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GMAT - Strength of Materials 1000+ MCQ [Solved] PDF Download

Thursday 9th of March 2023

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1. The processes occuring in open system which permit the transfer of mass to and from the system, are known as
A. Flow processes
B. Non-flow processes
C. Adiabatic processes
D. None of these
Answer : A
2. The heat and mechanical energies are mutually convertible. This statement was established by
A. Boyle
B. Charles
C. Joule
D. None of these
Answer : C
3. The compression ratio for petrol engines is
A. 3 to 6
B. 5 to 8
C. 10 to 20
D. 15 to 30
Answer : B
4. 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
5. Which of the following is correct?
A. Gauge pressure = Absolute pressure + Atmospheric pressure
B. Absolute pressure = Gauge pressure + Atmospheric pressure
C. Absolute pressure = Gauge pressure - Atmospheric pressure
D. Atmospheric pressure = Absolute pressure + Gauge pressure
Answer : B
6. If a part is constrained to move and heated, it will develop
A. Principal stress
B. Tensile stress
C. Compressive stress
D. Shear stress
Answer : C
7. Hooke's law holds good up to
A. Yield point
B. Limit of proportionality
C. Breaking point
D. Elastic limit
Answer : B
8. 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
9. The main cause for the irreversibility is
A. Mechanical and fluid friction
B. Unrestricted expansion
C. Heat transfer with a finite temperature difference
D. All of the above
Answer : D
10. Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B' The ratio of deflections in spring 'A' to spring 'B' is
A. 1/8
B. 1/4
C. 1/2
D. 2
Answer : C
11. Volumetric strain for a rectangular specimen of length l, breadth b and thickness t subjected to a pull of P is given by
A. e (1 - 2m)
B. e (1 - 2/m)
C. e (m - 2)
D. e (2/m - 1)
Answer : B
12. When both ends of a column are fixed, the effective length is
A. Its own length
B. Twice its length
C. Half its length
D. 1/?2 × its length
Answer : C
13. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be
A. 400 MPa
B. 500 MPa
C. 900 MPa
D. 1400 MPa
Answer : D
14. In closed cycle gas turbine, the air is compressed
A. Isothermally
B. Isentropically
C. Polytropically
D. None of these
Answer : B
15. The bending moment at a point on a beam is the algebraic ________ of all the moments on either side of the point.
A. Sum
B. Difference
C. Multiplication
D. None of the above
Answer : A
16. The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)
A. t
B. 2t
C. 4t
D. 8t
Answer : C
17. If percentage reduction in area of a certain specimen made of material 'A' under tensile test is 60% and the percentage reduction in area of a specimen with same dimensions made of material 'B' is 40%, then
A. The material A is more ductile than material B
B. The material B is more ductile than material A
C. The ductility of material A and B is equal
D. The material A is brittle and material B is ductile
Answer : A
18. In a free expansion process,
A. W1 - 2 = 0
B. Q1 - 2 = 0
C. dU = 0
D. All of these
Answer : D
19. Reversed Joule cycle is known as
A. Carnot cycle
B. Bell-Coleman cycle
C. Rankine cycle
D. Stirling cycle
Answer : B
20. The efficiency of Ericsson cycle is __________ Carnot cycle.
A. Greater than
B. Less than
C. Equal to
D. None of these
Answer : C
21. The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
Answer : A
22. The torque transmitted by a solid shaft of diameter (D) is (where ? = Maximum allowable shear stress)
A. ? /4 × ? × D³
B. ? /16 × ? × D³
C. ? /32 × ? × D³
D. ? /64 × ? × D³
Answer : B
23. The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
A. Workdone
B. Entropy
C. Enthalpy
D. None of these
Answer : C
24. The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of
A. 0.224 litres
B. 2.24 litres
C. 22.4 litres
D. 224 litres
Answer : C
25. 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
26. 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
27. According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
A. First kind
B. Second kind
C. Third kind
D. None of these
Answer : B
28. One kg of carbon monoxide requires _______kg of oxygen to produce 11/7 kg of carbon dioxide gas.
A. 11/7
B. 9/7
C. 4/7
D. All of the above
Answer : C
29. 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
30. When gas is heated at constant pressure, the heat supplied is utilised in
A. Increasing the internal energy of gas
B. Doing some external work
C. Increasing the internal energy of gas and also for doing some external work
D. None of the above
Answer : C
31. When shear force at a point is zero, then bending moment is _________ at that point.
A. Zero
B. Minimum
C. Maximum
D. Infinity
Answer : C
32. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
A. 0.086
B. 1.086
C. 1.086
D. 4.086
Answer : B
33. 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
34. Kerosene is distilled at
A. 65° to 220°C
B. 220° to 345°C
C. 345° to 470°C
D. 470° to 550°C
Answer : B
35. For same compression ratio and for same heat added
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
Answer : A
36. Which of the following is an intensive property of a thermodynamic system?
A. Volume
B. Temperature
C. Mass
D. Energy
Answer : B
37. The strain energy stored in a solid circular shaft subjected to shear stress (?), is: (Where G = Modulus of rigidity for the shaft material)
A. ?²/ 2G × Volume of shaft
B. ?/ 2G × Volume of shaft
C. ?²/ 4G × Volume of shaft
D. ?/ 4G × Volume of shaft
Answer : A
38. The shear force at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre, is
A. Zero
B. wl/4
C. wl/2
D. wl²/2
Answer : A
39. Which of the following is the correct statement?
A. All the reversible engines have the same efficiency.
B. All the reversible and irreversible engines have the same efficiency.
C. Irreversible engines have maximum efficiency.
D. All engines are designed as reversible in order to obtain maximum efficiency.
Answer : C
40. A cycle consisting of two isothermal and two isentropic processes, is known as
A. Carnot cycle
B. Stirling cycle
C. Ericsson cycle
D. Joule cycle
Answer : A
41. 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
42. Carbonisation of coal consists of
A. Drying and crushing the coal to a fine powder
B. Moulding the finely ground coal under pressure with or without a binding material
C. Heating the wood with a limited supply of air to temperature not less than 280°C
D. None of the above
Answer : D
43. 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
44. Otto cycle consists of following four processes
A. Two isothermals and twoisentropic
B. Two isentropic and two constant volumes
C. Two isentropic, one constant volume and one constant pressure
D. Two isentropic and two constant pressures
Answer : B
45. The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by
A. Kelvin
B. Joule
C. Clausis
D. Gay-Lussac
Answer : C
46. 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
47. The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. All of these
Answer : D
48. A simply supported beam with a gradually varying load from zero at B and w per unit length at A is shown in the below figure. The shear force at B is equal to
A. wl/6
B. wl/3
C. wl
D. 2wl/3
Answer : A
49. The absolute zero temperature is taken as
A. -273°C
B. 73°C
C. 237°C
D. -237°C
Answer : A
50. The fuel mostly used in steam boilers is
A. Brown coal
B. Peat
C. Coking bituminous coal
D. Non-coking bituminous coal
Answer : D
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