Practice Test: Question Set - 27
1. In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by
- (A) ω sinθ/(n² - sin²θ)1/2
- (B) ω cosθ/(n² - cos²θ)1/2
- (C) ω sinθ/(n² - cos²θ)1/2
- (D) ω cosθ/(n² - sin²θ)1/2
2. The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)
- (A) α = 45° +
φ/2
- (B) α = 45° -
φ/2
- (C) α = 90° + φ
- (D) α = 90° - φ
3. When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.
- (A) Smaller
- (B) Larger
- (C) Either A or
B
- (D) None of
these
4. With single Hooke's joint it is possible to connect two shafts, the axes of which have an angular misalignment up to
- (A) 10°
- (B) 20°
- (C) 30°
- (D) 40°
5. The approximate straight line mechanism is a
- (A) Four bar linkage
- (B) 6 bar linkage
- (C) 8 bar linkage
- (D) 3 bar linkage
6. When a point at the end of a link moves with constant angular velocity, its acceleration will have
- (A) Radial
component only
- (B) Tangential
component only
- (C) Coriolis
component only
- (D) Radial and
tangential components both
7. The minimum force required to slide a body of weight W on a rough horizontal plane is
- (A) W sinθ
- (B) W cosθ
- (C) W tanθ
- (D) W cosecθ
8. The length of a simple pendulum which gives the same frequency as the compound pendulum, is
- (A) kG
+ l₁
- (B) kG²
+ l₁
- (C) (kG²
+ l₁²)/ l₁
- (D) (kG
+ l₁²)/ l₁
9. The unbalanced force due to revolving masses
- (A) Varies
in magnitude but constant in direction
- (B) Varies in
direction but constant in magnitude
- (C) Varies in
magnitude and direction both
- (D) Constant in
magnitude and direction both
10. The maximum fluctuation of energy is the
- (A) Difference
between the maximum and minimum energies
- (B) Sum of the
maximum and minimum energies
- (C) Variations
of energy above and below the mean resisting torque line
- (D) Ratio of the
mean resisting torque to the work-done per cycle
11. An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called
- (A) Addendum
circle
- (B) Dedendum circle
- (C) Pitch circle
- (D) Clearance
circle
12. Which of the following is an example of sliding pair?
- (A) Piston and
cylinder of a reciprocating steam engine
- (B) Shaft with
collars at both ends fitted into a circular hole
- (C) Lead screw
of a lathe with nut
- (D) Ball
and a socket joint
13. Pitch point of a cam is
- (A) A point on
the pitch curve having minimum pressure angle
- (B) A point on
the pitch curve having maximum pressure angle
- (C) Any
point on the pitch curve
- (D) Any point on
the pitch circle
14. The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
- (A) ω² R
cosθ
- (B) ω² (R
- r₁) cosθ
- (C) ω² (R
- r₁) sinθ
- (D) ω² r₁
sinθ
15. Ackermann steering gear consists of
- (A) Sliding pairs
- (B) Turning pairs
- (C) Rolling pairs
- (D) Higher pairs
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