# Practice Test: Question Set - 21

**1. When spring index increases, the value of Wahl's stress factor**

- (A) Increases
linearly

- (B) Decreases
linearly

- (C) Remains
same

- (D) Increases
exponentially

**2. In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.**

- (A) Half

- (B) Twice

- (C) Thrice

- (D) None of
these

**3. A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.**

- (A) Equal to

- (B) Less than

- (C) Greater than

- (D) None of
these

**4. The material commonly used for crane hooks is**

- (A) Cast iron

- (B) Wrought iron

- (C) Mild steel

- (D) Aluminium

**5. A leaf spring in automobiles is used**

- (A) To apply
forces

- (B) To measure
forces

- (C) To absorb
shocks

- (D) To
store strain energy

**6. The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 +**

*v)*.- (A) 10 m/s

- (B) 12.5 m/s

- (C) 15 m/s

- (D) 20 m/s

**7. When a circular beam of diameter**

*d*is subjected to a shear force*F*, the maximum shear stress induced will be- (A) 4

*F/ πd²*

- (B) 6

*F/ πd²*

- (C) 8

*F/ πd²*

- (D) 16

*F/ 3πd²*

**8. According to Indian standards, total numbers of fundamental deviations are**

- (A) 10

- (B) 15

- (C) 20

- (D) 25

**9. The most important dimension in the design of a nut is**

- (A) Pitch
diameter

- (B) Inside
diameter

- (C) Outside
diameter

- (D) Height

**10. When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is**

- (A) Tensile
stress

- (B) Compressive
stress

- (C) Shear stress

- (D) Bending
stress

**11. If**

*T₁*and*T₂*are the tensions on the tight and slack sides of the belt respectively, and*T*is the centrifugal tension, then initial tension in the belt is equal to_{c}- (A)

*T₁ -*

*T₂ + T*

_{c}- (B)

*T₁*+

*T₂*+

*T*

_{c}- (C)

*(T₁ - T₂ + T*/2

_{c})- (D)

*(T₁*+

*T₂*+

*T*/2

_{c})**12. The relation between the pitch of the chain (**

*p*) and pitch circle diameter of the sprocket (*D*) is given by (where*T*= Number of teeth on the sprocket)- (A)

*p = D sin*(90°/

*T*)

- (B)

*p = D sin*(120°/

*T*)

- (C)

*p = D sin*(180°/

*T*)

- (D)

*p = D sin*(360°/

*T*)

**13. Cast iron pipes are mainly used**

- (A) For
conveying steam

- (B) In water and
sewage systems

- (C) In
pressure lubrication systems on prime movers

- (D) All
of the above

**14. The modulus of elasticity for mild steel is approximately equal to**

- (A) 80 kN/mm²

- (B) 100 kN/mm²

- (C) 110 kN/mm²

- (D) 210 kN/mm²

**15. If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited**

- (A) Square

- (B) Acme

- (C) Buttress

- (D) BSW

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