Strength of Materials MCQ Solved Paper for SBI Clerk

1. 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

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

3. The efficiency of Carnot cycle depends upon
A. Temperature limits
B. Pressure ratio
C. Volume compression ratio
D. Cut-off ratio and compression ratio
Answer : A

4. Flow stress corresponds to
A. Fluids in motion
B. Breaking point
C. Plastic deformation of solids
D. Rupture stress
Answer : C

5. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm². Ultimate tensile strength of specimen is
A. 4 tonnes/ cm²
B. 8 tonnes/ cm²
C. 16 tonnes/ cm²
D. 22 tonnes/ cm²
Answer : B

6. 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

7. The stress at which extension of the material takes place more quickly as compared to the increase in load is called
A. Elastic point of the material
B. Plastic point of the material
C. Breaking point of the material
D. Yielding point of the material
Answer : D

8. During which of the following process does heat rejection takes place in Carnot cycle?
A. Isothermal expansion
B. Isentropic expansion
C. Isothermal compression
D. Isentropic compression
Answer : C

9. Mond gas is obtained by
A. Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
B. Carbonisation of bituminous coal
C. Passing steam over incandescent coke
D. Passing air and a large amount of steam over waste coal at about 650°C
Answer : D

10. Those substances which have so far not been resolved by any means into other substances of simpler form are called
A. Elements
B. Compounds
C. Atoms
D. Molecules
Answer : A

11. High air-fuel ratio in gas turbines
A. Increases power output
B. Improves thermal efficiency
C. Reduces exhaust temperature
D. Do not damage turbine blades
Answer : C

12. In an extensive property of a thermodynamic system
A. Extensive heat is transferred
B. Extensive work is done
C. Extensive energy is utilised
D. None of these
Answer : D

13. The efficiency of Stirling cycle is __________ Carnot cycle.
A. Greater than
B. Less than
C. Equal to
D. None of these
Answer : C

14. The value of gas constant (R) in S. I. units is
A. 0.287 J/kgK
B. 2.87 J/kgK
C. 28.7 J/kgK
D. 287 J/kgK
Answer : D

15. A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as
A. Chain riveted joint
B. Diamond riveted joint
C. Crisscross riveted joint
D. Zigzag riveted joint
Answer : A

16. The change of entropy, when heat is absorbed by the gas, is
A. Positive
B. Negative
C. Positive or negative
D. None of these
Answer : A

17. When a gas is heated at constant pressure
A. Its temperature will increase
B. Its volume will increase
C. Both temperature and volume will increase
D. Neither temperature not volume will increase
Answer : C

18. In a reversible adiabatic process, the ratio of T1/T2 is equal to
A. (p₂/p₁)? - 1/ ?
B. (p₁/p₂)? - 1/ ?
C. (v₂/v₁)? - 1/ ?
D. (v₁/v₂)? - 1/ ?
Answer : B

19. 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

20. A steel bar of 5 mm is heated from 25°C to 45°C and it is free to expand. The bar will induce
A. No stress
B. Shear stress
C. Tensile stress
D. Compressive stress
Answer : A

21. If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle
A. More
B. Less
C. Equal
D. Depends on other factors
Answer : C

22. The temperature at which the volume of a gas becomes zero is called
A. Absolute scale of temperature
B. Absolute zero temperature
C. Absolute temperature
D. None of these
Answer : B

23. The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as
A. Element
B. Compound
C. Atom
D. Molecule
Answer : D

24. In open cycle gas turbine plants
A. The indirect heat exchanger and cooler is avoided
B. Direct combustion system is used
C. A condenser is used
D. All of the above
Answer : D

25. If the value of n = 0 in the equation pvn = C, then the process is called
A. Constant volume process
B. Adiabatic process
C. Constant pressure process
D. Isothermal process
Answer : C

26. A close cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
A. Same
B. Lower
C. Higher
D. None of these
Answer : C

27. Impact strength of a material is an index of its
A. Toughness
B. Tensile strength
C. Capability of being cold worked
D. Hardness
Answer : A

28. The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is
A. 23.97 bar
B. 25 bar
C. 26.03 bar
D. 34.81 bar
Answer : C

29. Strain is defined as the ratio of
A. Change in volume to original volume
B. Change in length to original length
C. Change in cross-sectional area to original cross-sectional area
D. Any one of the above
Answer : D

30. Shear stress induced in a shaft subjected to tension will be
A. Maximum at periphery and zero at center
B. Maximum at center
C. Uniform throughout
D. None of the above
Answer : D

31. The efficiency of Joule cycle is
A. Greater than Carnot cycle
B. Less than Carnot cycle
C. Equal to Carnot cycle
D. None of these
Answer : B

32. 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

33. Which is the false statement about true stress strain method?
A. It does not exist
B. It is more sensitive to changes in both metallurgical and mechanical conditions
C. It gives a more accurate picture of the ductility
D. It can be correlated with stress strain values in other tests like torsion, impact, combined stress tests etc.
Answer : A

34. The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called
A. Specific heat at constant volume
B. Specific heat at constant pressure
C. kilo-Joule
D. None of these
Answer : C

35. A circular shaft fixed at, A has diameter D for half of its length and diameter D/2 over the other half, as shown in the below figure. If the rotation of B relative to A is 0.1 radian, the rotation of C relative to B will be

A. 0.4 radian
B. 0.8 radian
C. 1.6 radian
D. 3.2 radian
Answer : C

36. Which of the following statement is correct?
A. The stress is the pressure per unit area
B. The strain is expressed in mm
C. Hook's law holds good upto the breaking point
D. Stress is directly proportional to strain within elastic limit
Answer : D

37. When a system changes its state from one equilibrium state to another equilibrium state, then the path of successive states through which the system has passed, is known as
A. Thermodynamic law
B. Thermodynamic process
C. Thermodynamic cycle
D. None of these
Answer : B

38. When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.
A. Equal to
B. Directly proportional to
C. Inversely proportional to
D. Independent of
Answer : B

39. A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m, and then the hoop stress will be
A. 30 MN/m²
B. 50 MN/m²
C. 100 MN/m²
D. 200 MN/m²
Answer : C

40. If the slenderness ratio for a column is 100, then it is said to be a _________ column.
A. Long
B. Medium
C. Short
D. None of these
Answer : A

41. 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

42. A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called
A. Isothermal process
B. Hyperbolic process
C. Adiabatic process
D. Polytropic process
Answer : C

43. A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum shear stress will be
A. -100 MPa
B. 250 MPa
C. 300 MPa
D. 400 MPa
Answer : B

44. The deformation per unit length is called
A. Tensile stress
B. Compressive stress
C. Shear stress
D. Strain
Answer : D

45. For the same compression ratio, the efficiency of dual combustion cycle is
A. Greater than Diesel cycle and less than Otto cycle
B. Less than Diesel cycle and greater than Otto cycle
C. Greater than Diesel cycle
D. Less than Diesel cycle
Answer : A

46. The extension of a circular bar tapering uniformly from diameter d? at one end to diameter d? at the other end and subjected to an axial pull of P is given by
A. ?l = 4PE/ ?l²
B. ?l = 4?ld²/PE
C. ?l = 4Pl/?Ed?d?
D. ?l = 4PlE/ ?d?d?
Answer : C

47. The materials having same elastic properties in all directions are called
A. Ideal materials
B. Uniform materials
C. Isotropic materials
D. Piratical materials
Answer : C

48. The ratio of maximum shear stress developed in a rectangular beam and a circular beam of the same cross-sectional area is
A. 2/3
B. 3/4
C. 1
D. 9/8
Answer : D

49. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
A. Cracking
B. Carbonisation
C. Fractional distillation
D. Full distillation
Answer : C

50. The entropy of water at 0°C is assumed to be
A. 1
B. 0
C. -1
D. 10
Answer : B