# Practice Test: Question Set - 19

**1. The helix angle for double helical gears may be made up to**

- (A) 45°

- (B) 60°

- (C) 75°

- (D) 90°

**2. The bending moment ‘**

*M’*and a torque ‘*T’*is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then ‘*M’*is equal to- (A)

*T*/2

- (B)

*T*

- (C) 2

*T*

- (D) 4

*T*

**3. The distribution of the forces along the length of key fitted in a shaft**

- (A) Varies
linearly

- (B) Is uniform
throughout

- (C) Varies
exponentially, being more near the torque-input end

- (D) Varies
exponentially, being less near the torque-input end

**4. According to Indian standard specifications, 100 H6/g5 means that**

- (A) Tolerance
grade for the hole is 6 and for the shaft is 5

- (B) Tolerance
grade for the shaft is 6 and for the hole is 5

- (C) Tolerance
grade for the shaft is 4 to 8 and for the hole is 3 to 7

- (D) Tolerance
grade for the hole is 4 to 8 and for the shaft is 3 to 7

**5. In designing a flange coupling, the pitch circle diameter of bolts is taken as (where**

*d*= Diameter of the shaft)

- (A) 2

*d*

- (B) 3

*d*

- (C) 4

*d*

- (D) 5

*d*

**6. A column of length**

*l*is fixed at both ends. The equivalent length of the column is- (A)

*l*/2

- (B)

*l*/√2

- (C)

*l*

- (D) 2

*l*

**7. The notch sensitivity**

*q*is expressed in terms of fatigue stress concentration factor*K*theoretical stress concentration factor_{f}and*K*as_{t}

- (A)

*(K*

_{f}*+ 1)/ (K*

_{t}+ 1)- (B)

*(K*

_{f}*- 1)/ (K*

_{t}- 1)- (C)

*(K*+

_{t}*1)/ (K*+

_{f}*1)*

- (D)

*(K*

_{t}- 1)/ (K_{f}- 1)**8. If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio**

- (A) Increases

- (B) Decreases

- (C) Remains
unchanged

- (D) None of
these

**9. A type of brake commonly used in motor cars is a**

- (A) Shoe brake

- (B) Band and
block brake

- (C) Band brake

- (D) Internal
expanding brake

**10. Which of the following property is essential for spring materials?**

- (A) Stiffness

- (B) Ductility

- (C) Resilience

- (D) Plasticity

**11. The objective of caulking in a riveted joint is to make the joint**

- (A) Free
from corrosion

- (B) Stronger in
tension

- (C) Free from
stress

- (D) Leak-proof

**12. The bending stress in a curved beam is**

- (A) Zero at the
centroidal axis

- (B) Zero at the
point other than centroidal axis

- (C) Maximum at
the neutral axis

- (D) None of
these

**13. Rankine Gordon formula for buckling is valid for**

- (A) Long column

- (B) Short column

- (C) Short
and long column

- (D) Very long
column

**14. In the levers of third type, the mechanical advantage is __________ one.**

- (A) Less than

- (B) Equal to

- (C) More than

- (D) None of
these

**15. The maximum efficiency of a square threaded screw is**

- (A)

*(1 - sinφ)/ (1*+

*sinφ)*

- (B)

*(1*+

*sinφ)/ (1 - sinφ)*

- (C)

*(1 - sinφ)/ (1*+

*cosφ)*

- (D)

*(1*+

*cosφ)/ (1 - sinφ)*

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