# Practice Test: Question Set - 05

**1. A shaft revolving at ω rad/s transmits torque (**

*T*) in Nm. The power developed is- (A)

*T*

*.ω*watts

- (B) 2

*π. T.ω*watts

- (C) 2

*π. T.ω*/75 watts

- (D) 2

*π. T.ω*/4500 watts

**2. The buckling load for a given material depends on**

- (A) Slenderness ratio and
area of cross-section

- (B) Poisson's ratio and
modulus of elasticity

- (C) Slenderness ratio and
modulus of elasticity

- (D) Slenderness ratio,
area of cross-section and modulus of elasticity

**3. 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

**4. 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

**5. The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (**

*σ*and_{x}*σ*) acting at a body across two mutually perpendicular planes. The normal stress on an oblique section making an angle θ with the minor principle plane is given by_{y}- (A)

*OC*

- (B)

*OP*

- (C)

*OQ*

- (D)

*PQ*

**6. A double strap butt joint with equal straps is**

- (A) Always
in single shear

- (B) Always
in double shear

- (C) Either
in single shear or double shear

- (D) None of
these

**7. The stress induced in a body due to suddenly applied load compared to when it is applied gradually is**

- (A) Same

- (B) Half

- (C) Two times

- (D) Four times

**8. The rivets are used for _________ fastenings.**

- (A) Permanent

- (B) Temporary

- (C) Semi-permanent

- (D) None
of these

**9. When two plates are butt together and riveted with cover plates with two rows of rivets, the joint is known as**

- (A) Lap joint

- (B) Butt joint

- (C) Single riveted single cover butt joint

- (D) Double riveted double
cover butt joint

**10. A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be**

- (A) Tensile

- (B) Compressive

- (C) Shear

- (D) Zero

**11. 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

**12. When a thin cylindrical shell is subjected to an internal pressure, the volumetric strain is (where**

*ε₁*= Hoop strain, and*ε₂*= Longitudinal strain)- (A) 2

*ε₁ - ε₂*

- (B) 2

*ε₁*+

*ε₂*

- (C) 2

*ε₂ - ε₁*

- (D) 2

*ε₂*+

*ε₁*

**13. 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

**14. The relation between equivalent length (**

*L*) and actual length (*l*) of a column for both ends fixed is- (A)

*L*=

*l*/2

- (B)

*L*=

*l*/√2

- (C)

*L*=

*l*

- (D)

*L*= 2

*l*

**15. 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

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