Practice Test: Question Set - 20
1. A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is
- (A) 3.6 N/mm²
compression
- (B) 3.6 N/mm²
tension
- (C) 7.2 N/mm²
compression
- (D) 7.2 N/mm²
tension
2. When the screw in a mechanical screw jack rotates, the load kept on the top of it moves
- (A) Axially
upwards
- (B) Axially
downwards
- (C) Axially
upwards or downwards
- (D) None of
these
3. A bolt of M 24 × 2 means that
- (A) The pitch of
the thread is 24 mm and depth is 2 mm
- (B) Cross-sectional
area of the threads is 24 mm²
- (C) The nominal
diameter of bolt is 24 mm and pitch is 2 mm
- (D) The
effective diameter of bolt is 24 mm and there are 2 threads per cm
4. Oldham coupling is used to connect two shafts
- (A) Which are
perfectly aligned
- (B) Which
are not in exact alignment
- (C) Which
have lateral misalignment
- (D) Whose axes
intersect at a small angle
5. The size of a cam depends upon
- (A) Base circle
- (B) Pitch circle
- (C) Prime circle
- (D) Pitch curve
6. According to I.B.R., the factor of safety of riveted joint should not be less than
- (A) 1
- (B) 2
- (C) 3
- (D) 4
7. When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is
- (A) 0.20
- (B) 0.35
- (C) 0.50
- (D) 0.65
8. A hollow saddle key is
- (A) A taper key
which fits half in the key way of hub and half in the key way of shaft
- (B) A taper key
which fits in a key way of the hub and is flat on the shaft
- (C) A taper key
which fits in a key way of the hub and the bottom of the key is shaped to fit
the curved surface of the shaft
- (D) Provided in
pairs at right angles and each key is to withstand torsion in one direction
only
9. A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,
- (A) Hollow
saddle key
- (B) Hollow key
- (C) Soft key
- (D) None of
these
10. When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a
- (A) Short
bearing
- (B) Long bearing
- (C) Medium
bearing
- (D) Square
bearing
11. In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that
- (A) The
effect of curvature of the cylinder wall is neglected
- (B) The tensile
stresses are uniformly distributed over the section of the walls
- (C) The effect
of the restraining action of the heads at the end of the pressure vessel is neglected
- (D) All of the
above
12. Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by
- (A) (k₁ k₂)/
(k₁ + k₂)
- (B) (k₁ -
k₂)/ (k₁ + k₂)
- (C) (k₁ +
k₂)/ (k₁ k₂)
- (D) (k₁ -
k₂)/ (k₁ k₂)
13. The cross-section of the arm of a bell crank lever is
- (A) Rectangular
- (B) Elliptical
- (C) I-section
- (D) Any one of
these
14. Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that
- (A) Shaft B is
better than shaft A
- (B) Shaft A is
better than shaft B
- (C) Both the
shafts are equally good
- (D) None of
these
15. The connecting rod bolts are tightened up with initial tension greater than the external load so that
- (A) Joint
may not open up
- (B) Bolts
are weakest elements
- (C) The resultant load on the
bolt would not be affected by the external cyclic load
- (D) Bolts will not loosen during
service
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