Automobile Engineering MCQ Questions

27-The force which retards the motion of one body, in contact with another body is called
(A) Friction
(B) Adhesion
(C) Cohesion
(D) Torsion
[expand title=”View Answer”](B) Adhesion[/expand]
 
28-If you notice the presence of engine oil inside the radiator filler neck, the reason can be:
(A) Defective radiator pressure cap
(B) Damaged cylinder head gasket
(C) Defective thermostat valve
(D) Defective oil pump
[expand title=”View Answer”](B) Damaged cylinder head gasket[/expand]
 
29-Which process gives the engine cylinder a crosshatch pattern?
(A) Drilling
(B) Boring
(C) Facing
(D) Honing
[expand title=”View Answer”](D) Honing[/expand]
 
30-In a diesel engine, the fuel gets ignited by:
(A) Fuel injector
(B) Electric spark
(C) Heater plug
(D) Heat of compressed air
[expand title=”View Answer”](D) Heat of compressed air[/expand]
 
31-When the piston is at BDC, the volume of the cylinder above the piston is:
(A) Clearance volume
(B) Swept volume
(C) Total volume
(D) Compression ratio
[expand title=”View Answer”](C) Total volume[/expand]
 
32-“Scuffing” occurs when:
(A) Piston slides against cylinder without lubrication
(B) Piston clearance is excessive
(C) Piston rings are worn out
(D) Cylinders liner is worn out
[expand title=”View Answer”](A) Piston slides against cylinder without lubrication[/expand]
 
33-Opening and closing of the valves in relation to the position of piston and flywheel are called:
(A) Valve lead
(B) Valve lag
(C) Valve overlap
(D) Valve timing
[expand title=”View Answer”](D) Valve timing[/expand]
 
34-The ratio of work output of an engine to the fuel energy burnt is called
(A) Mechanical efficiency
(B) Volumetric efficiency
(C) Thermal efficiency
(D) Overall efficiency
[expand title=”View Answer”](C) Thermal efficiency[/expand]
 
35-Snips are used for
(A) Cutting away a thick layer of metal
(B) Cutting sheet metal
(C) Cutting wooden blocks
(D) Cutting external threads
[expand title=”View Answer”](B) Cutting sheet metal[/expand]
 
36-A round rod which does not have ahead, and has external threads at both ends is called:
(A) Stud
(B) Bolt
(C) Nut
(D) Screw
[expand title=”View Answer”](A) Stud[/expand]
 
37-Which of the following is not a precision measuring instrument?
(A) Outside micrometer
(B) Dial indicator
(C) Vernier height gauge
(D) Universal surface gauge
[expand title=”View Answer”](D) Universal surface gauge[/expand]
 
38-The cross-sectional shape of an Allen key is:
(A) Square
(B) Pentagon
(C) Hexagon
(D) Octagon
[expand title=”View Answer”](C) Hexagon[/expand]
 
39-Which file has minimum space between their teeth?
(A) Rough files
(B) Smooth files
(C) Coarse files
(D) Bastard files
[expand title=”View Answer”](B) Smooth files[/expand]
 
40-Which of the following is used for securing a tightened nut in position?
(A) Key
(B) Cotter pin
(C) Snap ring
(D) Gasket
[expand title=”View Answer”](D) Gasket[/expand]