Civil Engineering (CE) Exam  >  Civil Engineering (CE) Tests  >  Engineering Mechanics  >  Test; Moment Of A Force On A Specified Axis - Civil Engineering (CE) MCQ

Test; Moment Of A Force On A Specified Axis - Civil Engineering (CE) MCQ


Test Description

15 Questions MCQ Test Engineering Mechanics - Test; Moment Of A Force On A Specified Axis

Test; Moment Of A Force On A Specified Axis for Civil Engineering (CE) 2024 is part of Engineering Mechanics preparation. The Test; Moment Of A Force On A Specified Axis questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test; Moment Of A Force On A Specified Axis MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test; Moment Of A Force On A Specified Axis below.
Solutions of Test; Moment Of A Force On A Specified Axis questions in English are available as part of our Engineering Mechanics for Civil Engineering (CE) & Test; Moment Of A Force On A Specified Axis solutions in Hindi for Engineering Mechanics course. Download more important topics, notes, lectures and mock test series for Civil Engineering (CE) Exam by signing up for free. Attempt Test; Moment Of A Force On A Specified Axis | 15 questions in 30 minutes | Mock test for Civil Engineering (CE) preparation | Free important questions MCQ to study Engineering Mechanics for Civil Engineering (CE) Exam | Download free PDF with solutions
Test; Moment Of A Force On A Specified Axis - Question 1

Determine the moment’s magnitude produce by the force as shown in the diagram, which tends to rotate the rod ORQP along QP.

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 1

The use of the formula A.(rxF) gives the answer. In which A is 0.89i + 0.447j m. And the force is 300N, which is being applied at the end of the rod. Thus, after finding the equation of the axis and then replacing it in the equation shown above we get the answer. Actually, the main task is to know the axis equation in the vector form. Then get the magnitude of the moment.

Test; Moment Of A Force On A Specified Axis - Question 2

The calculation of the moment about the axis and the moment about any point by a force applied on the body are different from each other.

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 2

The calculation of the moment about the axis and the moment about any point by a force applied on the body are different from each other. It is because both of the calculations require different formulas. And both of the formulas have different inputs, which is obviously different.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test; Moment Of A Force On A Specified Axis - Question 3

In the calculation of the moment of the force about the axis, the cross product table, i.e. the 3X3 matrix which is made for doing the cross product having 3 rows, contains three elements. Which are they from top to bottom?

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 3

The 3X3 matrix which is being made is having axis coordinates, point coordinates and the force coordinates. They are from top to bottom placed. The order cannot be changed. Or if changed then one needs to apply the negative sign appropriately. Negative because the directions gets reversed.

Test; Moment Of A Force On A Specified Axis - Question 4

Which of the following is correct? (For A representing the vector representation of the axis of rotation, r the radius vector and F the force vector)

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 4

The correct form of the equation is given by A.(rxF). Where A represents the vector representation of the axis of rotation, r the radius vector and F the force vector. This is usually done for determining the moment of the force about the axis. That is if body is being rotated by the force about an axis.

Test; Moment Of A Force On A Specified Axis - Question 5

In the equation A.(rxF), the r vector is what?

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 5

The r in the equation A.(rxF) is the radius vector. That is it is the vector which is having the start point at the axis and the end point at the point of action of the force on the body. This vector is being crossed by the force vector, which is then followed by the dot product with the axis vector.

Test; Moment Of A Force On A Specified Axis - Question 6

The axis vector in the calculation of the moment along the axis of rotation is the axis which is collinear with the force vector.

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 6

The axis of the rotation cannot be collinear with the force vector. If it does so then the rotation of body is not possible. That is the moment of the force is zero. Which means no rotation being given by the force along the axis of rotation of the body.

Test; Moment Of A Force On A Specified Axis - Question 7

Which of the following is correct?

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 7

As moment is a vector, we can represent it in the vector form easily. Whether it may be the moment of the force acting on the body about the axis, or about the point. We can also convert the same in the Cartesian form too. The only thing we need to do is the cross product of the radius vector and the force vector.

Test; Moment Of A Force On A Specified Axis - Question 8

What if the perpendicular distance from the axis is infinity?

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 8

The long distance means a huge force which one needs to apply. Because distance increased will also increase the resistance inertia which will obviously increase the force required for the rotation. Though we know that the larger the distance the small is the force applied for rotation. But inertia must be taken into the considerations some times.

Test; Moment Of A Force On A Specified Axis - Question 9

In the equation A.(rxF) the r is heading from ______________ and ending at _____________

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 9

It is the radius vector. The radius vector is always from the axis of rotation to the point of action of the force on the body. Which means that the radius vector is not on any point on the force vector. Rather it ending at the point on the force vector, where it is being in contact of the body.

Test; Moment Of A Force On A Specified Axis - Question 10

What if the moment of the force calculated about the axis is negative?

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 10

It means that the direction of the motion is in the opposite sense as imagined. We can’t say about the direction of the force or the direction of the radius vector. But yes we can say about the direction of the rotation as it the thing which is going to be calculated. Rest all the parts are fixed. They can’t be altered.

Test; Moment Of A Force On A Specified Axis - Question 11

Determine the moment MQP in the vector form produce by the force as shown in the diagram, which tends to rotate the rod ORQP along QP.

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 11

The use of the formula A.(rxF) gives the answer. In which A is 0.89i + 0.447j m. And the force is 300N, which is being applied at the end of the rod. Thus, after finding the equation of the axis and then replacing it in the equation shown above we get the answer. Actually, the main task is to know the axis equation in the vector form.

Test; Moment Of A Force On A Specified Axis - Question 12

Determine the moment of the force F along the segment QP of the pipe assembly shown in the figure.

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 12

The use of the formula A.(rxF) gives the answer. In which A is 0.6i + 0.8j m and the r is 0.5i + 0.5k. And the force is 300N, which is being applied at the end of the rod. Thus, after finding the equation of the axis and then replacing it in the equation shown above we get the answer. Actually, the main task is to know the axis equation in the vector form. Then get the magnitude of the moment.

Test; Moment Of A Force On A Specified Axis - Question 13

Determine the magnitude of the moment of the force about the axis PQ.

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 13

The use of the formula A.(rxF) gives the answer. In which A is 0.6i + 0.8j m and the r is -0.2k, and the force which is being applied at the end of the rod. Thus, after finding the equation of the axis and then replacing it in the equation shown above we get the answer. Actually, the main task is to know the axis equation in the vector form. Then get the magnitude of the moment.

Test; Moment Of A Force On A Specified Axis - Question 14

Determine the magnitude of the moment of the force about the y-axis.

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 14

The use of the formula A.(rxF) gives the answer. In which A is 1j m and the r is -3i + 4j + 2k and the force which is being applied at the end of the rod. Thus, after finding the equation of the axis and then replacing it in the equation shown above we get the answer. Actually, the main task is to know the axis equation in the vector form. Then get the magnitude of the moment.

Test; Moment Of A Force On A Specified Axis - Question 15

The ___________ forces do not cause the rotation if the rotation is considered in about the axis of the body or the centroid axis of the body.

Detailed Solution for Test; Moment Of A Force On A Specified Axis - Question 15

The concurrent forces are the which are somewhere touching the axis of rotation. If any of the force is touching that axis, that force is not considered, or is insufficient to cause a rotation. If a force is concurrent then the perpendicular distance of the force from the line of axis is zero, thus no rotation. As we know rotation is caused by moment.

24 videos|59 docs|53 tests
Information about Test; Moment Of A Force On A Specified Axis Page
In this test you can find the Exam questions for Test; Moment Of A Force On A Specified Axis solved & explained in the simplest way possible. Besides giving Questions and answers for Test; Moment Of A Force On A Specified Axis, EduRev gives you an ample number of Online tests for practice

Top Courses for Civil Engineering (CE)

24 videos|59 docs|53 tests
Download as PDF

Top Courses for Civil Engineering (CE)