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Mechanical Engineering - Theory of machines

Exercise : Theory of machines - Section 5
21.
Which of the following statement is correct for gears ?
The addendum is less than the dedendum
The pitch circle diameter is the product of module and number of teeth
The contact ratio means the number of pairs of teeth in contact
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be
12
14
18
24
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)
P = W tan(α - φ)
P = W tan(α + φ)
P = W tan(φ - α)
P = W cos(α + φ)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at
45° to each other
90° to each other
120° to each other
180° to each other
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
The coriolis component of acceleration leads the sliding velocity by
45°
90°
135°
180°
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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