# Practice Test: Question Set - 27

**1. During hot working of metals,**

- (A) Porosity of
the metal is largely eliminated

- (B) Grain
structure of the metal is refined

- (C) Mechanical
properties are improved due of refinement of grains

- (D) All
of the above

**2. The static tooth load should be __________ the dynamic load.**

- (A) Equal to

- (B) Less than

- (C) Greater than

- (D) None of
these

**3. For circumferential joint in boilers, the type of joint used is**

- (A) Butt joint
with single cover plate

- (B) Butt joint
with double cover plate

- (C) Lap joint
with one ring overlapping the other

- (D) Any
one of the above

**4. The efficiency of a riveted joint is equal to**

- (A)

*P*/

_{t }*P*

- (B)

*P*/

_{s }*P*

- (C)

*P*/

_{c }*P*

- (D) Least of

*P*,

_{t}*P*and

_{s}*P*/

_{c}*P*

**5. If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?**

- (A) Maximum
principal stress theory

- (B) Maximum
shear stress theory

- (C) Maximum
strain energy theory

- (D) Maximum
distortion energy theory

**6. An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by**

- (A) Increasing
the length of bar

- (B) Decreasing
the cross-sectional area of the bar

- (C) Decreasing
the modulus of elasticity of the bar

- (D) All of the
above

**7. A localized compressive stress at the area of contact between two members is known as**

- (A) Tensile
stress

- (B) Bending
stress

- (C) Bearing
stress

- (D) Shear stress

**8. According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where**

*n*= Number of rivets per pitch length)- (A) (

*π*/4)

*d²*×

*τ*×

*n*

- (B) 1.875

*×*

*(*

*π*/4)

*d²*

*×*

*τ*×

*n*

- (C) 2 ×

*(*

*π*/4)

*d²*

*×*

*τ*×

*n*

- (D) 3

*×*

*(*

*π*/4)

*d²*×

*τ*×

*n*

**9. A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be**

- (A) 2.5

- (B) 2.8

- (C) 3.0

- (D) 3.5

**10. The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where**

*d*= Nominal diameter of bolt in mm)- (A) 1420

*d*

- (B) 1680

*d*

- (C) 2080

*d*

- (D) 2840

*d*

**11. A connecting rod should be**

- (A) Strong in
buckling about X-axis

- (B) Strong in
buckling about Y-axis

- (C) Equally
strong in buckling about X-axis and Y-axis

- (D) Any one of
the above

**12. Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be**

- (A) 2

- (B) 4

- (C) 8

- (D) 16

**13. A steel containing 0.8% carbon is known as**

- (A) Eutectoid
steel

- (B) Hypereutectoid
steel

- (C) Hypo-eutectoid
steel

- (D) None of
these

**14. Creep in belt is due to**

- (A) Material of
the belt

- (B) Material of
the pulley

- (C) Uneven
extensions and contractions due to varying tension

- (D) All of the
above

**15. Stress concentration factor is defined as the ratio of**

- (A) Maximum
stress to the endurance limit

- (B) Nominal
stress to the endurance limit

- (C) Maximum
stress to the nominal stress

- (D) Nominal
stress to the maximum stress

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