Bissoy.com
Doctors Medicines MCQs Q&A

Which of the following statements are associated with complete dynamic balancing of rotating systems? 1. Resultant couple due to all inertia forces is zero. 2. Support reactions due to forces are zero but not due to couples. 3. The system is automatically statically balanced. 4. Centre of masses of the system lies on the axis of rotation.

Which of the following statements are associated with complete dynamic balancing of rotating systems? 1. Resultant couple due to all inertia forces is zero. 2. Support reactions due to forces are zero but not due to couples. 3. The system is automatically statically balanced. 4. Centre of masses of the system lies on the axis of rotation. Correct Answer 1, 3 and 4 only

Support reactions due to forces & couple both need to be zero.

Related Questions

Which of the following statements are associated with the complete dynamic balancing of rotating systems? 1. The resultant couple due to all inertia forces is zero. 2. Support reactions due to forces are zero but not due to couples 3. The system is automatically statically balanced. 4. Centre of masses of the system lies on the axis of rotation.
The question given below consists of a statement, followed by three arguments numbered I, II and III. You have to decide which of the arguments is/are ‘strong’ arguments and which is/are ‘weak’ arguments and accordingly choose your answer from the alternatives given below each question. Statement: As part of an effort to address the rising cases of divorces in the country, China's Jiangsu province has introduced a voluntary 'divorce test' for couples planning to end their marriage. Couples who score above 60 may be able to save their marriage, the civil affairs bureau said. Around 34 lakh Chinese couples filed for divorce in 2017. Is this sort of a decision/ test legitimate? Arguments: I. Yes, it is a valid decision and will give couples a chance to save their relationship. II. No, if a couple has decided to end their relationship, such a test won’t be beneficial. III. Yes, there is no harm in giving the test, if they want to separate their ways they can. But there might be a ray of hope that they decide to rethink their decision.
An Internal combustion engine has a connecting rod of mass 2 kg and the distance between the centre of crank and centre of gudgeon pin is 25 cm. The Center of Gravity lies at a point 10 cm from the gudgeon pin along the line of centres. The radius of gyration of this system about an axis through the Center of Gravity perpendicular to the plane of rotation is 11 cm. If two masses are used instead of the connecting rod, one at the gudgeon pin and other at the crank pin, if the angular acceleration of the rod is 23 000 rad/s2, then find the correction couple in N-m.
What is the balancing mass required to balance a mass of 5 kg, at a distance of 2 cm from the axis of rotation? (Assume that balancing mass is placed opposite to the unbalanced mass and 1 cm away from the axis of rotation)
Consider the following statements. A. A balanced diet should include all nutrients along with roughages and water. B. Getting balanced diet is not so expensive. C. Balanced diet requirement is different for different age group. D. Balanced diet depends upon the amount of physical work. Which among the following statements are correct?
A rigid body is rotating about an axis. One force F1 acts on the body such that its vector passes through the axis of rotation. Another force F2 acts on it such that it is perpendicular to the axis of rotation and at a point 5cm from the axis. This force F2 is perpendicular to the radius vector at its point of application. Find the net torque on the body. Let F1 = 10N & F2= 5N.
In a system two masses are used to balance the unbalanced forces. Find the mass of the balancing mass which has to be situated at a distance of 20cm, if the disturbing mass is of 100 Kg having radius of rotation of 0.1m. One of the balancing mass is 30 Kg with RoR of 10cm.
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. $$I$$P) is given by (where, A = Area of the section, $$I$$G = Moment of inertia of the section about an axis passing through its C.G. and h = Distance between C.G. and the parallel axis.)
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. $${I_{\text{P}}}$$) is given by (where, A = Area of the section, $${I_{\text{G}}}$$ = Moment of inertia of the section about an axis passing through its C.G. and h = Distance between C.G. and the parallel axis.)
Which of the following statements with regard to Almond's characterisation of political system are correct? (i) All political systems have political structures. (ii) All political systems do not perform the same functions. (iii) All political systems are not multi-functional. (iv) All political systems are mixed systems in the cultural sense. Choose the correct answer from the code given below :