Strength of Materials 1000+ MCQ with answer for GRE

1. According to Kelvin-Planck's statement of second law of thermodynamics,
A. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
B. It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
C. It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
D. None of the above
Answer : A

2. A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as
A. Cracking
B. Carbonisation
C. Fractional distillation
D. Full distillation
Answer : A

3. Which is the incorrect statement about Carnot cycle?
A. It is used as the alternate standard of comparison of all heat engines.
B. All the heat engines are based on Carnot cycle.
C. It provides concept of maximising work output between the two temperature limits.
D. All of the above
Answer : B

4. Which of the following is a proper sequence?
A. Proportional limit, elastic limit, yielding, failure
B. Elastic limit, proportional limit, yielding, failure
C. Yielding, proportional limit, elastic limit, failure
D. None of the above
Answer : A

5. The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
A. Zeroth
B. First
C. Second
D. Third
Answer : B

6. One kg of ethylene (C2H4) requires 2 kg of oxygen and produces 22/7 kg of carbon dioxide and __________ kg of water or steam.
A. 9/7
B. 11/7
C. 7/4
D. 1/4
Answer : A

7. A composite shaft consisting of two stepped portions having spring constants K? and K? is held between two rigid supports at the ends. Its equivalent spring constant is
A. K? K?
B. (K? + K?)/ 2
C. (K? + K?)/ K? K?
D. K? K?/ (K? + K?)
Answer : A

8. The heating of a gas at constant pressure is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : B

9. Stirling cycle consists of
A. Two constant volume and two isentropic processes
B. Two constant volume and two isothermal processes
C. Two constant pressure and two isothermal processes
D. One constant volume, one constant pressure and two isentropic processes
Answer : B

10. In an irreversible process, there is a
A. Loss of heat
B. No loss of heat
C. Gain of heat
D. No gain of heat
Answer : A

11. Which of the following cycles is not a reversible cycle?
A. Carnot
B. Ericsson
C. Stirling
D. None of the above
Answer : D

12. The amount of heat generated per kg of fuel is known as
A. Calorific value
B. Heat energy
C. Lower calorific value
D. Higher calorific value
Answer : A

13. The compression ratio for Diesel engines is
A. 3 to 6
B. 5 to 8
C. 15 to 20
D. 20 to 30
Answer : C

14. The natural petroleum may be separated into
A. Petrol
B. Kerosene
C. Fuel oil
D. Lubricating oil
Answer : D

15. One Joule (J) is equal to
A. 1 N-m
B. 1 kN-m
C. 10 N-m/s
D. 10 kN-m/s
Answer : A

16. The maximum shear stress, in the given figure, is equal to __________ of the Mohr's circle.

A. Radius
B. Diameter
C. Circumference
D. Area
Answer : A

17. Petrol is distilled at
A. 65° to 220°C
B. 220° to 345°C
C. 345° to 470°C
D. 470° to 550°C
Answer : A

18. The fuel mostly used in steam boilers is
A. Brown coal
B. Peat
C. Coking bituminous coal
D. Non-coking bituminous coal
Answer : D

19. The gas constant (R) is equal to the
A. Sum of two specific heats
B. Difference of two specific heats
C. Product of two specific heats
D. Ratio of two specific heats
Answer : B

20. When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is
A. Tensile stress
B. Compressive stress
C. Shear stress
D. Thermal stress
Answer : D

21. In a prismatic member made of two materials so joined that they deform equally under axial stress, the unit stresses in two materials are
A. Equal
B. Proportional to their respective moduli of elasticity
C. Inversely proportional to their moduli of elasticity
D. Average of the sum of moduli of elasticity
Answer : B

22. In closed cycle gas turbine, the air is compressed
A. Isothermally
B. Isentropically
C. Polytropically
D. None of these
Answer : B

23. The volumetric or molar specific heat at constant pressure is the product of
A. Molecular mass of the gas and the specific heat at constant volume
B. Atomic mass of the gas and the gas constant
C. Molecular mass of the gas and the gas constant
D. None of the above
Answer : D

24. In order to prevent crushing of masonry at the base of the dam, the maximum stress should be __________ the permissible stress of the soil.
A. Equal to
B. Less than
C. More than
D. None of these
Answer : B

25. Otto cycle is also known as
A. Constant pressure cycle
B. Constant volume cycle
C. Constant temperature cycle
D. Constant temperature and pressure cycle
Answer : B

26. Which of the following is a reversible non-flow process?
A. Isochoric process
B. Isobaric process
C. Hyperbolic process
D. All of these
Answer : D

27. In the below figure, the stress corresponding to point D is

A. Yield point stress
B. Breaking stress
C. Ultimate stress
D. Elastic limit
Answer : C

28. The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).
A. Less than
B. Equal to
C. More than
D. None of these
Answer : C

29. The fuel mostly used in blast furnace for extracting pig iron from iron ores is
A. Hard coke
B. Soft coke
C. Pulverised coal
D. Bituminous coal
Answer : A

30. The fuel mostly used in cement industry and in metallurgical processes is
A. Wood charcoal
B. Bituminous coke
C. Pulverised coal
D. Coke
Answer : C

31. A shaft revolving at ? rad/s transmits torque (T) in Nm. The power developed is
A. T.? watts
B. 2?. T.? watts
C. 2?. T.?/75 watts
D. 2?. T.?/4500 watts
Answer : A

32. In an isothermal process,
A. There is no change in temperature
B. There is no change in enthalpy
C. There is no change in internal energy
D. All of these
Answer : D

33. The efficiency of a gas turbine is given by
A. (Net work output)/(Workdone by the turbine)
B. (Net work output)/(Heat supplied)
C. (Actual temperature drop)/(Isentropic temperature drop)
D. (Isentropic increase in temperature)/(Actual increase in temperature)
Answer : B

34. The state of a substance whose evaporation from its liquid state is complete, is known as
A. Vapour
B. Perfect gas
C. Air
D. Steam
Answer : B

35. The __________ is obtained when carbonisation of coal is carried out at 500° to 700° C.
A. Soft coal
B. Hard coal
C. Pulverised coal
D. Bituminous coal
Answer : A

36. Resilience is the
A. Energy stored in a body when strained within elastic limits
B. Energy stored in a body when strained up to the breaking of the specimen maximum strain
C. Energy which can be stored in a body
D. None of the above
Answer : D

37. The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is
A. Same
B. Twice
C. Four times
D. Eight times
Answer : C

38. Efficiency of a riveted joint is the ratio of its strength (max. load it can resist without failure) to the strength of the un-punched plate in
A. Tension
B. Compression
C. Bearing
D. Any one of the above
Answer : A

39. When the expansion or compression takes place according to the law pvn = C, the process is known as
A. Isothermal process
B. Adiabatic process
C. Hyperbolic process
D. Polytropic process
Answer : D

40. The thickness of a thin cylindrical shell with hemispherical ends is __________ that of spherical ends.
A. Equal to
B. More than
C. Less than
D. None of these
Answer : B

41. The efficiency of Diesel cycle depends upon
A. Temperature limits
B. Pressure ratio
C. Compression ratio
D. Cut-off ratio and compression ratio
Answer : D

42. The atomic mass of nitrogen is __________ oxygen.
A. Equal to
B. Less than
C. More than
D. None of these
Answer : B

43. The entropy may be expressed as a function of
A. Pressure and temperature
B. Temperature and volume
C. Heat and work
D. All of these
Answer : A

44. One kg of carbon monoxide requires _______kg of oxygen to produce 11/7 kg of carbon dioxide gas.
strong>A. 11/7
B. 9/7
C. 4/7
D. All of the above
Answer : C

45. When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the deflection of the spring (?) is given by (where d = Diameter of spring wire, n = No. of turns of the spring, and C = Modulus of rigidity for the spring material)
A. WD3n/Cd?
B. 2WD3n/Cd?
C. 4WD3n/Cd?
D. 8WD3n/Cd?
Answer : D

46. If Th is the torque resisting capacity of a hollow shaft and Ts is that of a solid shaft, of the same material, length and weight. Then,
A. Th > Ts
B. Th < Ts
C. Th = Ts
D. None of these
Answer : A

47. The rivets are used for __________ fastenings.
A. Permanent
B. Temporary
C. Semi-permanent
D. None of these
Answer : A

48. In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called
A. Creeping
B. Yielding
C. Breaking
D. Plasticity
Answer : A

49. When the gas is heated at constant pressure, the heat supplied
A. Increases the internal energy of the gas
B. Increases the temperature of the gas
C. Does some external work during expansion
D. Both (B) and (C)
Answer : D

50. The hard coke is obtained when carbonisation of coal is carried out at
A. 300° to 500°C
B. 500° to 700°C
C. 700° to 900°C
D. 900° to 1100°C
Answer : D