mechanical engineering MCQs – Page 60

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

1181. Split nut is a locking device in which_________________?
0

A. 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

B. none of the above

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

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

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

1182. Cap screws are___________________?
0

A. similar to stud

B. used to prevent relative motion be-tween parts

C. provided with detachable caps

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

E. similar tosmall size tap bolts except that a greater variety of shapes of heads are available

1183. The fuel in diesel engine is normally injected at pressure of_________________?
0

A. 150-250 kg/cm2

B. 60-80 kg/cm2

C. 90-130 kg/cm2

D. 5-10 kg/cm2

E. 20-25 kg/cm2

1184. A diesel engine has_________________?
0

A. 3 valves

B. 1 valve

C. 4 valves

D. 2 valves

E. no valve

1185. When a close coiled helical spring is compressed, its wire is subjected to________________?
0

A. compression

B. none of the above

C. shear

D. tension

E. all of the above

1186. For the same compression ratio_____________________?
0

A. Otto cycle is more efficient than the Diesel

B. Diesel cycle is more efficientthan Otto

C. both Otto and Diesel cycles are, equally efficient

D. compression ratio has nothing to do with efficiency

E. which is more efficient would depend on engine capacity

1187. A tap bolt_____________________?
0

A. has a head on one end and a nut fitted to the other

B. has head at one end and other end fits into a tapped hole in the other part o be joined

C. has both the ends threaded

D. has pointed threads

E. requires locking devices

1188. The fatigue limit of a material____________________?
0

A. remains same irrespective of surface conditions

B. is greatly decreased by poor surface conditions

C. is dependent upon yield strength of material

D. depends mainly on core composition

E. none of the above

1189. The draw of cotter need not exceed_________________?
0

A. 10 mm

B. 25 mm

C. 20 mm

D. 5 mm

E. 3 mm

1190. An optimum project schedule implies_______________?
0

A. optimum utilization of men, machines and materials

B. realistic execution time, minimum cost and maximum profits

C. timely execution of project

D. to produce best results under given constraints

E. lowest possible cost and shortest possible time for project

1191. In a typical medium speed 4-stroke cycle diesel engine________________?
0

A. none of the above

B. compression starts at bottom dead center and ends at top dead center

C. compression starts at 10 before bottom dead center and, ends just before top dead center

D. may start and end anywhere

E. compression starts at 35 after bottom dead center and ends at top dead center

1192. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be________________?
0

A. 8%

B. 27%.

C. 2%

D. 4%

E. 14%

1193. The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is___________________?
0

A. 0.01 micron

B. 0.1 micron

C. 1 micron

D. 10 microns

E. 25 microns

1194. In standard taper roller bearings, the angle of taper of outer raceway is___________________?
0

A. 8

B. 25

C. 5

D. 40.

E. 15

1195. The precess of breaking up or a lipuid into fine droplets by spraying is called___________________?
0

A. atomisation

B. vaporisation

C. carburetion

D. injection

E. ionisation

1196. In order to obtain bolt of uniform strength____________________?
0

A. all of the above

B. tighten die bolt properly

C. increase its length

D. drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread

E. increase shank diameter

1197. The magneto in an automobile is basically__________________?
0

A. transformer

B. a.c. generator

C. magnetic circuit

D. capacitor

E. d.c. generator

1198. The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?
0

A. more

B. less

C. same

D. unpredictable

E. less or more depending on operating conditions

1199. The piston rod of a steam engine is usually connected to the cross head by means of__________________?
0

A. universal joint

B. bolted joint

C. kunckle joint

D. universal coupling

E. cotter joint

1200. A self locking screw has________________>
0

A. hole for inserting split pin

B. fine threads

C. coefficient of friction > tangent of load angle

D. two nuts for locking

E. coarse threads

Previous Next

Showing 1181 to 1200 of 4266 mcqs