# 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*sin

*θ*

- (B)

*W*cos

*θ*

- (C)

*W*tan

*θ*

- (D)

*W*cosec

*θ*

**8. The length of a simple pendulum which gives the same frequency as the compound pendulum, is**

- (A)

*k*+

_{G}*l₁*

- (B)

*k*+

_{G}²*l₁*

- (C) (

*k*+

_{G}²*l₁²)/ l₁*

- (D) (

*k*+

_{G}*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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