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McqMate
301. |
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 |
Answer» D. Presence of nitrogen in the exhaust |
302. |
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 |
Answer» C. Bring the fuel quickly in contact with air |
303. |
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 |
Answer» B. exhaust port opens 5? before the transfer port and closes 5? after the transfer port |
304. |
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 |
Answer» B. Too lean |
305. |
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 |
Answer» D. Blow-by |
306. |
Which instrument is used to measure specific gravity |
A. | Thermometer |
B. | Hydrometer |
C. | Hydrometer |
D. | Anemometer |
E. | None of the above |
Answer» C. Hydrometer |
307. |
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 |
Answer» B. two lobed epitrochoid section |
308. |
The efficiency of an oil bath type air cleaner is usually |
A. | 90% |
B. | 50% |
C. | 60% |
D. | 99% |
E. | 80% |
Answer» D. 99% |
309. |
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 |
Answer» B. Propane and butane |
310. |
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 |
Answer» C. Lack of cylinder jacket cooling water |
311. |
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 |
Answer» B. value timing diagram |
312. |
Which is the Diesel engined vehicle |
A. | Ambassador Mark II |
B. | Premier padmini |
C. | Standard Gazel |
D. | Maruti |
E. | None of the above |
Answer» E. None of the above |
313. |
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 |
Answer» B. Clutch failure to disengage |
314. |
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 |
Answer» B. Carbon chrome steel |
315. |
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 |
Answer» D. less than 1 mm |
316. |
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 |
Answer» C. Feeler gauge |
317. |
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 |
Answer» C. avoids arcing at contact breaker |
318. |
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 |
Answer» E. Any of the above |
319. |
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 |
Answer» B. 2.7 volts |
320. |
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 |
Answer» A. About 10% surplus |
321. |
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 |
Answer» A. detonation |
322. |
Bead wires are made of |
A. | steel |
B. | copper |
C. | zinc |
D. | Aluminium |
E. | None of the above |
Answer» A. steel |
323. |
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 |
Answer» D. About 90 percent |
324. |
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 |
Answer» B. Operating cost |
325. |
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 |
Answer» C. incorporating an auxiliary chamber |
326. |
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 |
Answer» C. low density |
327. |
The number of plies in a truck tyre is usually |
A. | 2 |
B. | 5--8 |
C. | 8--10 |
D. | 3 |
E. | 12--16 |
Answer» E. 12--16 |
328. |
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 |
Answer» B. 500 |
329. |
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 |
Answer» D. Clutch |
330. |
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 |
Answer» E. Controlling the temperature of the cooling system |
331. |
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 |
Answer» A. metal foundations of the tyre |
332. |
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 |
Answer» E. Any of the above |
333. |
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 |
Answer» A. Lessen the danger of skidding |
334. |
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 |
Answer» D. valve overlap is the angle during which both the inlet and exhaust valves remain open simultaneously |
335. |
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 |
Answer» B. Small particles |
336. |
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 |
Answer» C. A defective spark plug |
337. |
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 |
Answer» C. Smoky black exhaust |
338. |
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 |
Answer» A. 0.5 to 1% |
339. |
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 |
Answer» A. increases |
340. |
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 |
Answer» A. Piston pin |
341. |
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 |
Answer» A. During acceleration |
342. |
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 |
Answer» B. Pump the fuel from the tank into the injection pump |
343. |
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 |
Answer» C. auxillary brakes which supplement the main brake |
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