Explore topic-wise MCQs in Machine Design.

This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Design knowledge and support exam preparation. Choose a topic below to get started.

1.

If a hollow steel tube is heated from a temperature of 25’C to 250’C then fid the expansion of tube if area of the cross section is 300mm²,length of tube=200mm and coefficient of thermal expansion is 10.8 x 10⁻⁶ per ⁰C.

A. 1.22mm
B. 0.486mm
C. 0.878mm
D. 1.52mm
Answer» C. 0.878mm
Discussion
2.

A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm² and considering combined effect of direct stress and bending stress.

A. 15.8mm
B. 14.35mm
C. 17.9mm
D. 18.1mm
Answer» C. 17.9mm
Discussion
3.

A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm² and considering only direct tensile stress.

A. 4.7mm
B. 6.8mm
C. 13.95mm
D. 3.4mm
Answer» E.
Discussion
4.

A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm².Considering only bending stress.

A. 14.80mm
B. 13.95mm
C. 16.5mm
D. 17.2mm
Answer» C. 16.5mm
Discussion
5.

If for a curved beam of trapezoidal cross section, radius of neutral axis is 89.1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load.

A. 97.3
B. 95.8
C. 100.6
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
6.

A_CURVED_BEAM_WITH_ECCENTRICITY_0.02D_IS_LOADED_WITH_1KN.CENTROIDAL_RADIUS=4D_AND_INNER_AND_OUTER_RADII_ARE_3.5D_AND_4.5D_RESPECTIVELY._AREA_OF_CROSS_SECTION_IS_0.8D¬¨ â§._FIND_THE_DIMENSION_D_IF_ALLOWABLE_STRESS_IS_110N/MM¬¨ â§_AND_CONSIDERING_ONLY_DIRECT_TENSILE_STRESS.?$#

A. 4.7mm
B. 6.8mm
C. 13.95mm
D. 3.4mm
Answer» E.
Discussion
7.

If a hollow steel tube is heated from a temperature of 25’C to 250’C then fid the expansion of tube if area of the cross section is 300mm²,length of tube=200mm and coefficient of thermal expansion is 10.8 x 10⁻⁶ per ⁰C.$#

A. 1.22mm
B. 0.486mm
C. 0.878mm
D. 1.52mm
Answer» C. 0.878mm
Discussion
8.

A_curved_beam_with_eccentricity_0.02D_is_loaded_with_1kN.Centroidal_radius=4D_and_inner_and_outer_radii_are_3.5D_and_4.5D_respectively._Area_of_cross_section_is_0.8D²._Find_the_dimension_D_if_allowable_stress_is_110N/mm²_and_considering_combined_effect_of_direct_stress_and_bending_stress.$#

A. 15.8mm
B. 14.35mm
C. 17.9mm
D. 18.1mm
Answer» C. 17.9mm
Discussion
9.

Residual stresses are always added in the load stresses and hence are always harmful.

A. True
B. False
Answer» C.
Discussion
10.

All type of stresses vanishes after as soon as the applied load is removed.

A. True
B. False
Answer» C.
Discussion
11.

A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm².Considering only bending stress?#

A. 14.80mm
B. 13.95mm
C. 16.5mm
D. 17.2mm
Answer» C. 16.5mm
Discussion
12.

If for a curved beam of trapezoidal cross section, radius of neutral axis is 89.1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load.$

A. 97.3
B. 95.8
C. 100.6
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
13.

The bending stress in a straight beam varies linearly with the distance from neural axis like that in a curved beam.

A. True
B. False
Answer» C.
Discussion
14.

A curved beam has neutral axis is curved while loaded and straight when unloaded.

A. True
B. False
Answer» C.
Discussion
15.

How many modes are there for crack propagation?

A. 2
B. 3
C. 4
D. 5
Answer» C. 4
Discussion
16.

Fracture toughness does not depend upon geometry of the part containing crack

A. True
B. False
Answer» C.
Discussion
17.

The critical value at which crack extension occurs is called

A. Stress Intensity Factor
B. Toughness
C. Fracture Toughness
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
18.

Stress intensity factor is the critical value of stress at which crack extension occurs.

A. True
B. False
Answer» C.
Discussion