1251. The knock in diesel engine occurs due to____________________?
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A. delayed burning of the first part of the charge

B. instantaneous and rapid burning of the first part of the charge

C. reduction of delay period

D. all ot the above

E. instantaneous atuo iginition of last part of charge

1253. The main advantage of line organisation is its_______________?
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A. rigid discipline in the organisation

B. all of the above

C. effective command and control

D. defined responsibilities at all levels

E. ability of quick decision at all levels

1254. In loop scavenging, the top of the piston is________________?
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A. flat

B. contoured

C. depressed

D. convex shaped

E. slanted

1255. Crankcase explosion in I.C. engines usuall occurs as ___________________?
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A. first a mild explosion followed by a bi explosion

B. first a big explosion followed by a mil explosion

C. both mild and big explosions occi simultaneously

D. never occurs

E. unpredictable

1256. The designation M 33 x 2 of a bolt means___________________?
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A. metric threads of 33 mm outside diameter and 2 mm pitch

B. metric threads with cross-section of 33 mm

C. bolt of 33 mm nominal diameter having 2 threads per cm

D. none of the above

E. metric threads of 33 nos in 2 cm.

1257. In a typical medium speed 4 stroke cycle diesel engine_______________?
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A. may open and close anywhere

B. exhaust valve opens just after bottom dead center and closes just before top dead center

C. exhaust valve opens at 35 before bot-tom dead center and closes at 20 after top dead center

D. none of the above is true

E. exhaust valve opens at bottom dead center and closes at top dead center

1259. Taper on the cotter and slot is provided_________________?
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A. on both the sides

B. on one side only

C. on none of the sides

D. may be provided anywhere

E. none of the above

1260. Whether any core is required in wire ropes________________?
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A. very often

B. no

C. yes

D. rarely

E. sometimes

1262. Cold working________________?
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A. decreases the fatigue strength

B. alone has no influence on fatigue strength

C. increases the fatigue strength

D. has no influence on fatigue strength

E. none of the above

1263. Form coefficient of spring is _____________________?
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A. load required to produce unit deflection

B. ratio of coil diameter to wire diameter

C. nothing

D. concerned With strength of wire of spring

E. its capability of storing energy
1264. In case of gas turbines, the gaseous fuel consumption guarantees are based on________________?
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A. net calorific value

B. calorific value

C. high heat value

D. middle heat value

E. low heat value
1266. Which of the following is not an interns combustion engine___________________?
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A. steam turbine

B. 2-stroke petrol engine

C. diesel engine

D. 4-stroke petrol engine

E. gas turbine

1267. Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?
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A. none of the above

B. the friction is high

C. the small difference in cooling water temperature or in internal friction has a disproportionate effect

D. the friction is unpredictable

E. the engine is rarely operated

1268. If threads on a bolt are left hand, threads on nut will be_____________________?
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A. could be left or right hand

B. right hand with same pitch

C. left hand with same pitch

D. right hand with fine pitch

E. left hand with fine pitch

1270. The permissible stress for carbon steel under static loading is generally taken as__________________?
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A. 3000-4000 kg/cm2

B. 4000-4500 kg/cm2

C. 10,000-15,000 kg/cm2

D. 2000-3000 kg/pm2

E. 7500-10,000 kg/cm2

1271. Turn buckle has____________________?
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A. right hand threads on bout ends

B. left hand threads on both ends

C. left hand threads on one end and right hand threads on other end

D. no threads

E. threads in middle portion

1272. A 75 cc engine has following parameter as 75 cc ___________________?
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A. clearance volume

B. swept volume

C. fuel tank capacity

D. cylinder volume

E. lub oil capacity

1273. Silver-based solder is used for__________________?
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A. flaring

B. none of the above

C. brazing

D. fusion welding

E. soft soldering

1275. Set screws are_________________?
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A. used to prevent relative motion be-tween parts

B. slotted for a screw driver and generally used with a nut

C. similar to small size tap bolts except that a greater variety of shapes of heads are available

D. similar to stud

E. none of the above

1277. In diesel engine, the compression ratio in comparison to expansion ratio is_______________?
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A. more

B. less

C. variable

D. more/less depending on engine capacity.

E. same

1278. Inventory management consists of__________________?
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A. state of merchandise methods of stroing and maintenance etc

B. effective running of stores

C. all of the above

D. none of the above

E. stock control system

1279. An engine indicator is used to determine the following___________________?
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A. volume of cylinder

B. BHP

C. speed

D. m.e.p. and I.H.P.

E. temperature

1281. Castle nut is a locking device in which__________________?
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A. a slot is cut partly is middle of nut and then slot reduced by tightening a screw

B. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

C. through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

D. none of the above.

E. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

1282. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the________________?
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A. piston rings would stick into piston grooves

B. exhaust will be smoky

C. scavenging occurs

D. exhaust temperature will be high

E. engine starts overheating

1283. The reason for supercharging in any engine is to________________?
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A. increase power

B. effect fuel economy

C. none of the above

D. reduce weight and bulk for a given out-put

E. increase efficiency

1284. Work study is most useful_______________?
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A. where men are biggest contributor to success of a project

B. in improving industrial relations

C. in judging the rating of machines

D. in judging the output of a man and improving it

E. where production activities are involved
1285. All heat engines utilize_____________________?
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A. net claorific value of oil

B. low heat value of oil

C. high heat value of oil

D. calorific value of fuel

E. all of the above

1286. Rivets are generally specified by_______________?
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A. nominal diameter

B. length of rivet

C. all of the above

D. thickness of plates to be riveted

E. diameter of head

1287. Jam nut is a locking device in which _____________________?
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A. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

B. none of the above

C. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

D. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

E. a slot is cut partly in middle of nut and then slot reduced by tightening a screw

1288. The strap end of a connecting rod of steam engine is joined by_________________?
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A. universal coupling

B. sleeve and cotter joint

C. knuckle joint

D. spigot socket cotter joint

E. gib of cotter joint
1289. Engine pistons are usually made of aluminium alloy because it_________________?
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A. wears less

B. is stronger

C. does not react with fuel and lub oil

D. absorbs shocks

E. is lighter
1290. Compression ratio of LC. engines is ___________________?
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A. volume displaced by piston per stroke and clearance volume in cylinder

B. the ratio of volumes of air in cylinder before compression stroke and after compression stroke

C. ratio of pressure after compression and before compression

D. swept volume/cylinder volume

E. cylinder volume/swept volume

1291. The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is_________________?
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A. larger

B. equal

C. larger/smaller depending on diameter of spring coil

D. unpredictable

E. smaller

1292. Machine screws are________________?
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A. similar to small size tap bolts except that a greater variety of shapes of heads are available

B. slotted for a screw driver and generally used with a nut

C. similar to stud

D. used to prevent relative motion be-tween two parts

E. none of the above

1293. The resultant axial load on a bolt depends on_______________?
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A. external load applied

B. initial tension

C. relative elastic yielding (springness) of the bolt and the connected member

D. A, B. and C. above

E. A. and B. above

1294. Acceptance sampling is widely used in________________?
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A. mass production

B. all of the above

C. batch production

D. none of the above

E. job production

1295. Gear box is used___________________?
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A. to produce torque

B. to damp out vibrations

C. to increase efficiency of system

D. to obtain variable speeds

E. for speed reduction

1297. For applications involving high stresses in one direction only the following type of thread would be best suited______________________?
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A. square thread

B. British Association thread

C. buttress thread

D. acme thread

E. ISO metric thread

1298. Supercharging is the process of_____________________?
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A. providing forced cooling air

B. injecting excess fuel for raising more load

C. supplying compressed air to remove combustion products fully

D. raising exhaust pressure

E. supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
1299. Templates are used for_________________?
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A. a planning layout

B. advancing a programme in automatic machines

C. copying complicated profiles

D. flow of material

E. none of the above