II nd Semester Multiple Choice Questions for D/MECH
- A 4-stroke produces one power stroke in
(a) 2 revolutions of crankshaft (b) 4 revolutions of crankshaft
(c) 6 revolutions of crankshaft (d) 8 revolutions of crankshaft
Ans: a
2. A 2-stroke cycle engine produces one power stroke in
(a) each revolution of crankshaft (b) 2 revolutions of crankshaft
(c) 3 revolutions of crankshaft (d) 4revolutions of crankshaft
Ans: a
3. Which one of the following gives the correct position of inlet and exhaust valves during the powerstroke?
(a) inlet valve opens and exhaust valve closes (b) exhaust valve opens and inlet valve closes
(c) both valvesremain in closed position (d) both valves remain in open position
Ans: c
4. An engine has a clearance volume of 100 cm³ and a swept volume of 800 cm³. The compression
ratio is
(a) 10:1 (b) 9:1
(c) 8:1 (d) 7:1
Ans: b
5. Which one of the following engine components carries the engine over its non-working strokes?
(a) piston (b) crankshaft
(c) connecting rod (d) flywheel
Ans: d
6. A two-stroke engine has ports in the
(a) piston (b) cylinder walls
(c) piston rings (d) crankcase
Ans: b
7. During suction stroke the charge drawn in a petrol engine is
(a) petrol only (b) air only
(c) air and petrol mixture (d) none of the above
Ans: c
8. In a diesel engine, fuel and air mix together in the
(a) carburettor (b) injector
(c) combustion chamber (d) inlet port
Ans: c
9. The two firing orders used on four-cylinder in-line engines are
(a) 1 3 4 2 and 1 4 2 3 (b) 1 4 2 3 and 1 3 2 4
(c) 1 3 2 4 and 1 2 4 3 (d) 1 2 4 3 and 1 3 4 2
Ans: d
10. Which one of the following parts of diesel engine fuel tank is responsible for minimizing the
slushing of fuel due to movement inside the tank?
(a) Filler cap (b) filler neck
(c) drain plug (d) baffles
Ans: d
11.What is the meaning of CNG?
a) Compressed natural gas (b)Compressed Nitrogen gas
c)Carbon neutral gas (d)None of these
Ans:a
12.Which of the following is made of Aluminium alloy?
a) Piston Ring (b) Piston
c)Connecting rod (d)Crank shaft
