Quiznetik
Automobile Engineering | Set 4
1. Which of the following symptoms will not show that the combustion is necessarily complete or not?
A. Presence of free carbon in exhaust
B. Presence of carbon monoxide in the exhaust
C. Presence of oxygen is the exhaust
D. Presence of nitrogen in the exhaust
E. None of the above
Correct : D. Presence of nitrogen in the exhaust
2. The turbulence in diesel engine ensures to
A. Increase the compression pressure
B. Reduce the engine vibrations
C. Bring the fuel quickly in contact with air
D. Increase the fuel consumption
E. Increase the volumetric efficiency
Correct : C. Bring the fuel quickly in contact with air
3. In a 2-stroke S.I. engine
A. exhaust and transfer (inlet) ports open and cloe simultaneously
B. exhaust port opens 5? before the transfer port and closes 5? after the transfer port
C. exhaust port opens 5? ahead of the transfer port but both ports close simultaneously
D. none of the above
E. None of the above
Correct : B. exhaust port opens 5? before the transfer port and closes 5? after the transfer port
4. In a S.I. engine, if the colour of exhaust flame is bluish, transparent, it indicates that the mixture supplied to the engine is
A. Suitable for maximum output
B. Too lean
C. Too rich
D. Chemical correct
E. Most economical
Correct : B. Too lean
5. The escape of burned gases from the combustion chamber past the pistons and into the crank case is called
A. Gas-loss
B. Crank case explosion
C. By-pass
D. Blow-by
E. Passed gas
Correct : D. Blow-by
6. Which instrument is used to measure specific gravity
A. Thermometer
B. Hydrometer
C. Hydrometer
D. Anemometer
E. None of the above
Correct : C. Hydrometer
7. The stationary part of the Wankel engine has an inner contour of
A. elliptical section
B. two lobed epitrochoid section
C. four lobed epitrochoid section
D. none of the above
E. None of the above
Correct : B. two lobed epitrochoid section
8. The efficiency of an oil bath type air cleaner is usually
A. 90%
B. 50%
C. 60%
D. 99%
E. 80%
Correct : D. 99%
9. LPG mainly consists of
A. Methane and ethane
B. Propane and butane
C. Petrol and diesel
D. Hexane and butadiene
E. None of the above
Correct : B. Propane and butane
10. Over heating of a two stroke air cooled engine cannot be due to
A. Incorrect ignition or valve timing
B. Too lean fuel mixture
C. Lack of cylinder jacket cooling water
D. Partly restricted exhaust system
E. Restricted air cleaner
Correct : C. Lack of cylinder jacket cooling water
11. The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as
A. indicator diagram
B. value timing diagram
C. axial force diagram
D. None of the above
E. None of the above
Correct : B. value timing diagram
12. Which is the Diesel engined vehicle
A. Ambassador Mark II
B. Premier padmini
C. Standard Gazel
D. Maruti
E. None of the above
Correct : E. None of the above
13. Executive clutch clearance caused by improper adjustment or wear of sliding sleeve, generally results in
A. Clutch slip
B. Clutch failure to disengage
C. Clutch plate over heating
D. Uneven clutch engagement
E. Any of the above
Correct : B. Clutch failure to disengage
14. Balls for a ball bearing are made of
A. Stainless steel
B. Carbon chrome steel
C. High speed steel
D. Mild steel
E. Stainless steel
Correct : B. Carbon chrome steel
15. In spark plug the gap between the electrodes is
A. 10 mm
B. around 5 mm
C. around 1 mm
D. less than 1 mm
E. None of the above
Correct : D. less than 1 mm
16. The device used to measure the clearance between the valve and tappet of an internal combustion engine is
A. Slip gauge
B. Thickness gauge
C. Feeler gauge
D. Snap gauge
E. Micrometer
Correct : C. Feeler gauge
17. The condenser in ignition circuit of an S.I. engine
A. increases the battery voltage
B. decreases the current from battery
C. avoids arcing at contact breaker
D. none of the above
E. None of the above
Correct : C. avoids arcing at contact breaker
18. In an automobile the probable cause for dragging brakes could be
A. Lack of clearance
B. Drums out of round
C. Loose wheel bearings
D. Weak retracting spring
E. Any of the above
Correct : E. Any of the above
19. When fully charged, the terminal voltage per cell for a battery is
A. 1.5 volts
B. 2.7 volts
C. 1.7 volts
D. 6 volts
E. 12 volts
Correct : B. 2.7 volts
20. For the best utilization of fuel, in the engine cylinder, the air supply should be
A. About 10% surplus
B. 15 to 20 percent deficient
C. About 25% surplus
D. 5 to 10 percent deficient
E. Chemically correct
Correct : A. About 10% surplus
21. The phenomenon that causes pressure waves resulting in vibration of structure, rough running and melting of piston is
A. detonation
B. pre-ignition
C. knocking
D. none of the above
E. None of the above
Correct : A. detonation
22. Bead wires are made of
A. steel
B. copper
C. zinc
D. Aluminium
E. None of the above
Correct : A. steel
23. The efficiency of hydraulic braking system is
A. 50 - 60 percent
B. 40 - 50 percent
C. 25 - 40 percent
D. About 90 percent
E. 60 - 70 percent
Correct : D. About 90 percent
24. Diesel engines are generally preferred for road transport these days because of low
A. Maintenance cost
B. Operating cost
C. Initial cost
D. Prime cost
E. Manufacturing cost
Correct : B. Operating cost
25. Stratification of charge is achieved by
A. use of two or more carburettors
B. locating two spark plugs on a cylinder
C. incorporating an auxiliary chamber
D. combining inlet and exhaust valves into a single unit
E. None of the above
Correct : C. incorporating an auxiliary chamber
26. The knocking in S.I. engines can be prevented if the end mixture is having
A. high density
B. medium density
C. low density
D. none of the above
E. None of the above
Correct : C. low density
27. The number of plies in a truck tyre is usually
A. 2
B. 5--8
C. 8--10
D. 3
E. 12--16
Correct : E. 12--16
28. A four sylinder four stroke petrol engine running at 1000 rpm will have in all how many sparks in one minute?
A. 250
B. 500
C. 1000
D. 2000
E. None of the above
Correct : B. 500
29. Which one of the following is mounted between the engine and gear box?
A. Propellor shaft
B. Differential gear
C. Reduction gear
D. Clutch
E. None of the above
Correct : D. Clutch
30. A thermostat is provided in automobile engines for
A. Controlling the temperature of the piston
B. Regulating the temperature of lubricating oil
C. Regulating the temperature of suction air
D. Regulating the temperature of haust gases.
E. Controlling the temperature of the cooling system
Correct : E. Controlling the temperature of the cooling system
31. Bead of a tyre constitutes
A. metal foundations of the tyre
B. side walls of the tyre
C. shoulder region
D. none of the above
E. None of the above
Correct : A. metal foundations of the tyre
32. The probable cause for uneven wear of tyres for a truck could be
A. Low tyre pressure
B. Excessive camber
C. Tyres overloaded
D. Incorrect castor
E. Any of the above
Correct : E. Any of the above
33. Circumferential grooves on tyres
A. Lessen the danger of skidding
B. Increase load carrying capacity
C. Provide good traction
D. Remove any stones etc. from sticking to the tyre
E. All of the above
Correct : A. Lessen the danger of skidding
34. Which one of the following is a correct statement
A. the exhaust valve of a four stoke I.C. engine should open exactly at the end of expansion stroke
B. in actual practice, inlet valve of a four stroke I.C. engine should open exactly at the start of suction stroke
C. the inlet valve remains open approximately for 180?
D. valve overlap is the angle during which both the inlet and exhaust valves remain open simultaneously
E. None of the above
Correct : D. valve overlap is the angle during which both the inlet and exhaust valves remain open simultaneously
35. A heat-treated glass generally used in automobiles upon cracking bursts into
A. Sharp edged fragments
B. Small particles
C. Does not disintegrate
D. Either of the above
E. None of the above
Correct : B. Small particles
36. In a multi-cylinder engine, missing in one cylinder is likely to result from
A. Clogged exhaust
B. Vapour lock
C. A defective spark plug
D. An overheated engine
E. None of the above
Correct : C. A defective spark plug
37. Dirt or gum in fuel nozzle or jets may cause
A. Excessive fuel consumption
B. Uneven engine speed
C. Smoky black exhaust
D. Lack of engine power
E. White exhaust
Correct : C. Smoky black exhaust
38. When not in use, the self-discharge of an automobile battery in dry weather is usually
A. 0.5 to 1%
B. 7 to 7.5%
C. Not more than 10%
D. Not more than 15%
E. Any of the above
Correct : A. 0.5 to 1%
39. If the cut-off is decreased, the efficiency of Diesel cycle
A. increases
B. decreases
C. is same
D. none of the above
E. None of the above
Correct : A. increases
40. Connecting rod is attached to the piston by the
A. Piston pin
B. Rod cap
C. Cap bolt
D. Lower cap
E. Cap roller bearing
Correct : A. Piston pin
41. Clutch slippage while clutch is engaged is particularly noticeable
A. During acceleration
B. At low speed
C. While starting the engine
D. During idling
E. During braking
Correct : A. During acceleration
42. The function of Diesel feed pump (when ever provided) is to
A. Pump the fuel to the injector
B. Pump the fuel from the tank into the injection pump
C. Send back the fuel from the injector into the tank
D. Pump the oil into the main gallery
E. Pump the fuel from the injection pump to the injector
Correct : B. Pump the fuel from the tank into the injection pump
43. In automobile braking system retarders are
A. chemicals which limit the rate of pressure rise in engine
B. chassis components which face wind resistance
C. auxillary brakes which supplement the main brake
D. none of the above
E. None of the above
Correct : C. auxillary brakes which supplement the main brake