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MP Sub-Engineer ME: Balancing Quiz 47
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Question 1
If primary direct crank of reciprocating engine makes θ with line of stroke, then what angle will the secondary direct crank makes with the line of stroke?
Question 2
Which of the following statements is correct about the balancing of a mechanical system?
Question 3
In a 4- cylinder 4- stroke in-line IC engine the angle between two successive cranks should be 180º. But this rule is violated for cranks 2 and 3 (i.e. inner cranks) and the angle is made 0º.
This is done to achieve primary force balancing and ______
This is done to achieve primary force balancing and ______
Question 4
The four-stroke six-cylinder in-line engine symmetrical about centre line can be balanced for______.
Question 5
Consider the following statements:
1) Balancing of several masses rotating in the same plane can be effected by a single mass.
2) Balancing of several masses in different planes can be done by 2 masses in 2 planes on either side of the reference plane or on the same side.
3) Reciprocating masses cannot be completely balanced by rotating masses.
4) Secondary unbalanced forces will be negligible compared to primary unbalanced forces.
Which of the above statements are correct?
1) Balancing of several masses rotating in the same plane can be effected by a single mass.
2) Balancing of several masses in different planes can be done by 2 masses in 2 planes on either side of the reference plane or on the same side.
3) Reciprocating masses cannot be completely balanced by rotating masses.
4) Secondary unbalanced forces will be negligible compared to primary unbalanced forces.
Which of the above statements are correct?
Question 6
A single cylinder, four- stroke IC engine rotating at 900 rpm has crank length of 50 mm and a connecting rod length of 200 mm. If the effective reciprocating mass of the engine is 1.2 kg, what is the approximate magnitude of the maximum shaking force’ created by the engine
Question 7
An unbalance couple of magnitude 300 N-m is noticed on a shaft of length 200 cm. The dynamic reactions at the bearings are:
Question 8
Given below are four vee twin engines with different included angles between cylinder axes. Which one of these engines can be completely balanced for primary forces by attaching a single revolving mass opposite to the crank pin?
Question 9
A three cylinder radial engine driven by a common crank of radius r has the cylinders spaced at 
among each other. The mass of the reciprocating parts per cylinder is m kg. The primary unbalance force at a crank shaft speed of 
rad/s is
among each other. The mass of the reciprocating parts per cylinder is m kg. The primary unbalance force at a crank shaft speed of rad/s is Question 10
A statically balanced system is shown in the given figure. Two equal weights of 40 N each with an eccentricity of 20 mm, are placed on opposite sides of the axis in the same axial plane. The dynamic reaction at the support A will be ________ (take g = 10 m/s2).
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