mechanical engineering MCQs – Page 49

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 Review each marked answer and report any item that may be outdated or unclear.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

961. If a load W is applied instantaneously on a bar; then the stress induced in bar will___________________?
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A. increase with increase in y

B. depend on other considerations

C. none of the above

D. be independent of ratio of mass of load W to mass of bar (y)

E. decrease with decrease in y

962. Stress concentration in cyclic loading is____________________?
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A. ch is correct statement ?

B. very serious in brittle materials and less serious in ductile materials

C. very serious in ductile materials and less serious in brittle materials

D. equally serious in both types of materials

E. seriousness would depend on other factors

F. none of the above

963. Gas turbine cycle consists of___________________?
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A. two isentropics, one constant volume and one constant pressure

B. two isothermals and two isentropics

C. two isentropics and two constant pressures

D. none of the above

E. two isentropics and two constant volumes

964. Stress concentration in cyclic loading is more serious in__________________?
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A. ductile materials

B. brittle materials

C. equally serious in both cases

D. depends on other factors

E. unpredictable

965. Which law states that the specific heat of a gas remains constant at all temperatures and pressures______________________?
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A. Charles Law

B. there is no such law

C. Boyles Law

D. Regnaults Law

E. Joules Law

966. The ratio of two specific heats of air is equal to____________________?
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A. 2.71

B. 0.1

C. 0.17

D. 1.41

E. 0.24

967. Intensive property of a system is one whose value____________________?
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A. is dependent on the path followed and not on the state

B. remains constant

C. is not dependent on the path followed but on the state

D. depends on the mass of the system, like volume

E. does not depend on the mass of the system, like temperature, pressure, etc

968. The main disadvantage of the sliding pair is that it is_________________?
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A. difficult to manufacture

B. A. and C. above

C. bulky

D. A. and B. above

E. wears rapidly

969. In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by_________________?
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A. decreasing the cross-section area of bar

B. increasing the cross-section area of bar

C. none of the above

D. remain unaffected with cross-section area

E. would depend upon other factors

970. Brittle coating technique is used for_________________?
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A. protecting metal against corrosion

B. determining brittleness

C. experimental stress analysis

D. protecting metal against wear and tear

E. non-destructive testing of metals

971. Which of the following variables controls the physical properties of a perfect gas_________________?
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A. volume

B. atomic mass

C. temperature

D. pressure

E. all of the above

972. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant________________?
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A. temperature

B. pressure

C. entropy

D. volume

E. internal energy

973. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant_______________?
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A. internal energy

B. entropy

C. volume

D. pressure

E. temperature

974. For same compression ratio and for same heat added_________________?
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A. Otto cycle is more efficient than Diesel cycle

B. Diesel cycle is more efficient than Otto cycle

C. efficiency depends on other factors

D. both Otto and Diesel cycles are equally efficient

E. none of the above

975. Kleins construction can be used to determine acceleration of various parts when the crank is at_________________?
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A. inner dead centre

B. at 45 to the line of the stroke

C. right angles to the link of the stroke

D. all of the above

E. outer dead centre

976. For which of the following substances, the internal energy and enthalpy are the functions of temperature only____________________?
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A. water

B. saturated steam

C. superheated steam

D. perfect gas

E. any gas

977. The pressureof a gas in terms of its mean kinetic energy per unit volume E is equal to________________?
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A. 5E/4

B. 2E/3

C. 3E/4

D. E/2

E. E/3

978. The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that___________________?
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A. rankine cycle is hypothetical

B. a rankine cycle receives heat at two places

C. carnot cycle cant work with saturated steam

D. none of the above

E. heat is supplied to water at temperature below the maximum temperature of the cycle

979. Kinetic theory of gases assumes that the collisions between the molecules are________________?
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A. perfectly inelastic

B. partly inelastic

C. partly elastic and partly inelastic

D. perfectly elastic

E. partly elastic

980. If the opposite links of a four bar linkage are equal, the links will always form a_________________?
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A. trapezoid

B. rectangle

C. pentagon

D. triangle

E. parallelogram

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