A shaft is said to be in pure torsion ifa. Turning moment is applied at one end and other end is free b. Turning force is applied at one end and other end is free c. Two opposite turning moments are applied to the shaft d. Combination of torsional load and bending load is applied to the shaft (Ans: c) Which material is suitable for shaft material? a. High speed steel b. Stainless steel or high carbon steel c. Grey cast iron d. Steel having approx. 0.4% carbon and 0.8% manganese (Ans: d) Torsional rigidity is defined as a. T/θ b. Cθ c. CIp d. =θ Where, T=Torque, θ=Angle of twist, Ip = Polar moment of inertia, C=Shearing modulus of elasticity/Column length (Ans: c) Which of the following is not an assumption in derivation of torsion equation? a. Circular shaft remains circular after twisting b. Plane section of the shaft remain plane after twisting c. Material of shaft is isotropic d. Angle of twist is proportional to radius (Ans: d) A hollow prismatic beam of circular section is subjected to a torsional moment. The maximum shear stress occurs at (a) inner wall of cross section (b) middle of thickness (c) outer surface of shaft (d) none of these (Ans: c) Q. At fully plastic twisting moment (a) only fibres at surface are stressed to yield point in shear (b) fibres at centre are stressed to yield point in shear (c) all fibres are stressed to yield point in shear (d) none of these (Ans: c) The load required to produce a unit deflection in the spring is called (a) Modulus of Rigidity (b) Spring stiffness (c) Flexural rigidity (d) Tensional rigidity (Ans: b) In spring balances.8. the spring is used (a) To apply forces (b) To absorb shocks (c) To store strain energy (d) To measure forces (Ans: d) The most important property for the spring material is (a) High elastic limit (b) High deflection value (c) Resistance to fatigue and shock (d) All of these (Ans: d) . the spring is used to store energy.The springs in brakes and clutches are used (a) To apply forces (b) To measure forces (c) To absorb shocks (d) To absorb strain energy (Ans: a) In a watch. The energy is released (a) To stop the watch (b) To run the watch (c) To change the time (d) All of these (Ans: b) A spring used to absorb shocks and vibrations is (a) Close-coil helical spring (b) Open coiled helical spring (c) Spiral spring (d) Leaf spring (Ans: d) . buckling occurs as compared to bending under a (a) Lesser load (b) Larger load (c) Equal load (d) None (Ans: a) .The spring used in mechanical toys is (a) Leaf spring (b) Spiral spring (c) Helical spring (d) All of these (Ans: b) Bending of beam occurs under (a) Axial load (b) Transverse load (c) Direct load (d) None (Ans: b) Buckling of a column occurs under (a) Axial load (b) Transverse load (c) Direct load (d) None (Ans: a) Pure Buckling occurs in a (a) Short column (b) Medium Column (c) Long column (d) None (Ans: c) Pure Buckling uses the equation of (a) Rankin-Gordon (b) Euler (c) Stiffness (d) None (Ans: b) With identical beam and column. Nature of stresses produced in buckling and bending are (a) Same (b) Different (c) Only tensile (d) None (Ans: a) Keeping loading same but increasing the length. The load at which a vertical compression member just buckles is known as (a) Critical load . normal stresses in a long column will (e) Increase (f) Decrease (g) No change (h) None (Ans: b) A long column with fixed ends can carry load as compared to both ends hinged (a) 4 times (b) 8 times (c) 16 times (d) None (Ans: a) A long column with fixed ends can carry load as compared to cantilever column (e) 4 times (f) 8 times (g) 16 times (h) None (Ans: c) 1. normal stresses in a beam will (a) Increase (b) Decrease (c) No change (d) None (Ans: a) Keeping loading same but increasing the length. shear stresses in a beam will (a) Increase (b) Decrease (c) No change (d) None (Ans: c) Keeping loading same but increasing the length. A column whose slenderness ratio is greater than 120 is known as (a) Short column (b) Long column (c) Medium column (d) Composite column Question.4. The direct stress included in a long column is…………. A column that fails due to direct stress is called (a) Short column (b) Long column (c) Medium column (d) Slender column Question.3.2. (a) More (b) Less (c) Same .(b) Crippling load (c) Buckling load (d) Any one of these Question. as compared to bending stress.. 7. (a) Less than (b) More than (c) Equal to (d) None of these Question.. For long columns.crushing load. the value of buckling load is…………….5. The slenderness ratio is the ratio of (a) Length of column to least radius of gyration (b) Moment of inertia to area of cross-section (c) Area of cross-section to moment of inertia (d) Least radius of gyration to length of the column Question.(d) Negligible Question. Compression members always tend to buckle in the direction of (a) Vertical axis (b) Horizontal axis (c) Minimum cross-section (d) Least radius of gyration .6. The Rankine formula holds good for (a) Short column (b) Long column (c) Medium column (d) Both short and long column Question.with both ends hinged.13.Question.9. (a) 2 m (b) 1 m (c) 3 m (d) 6 m Question.10. Rankine’s formula is generally used when slenderness ratio lies in between (a) 0-60 (b) 0-80 (c) 0-100 (d) Any value . A column of length 4m with both ends fixed may be considered as equivalent to a column of length …………. 14.Question. Euler’s formula is not valid for mild steel column when slenderness ratio is (a) More than 100 (b) Less than 100 (c) Less than 80 (d)More than 80 Bending of beam occurs under (a) Axial load (b) Transverse load (c) Direct load (d) None (Ans: b) Buckling of a column occurs under (a) Axial load (b) Transverse load (c) Direct load (d) None (Ans: a) Pure Buckling occurs in a (a) Short column (b) Medium Column (c) Long column (d) None (Ans: c) Pure Buckling uses the equation of (a) Rankin-Gordon (b) Euler (c) Stiffness (d) None (Ans: b) A steel column is a short column when the slenderness ratio is (a) >120 (b) <30 . buckling occurs as compared to bending under a (a) Lesser load (b) Larger load (c) Equal load (d) None (Ans: a) Nature of stresses produced in buckling and bending are (a) Same (b) Different (c) Only tensile (d) None (Ans: a) .(c) >30 (d) None (Ans: b) A steel column is a long column when the slenderness ratio is (a) >120 (b) <30 (c) >30 (d) None (Ans: a) A steel column is a short column when the slenderness ratio is (a) >120 (b) <30 (c) >30 (d) None (Ans: b) A steel column is a short column when the slenderness ratio is (a) >120 (b) <30 (c) >30 (d) None (Ans: b) A steel column is a short column when the slenderness ratio is (a) >120 (b) <30 (c) >30 (d) None (Ans: b) A steel column is a medium column when the slenderness ratio is (a) >120 (b) <30 (c) >30 (d) None (Ans: c) With identical beam and column. normal stresses in a beam will (a) Increase (b) Decrease (c) No change (d) None (Ans: a) Keeping loading same but increasing the length. normal stresses in a long column will (e) Increase (f) Decrease (g) No change (h) None (Ans: b) A long column with fixed ends can carry load as compared to both ends hinged (a) 4 times (b) 8 times (c) 16 times (d) None (Ans: a) A long column with fixed ends can carry load as compared to cantilever column (e) 4 times (f) 8 times (g) 16 times (h) None (Ans: c) A spring is designed for (a) Higher strength (b) Higher deflection (c) Higher stiffness (d) None (Ans: b) A carriage spring is designed on the basis of (a) Shear (b) Compression (c) Bending (d) None (Ans: c) .Keeping loading same but increasing the length. shear stresses in a beam will (a) Increase (b) Decrease (c) No change (d) None (Ans: c) Keeping loading same but increasing the length. A closed helical spring under axial load is designed on the basis of (a) Shear (b) Compression (c) Bending (d) None (Ans: a) A closed helical spring under axial torque is designed on the basis of (a) Shear (b) Compression (c) Bending (d) None (Ans: c) A open helical spring under axial torque is designed on the basis of (a) Shear (b) Compression (c) Bending (d) None (Ans: d) Spring index is (a) D – d (b) D/d (c) D2 –d2 (d) None (Ans: b) Wahl’s stress concentration factor is (a) (4C – 1)/ (4C – 3) + 0.615/C (b) (4C – 1)/ (4C – 2) + 0.615/C (d) None (Ans: c) Resilience of spring is (a) Strain energy per unit length (b) Strain energy per unit area (c) Strain energy per unit mass (d) None (Ans: d) Wahl’s stress concentration factor is used in close coiled springs under axial load to account for (a) Shear effect (b) Bending effect (c) Compression effect (d) none (Ans:b) .615/C (c) (4C – 1)/ (4C – 4) + 0. bending and shear strengths (c) Strain energy.There are number of laminations in a (a) Close coiled spring (b) Open coiled spring (c) Spiral spring (d) None (Ans: d) Most important features of any spring are (a) Deflection. deflection and strength (d) None (Ans: c) Value of Wahl’s stress concentration factor is always (a) > 1 (b) = 1 (c) < 1 (d) None (Ans: a) The most common value of spring index lies between (a) 0 and 5 (b) 5 and 10 (c) 10 and 15 (d) None (Ans: b) Laminated springs are used in (a) Watches (b) Sofas . stiffness and strength (b) Stiffness. (c) Motorcycles (d) None (Ans: d) .