mechanical engineering MCQs – Page 55

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 Review each marked answer and report any item that may be outdated or unclear.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

1081. Air fuel ratio for idling speed of a petrol engine is approximately_________________?
0

A. 1:01

B. 20:01

C. 5:01

D. 15:01

E. 10:1

1082. For steel, the ultimate strength in shear as compared to ultimate strength in tension is ___________________?
0

A. 2-Jan

B. 3-Jan

C. 4-Jan

D. 2/3

E. same

1083. Elastic nut is a locking device in which__________________?
0

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

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

C. none of the above

D. 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 other end

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

1084. Which is more viscous lub oil_________________?
0

A. SEA 30

B. SAE 4

C. SAE 80

D. SAE 70

E. SAE 50

1085. Buttress threads are usually found on____________________?
0

A. railway carriage couplings

B. screw cutting lathes

C. feed mechanisms

D. spindles of bench vices

E. screw jack

1086. Time study is__________________?
0

A. the appraisal, in terms of time, of the value of work involving human effort

B. machine setting time

C. method of fixing time for workers

D. method of determining the personnel Requirement

E. time taken by workers to do a job

1087. Job enrichment technique is applied to_________________?
0

A. none of the above

B. all of the above

C. reduce labour monotony

D. overcome boring and demotivating work

E. make people happy

1088. Installation of supercharger on a four-cycle diesel engine can result in the following percentage increase in power_____________?
0

A. upto 25%

B. upto 35%

C. upto 75%

D. upto 50%

E. upto 100%.

1089. As a result of detonation in an I.C. engine, following parameter attains very high value _____________________?
0

A. rate of rise of pressure

B. rate of rise of horse-power

C. rate of rise of temperature

D. peak pressure

E. peak temperature

1090. A stoichiometric air-fuel ratio is______________________?
0

A. rich mixture for idling

B. chemically correct mixture

C. rich mixture for over loads

D. the ratio used at full rated parameters

E. lean mixture

1091. It the temperature of intake air in IC engines is lowered, then its efficiency will_______________________?
0

A. remain same

B. decrease

C. increase

D. increase upto certain limit and then decrease

E. decrease upto certain limit and then in-crease

1092. The process layout is best suited where______________?
0

A. bought out items are more

B. machines are arranged according to sequence of operation

C. few number of non-standardised units are to be produced

D. specialisation exists

E. mass production is envisaged

1093. In a naturally aspirated diesel engine, the air is supplied by________________?
0

A. a supercharger

B. an injection tube

C. forced chamber

D. a centrifugal blower

E. a vacuum chamber

1094. Standard time is defined as ____________________?
0

A. normal time + idle time

B. only normal time for an operation

C. none of the above

D. normal time + allowances

E. normal time + idle time + allowances

1095. The accunmulation of carbon in a cylinder results in increase of________________?
0

A. effective compression ratio

B. clearance volume

C. ignition time

D. volumetric efficiency

E. valve travel time.

1096. A key made from a cylindrical disc having segmental cross-section, is known as______________?
0

A. gib head key

B. wood-ruff key

C. hollow saddle key

D. flat saddle key

E. feather key

1097. Which of the following medium is compressed in a Diesel engine cylinder __________________?
0

A. air and fuel

B. air and lub oil

C. fuel alone

D. air, fuel and lub oil

E. air aione

1098. The specific fuel consumption per BHP hour for diesel engine is approximately___________________?
0

A. 0.3 kg

B. 0.15 kg

C. 0.2 kg

D. 0.25 kg

E. 0.35 kg

1099. The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be________________?
0

A. 48

B. none of the above

C. 4-Aug

D. 2-Aug

E. 28

1100. In a typical medium speed, 4-stroke cycle diesel engine ___________________?
0

A. fuelinjection starts at 10 before to dead center and ends at 20 after tor dead center

B. may start and end anywhere

C. fuel injection starts at top dead center and ends at 20 after top dead center

D. fuel injection starts at just before top dead center and ends just after top deac center

E. none of the above

Previous Next

Showing 1081 to 1100 of 4266 mcqs