.Both intake and exhaust valves fully closed for the entire stroke
D.Only a separate third scavenging valve used on all passenger cars
Explanation: On the exhaust stroke the exhaust valve opens so burned gases leave; the intake valve is closed except for brief overlap near TDC in many designs.
6Valve overlap is the period when:
A.Both valves remain closed for the entire power stroke only
B.Both intake and exhaust valves are open near TDC between exhaust and intake strokes
C.The throttle plate is fully closed and fuel is cut completely
D.The starter engages and the alternator freewheels
Explanation: Overlap is a designed cam timing interval near TDC where exhaust residual can leave while intake charge begins to enter, aiding scavenging and volumetric efficiency (within emissions/idle constraints).
7The connecting rod primarily transmits force between:
A.The camshaft and the rocker arm
B.The flywheel and the clutch disc only
C.The piston and the crankshaft
D.The oil pump and the main bearings exclusively
Explanation: The connecting rod links the reciprocating piston to the rotating crankshaft, converting linear piston motion into crank rotation.
8In a DOHC (double overhead camshaft) petrol engine, each bank typically uses:
A.A single cam in the block operating both intake and exhaust valves via pushrods only
B.No camshafts because valves are solenoid-only in all DOHC designs
C.A camshaft mounted on the crank pulley exclusively
D.Separate camshafts in the cylinder head for intake and exhaust valve trains
Explanation: DOHC places two camshafts in the head—commonly one for intake valves and one for exhaust—enabling freer porting and often VVT on each shaft.
9Engine knocking (detonation) in an SI engine is best described as:
A.Abnormal auto-ignition of end-gas creating pressure waves after the spark-initiated flame
B.Normal smooth flame-front combustion at the designed spark timing
C.Complete failure of the fuel pump with no mixture present
D.A cooling-system fan that never turns on
Explanation: Knock is uncontrolled auto-ignition of unburned end-gas, producing sharp pressure oscillations that can damage pistons and bearings if severe.
10Mean effective pressure (IMEP/BMEP concepts at senior-secondary level) is most useful because it:
A.Replaces the need for any torque or power measurement forever
B.Allows comparison of engine work output independent of displacement differences
C.Is identical to coolant temperature in °C
D.Measures only oil pressure at idle in bar
Explanation: Mean effective pressure normalizes indicated or brake work to displaced volume, enabling fair comparison of engines of different sizes and as a loading indicator.
About the RBSE SS Voc Automotive Practice Questions
Verified exam format metadata for Rajasthan RBSE Senior Secondary (Class 12) Vocational Automotive — Code 101 is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.