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Test: Moment of A Force - Civil Engineering (CE) MCQ


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25 Questions MCQ Test Engineering Mechanics - Test: Moment of A Force

Test: Moment of A Force for Civil Engineering (CE) 2024 is part of Engineering Mechanics preparation. The Test: Moment of A Force questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Moment of A Force 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 below.
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Test: Moment of A Force - Question 1

Determine the smallest force applied at R which creates the same moment about P as by 75N.

Detailed Solution for Test: Moment of A Force - Question 1

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. We see that the perpendicular distance is 3m. Thus we get the distance. And hence multiply it with the force, the moment = 112.5Nm. Because the force component perpendicular to the distance need to be taken.

Test: Moment of A Force - Question 2

What does the moment of the force measure?

Detailed Solution for Test: Moment of A Force - Question 2

The moment of the force measures the tendency of the rotation of the body along any axis, whether it be the centroid axis of the body, or any of the outside axis. The couple moment is produced by two forces, not by a single force. The total work done is the dot product of force and distance not the cross.

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Test: Moment of A Force - Question 3

If a car is moving forward, what is the direction of the moment of the moment caused by the rotation of the tires?

Detailed Solution for Test: Moment of A Force - Question 3

When you curl your wrist in the direction in which the tires are moving then you will find that the thumb is pointing outwards. That is outwards the body of the car. This phenomena is also observed in rainy seasons. When cars travel on the roads, the water is thrown outside from the tires, due to moment.

Test: Moment of A Force - Question 4

The tendency of rotation of the body along any axis is also called ___________

Detailed Solution for Test: Moment of A Force - Question 4

The tendency of rotation of the body along any axis also called the torque. It is the moment of the force acting perpendicular to the direction of the axis of rotation. If the axis and the force are meeting at any point then there is no moment applied by the force.

Test: Moment of A Force - Question 5

The moment of the force is the product of the force and the perpendicular distance of the axis and the point of action of the force.

Detailed Solution for Test: Moment of A Force - Question 5

The moment is the product of the force applied to the body and the perpendicular distance of the point of action of the force to the axis about which the body is being rotated. That is the moment is the cross product of the force and the distance between the axis and the point of action.

Test: Moment of A Force - Question 6

Determine the moment about the point T.

engineering-mechanics-questions-answers-moment-force-1-q6

Detailed Solution for Test: Moment of A Force - Question 6

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. We see that the perpendicular distance is 0m. Thus we get the distance. And hence multiply it with the force, 0x50.

Test: Moment of A Force - Question 7

The moment axis is in the direction perpendicular to the plane of the force and the distance.

Detailed Solution for Test: Moment of A Force - Question 7

The moment axis is always perpendicular to the planes of the force and the distance of the axis and the point of action of the force on the body. This means that the moment is the cross product of the force and the distance between the axis and the point of action of the force.

Test: Moment of A Force - Question 8

Find the moment along T.

Detailed Solution for Test: Moment of A Force - Question 8

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. But here we have number of forces components acting on the T point. So by adding all the moments caused by all the forces will give us the value as 600Nm.

Test: Moment of A Force - Question 9

If you are getting to know about the direction of the moment caused by the force applied on the body by using your wrist and curling it in the direction of the rotation then which of the following is not right?

Detailed Solution for Test: Moment of A Force - Question 9

The curled hand represents various thing. The direction of the moment axis is given by the thumb. The direction of the force is given by the fingers. As we place the fingers on the force and curl towards the rotational direction of the body about the axis.

Test: Moment of A Force - Question 10

The moment axis, force and the perpendicular distance in the moment of the force calculation is lying in____________

Detailed Solution for Test: Moment of A Force - Question 10

The moment axis, force and the perpendicular distance is lying in the three dimensional Cartesian. It doesn’t lye on the single plane. It also doesn’t lye in a single line. Nor in the direction of the force. Thus they all lye in the planes which are perpendicular to each other.

Test: Moment of A Force - Question 11

If the rotation is clockwise in this page, suppose, then in which direction will the thumb project if you curl your hand in the same direction of the rotation?

Detailed Solution for Test: Moment of A Force - Question 11

As the curling will give the direction perpendicular to the paper. But it does depend upon the rotation sense. In this example, the sense is clockwise. Thus the thumb goes into the paper. That is it goes away from the viewer. Thus the answer.

Test: Moment of A Force - Question 12

Which of the following is true?

Detailed Solution for Test: Moment of A Force - Question 12

The moment is the vector quantity. Thus the value of the total moment caused by various forces acting on the body is the vector sum of all the vectors. Also the moments are not perpendicular to each other, unless it is specified. Thus assumptions cant be taken for the direction of the moment.

Test: Moment of A Force - Question 13

Determine the moment about the point R.

Detailed Solution for Test: Moment of A Force - Question 13

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. We see that the perpendicular distance is 7m. Thus we get the distance. And hence multiply it with the force, 7×50

= 350 Nm.

Test: Moment of A Force - Question 14

Find the moment along Q.

Detailed Solution for Test: Moment of A Force - Question 14

Soln .5M SDON SOOCOS 3 D Moment along T Mq: spower 2 soarine 2300X2 =1600NM 1.514 Tzu R 2m + 20 tane 12 Moment, along a t/m a

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. But here we have a number of forces components acting on the T point. So by adding all the moments caused by all the forces will give us the value as 600Nm.

Test: Moment of A Force - Question 15

Determine the moment of the force along point P.

Detailed Solution for Test: Moment of A Force - Question 15

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. We see that the perpendicular distance is 1.5 (3cos60). Thus we get the distance. And hence multiply it with the force, 75×1.5. Because the force component perpendicular to the distance need to be taken.

Test: Moment of A Force - Question 16

Find the moment of the force about the point R.

Detailed Solution for Test: Moment of A Force - Question 16

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. We see that the perpendicular distance is 5m. Thus we get the distance. And hence multiply it with the force, 5x2000xsin30. Because the force component perpendicular to the distance need to be taken.

Test: Moment of A Force - Question 17

How far from the shaft at P a 200N vertical force must act so as to create the same moment as produced by the 75N, at P?

Detailed Solution for Test: Moment of A Force - Question 17

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. So let the distance be y, then the force of 200N will act downward. The distance perpendicular is xcos60. Thus equating the 112.5 to 200ycos60.

Test: Moment of A Force - Question 18

Find the moment along the point at the mid of the line SR.

Detailed Solution for Test: Moment of A Force - Question 18

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. But here we have number of forces components acting on the T point. So by adding all the moments caused by all the forces will give us the value as 600Nm.

Test: Moment of A Force - Question 19

Which of the following is true?

Detailed Solution for Test: Moment of A Force - Question 19

We can take such assumptions. We are free to do so. We just need to specify if clockwise is positive then the counter clockwise is to be negative. Also such assumption are very useful in 2D calculation of the moments caused by various forces on the body.

Test: Moment of A Force - Question 20

The moment is the cross product of which two vectors?

Detailed Solution for Test: Moment of A Force - Question 20

The cross product needs to take in the proper sequence. If not taken then the answer is just the opposite of the true answer. That’s why, the answer is not the Force and Radius vectors, but the Radius and Force vectors. Because the moment has its direction, as many of the cross products have, and thus precaution needs to be taken.

Test: Moment of A Force - Question 21

The ___________ forces do not cause the rotation.

Detailed Solution for Test: Moment of A Force - Question 21

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.

Test: Moment of A Force - Question 22

Choose the correct one.

Detailed Solution for Test: Moment of A Force - Question 22

The coplanar system means the consideration is with the 2D only. No 3D. Thus if there is any moment needed to be considered we need to take it along the point and not along the axis. But talking about the axis, there might be no axis in the 2D, as it is only in the 3D.

Test: Moment of A Force - Question 23

Determine the moment about the point S.

Detailed Solution for Test: Moment of A Force - Question 23

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. We see that the perpendicular distance is 2m. Thus we get the distance. And hence multiply it with the force, 2×50.

= 100Nm

Test: Moment of A Force - Question 24

Moments can be added like scalars that is it can be added algebraically with proper signs.

Detailed Solution for Test: Moment of A Force - Question 24

The moments in the 2D can be added algebraically just like the scalar quantities. But the need is that the signs must be taken into the consideration. As if clockwise is positive, so anti clockwise is negative. And the result can be negative too. That is counter clockwise direction.

Test: Moment of A Force - Question 25

If you are opening the door, then the force you apply is greater if you open it from the part closer to the hinges.

Detailed Solution for Test: Moment of A Force - Question 25

As the moment is the product of the force and the perpendicular distance of the point of action and the axis, thus more the distance more will be the moment. And hence to overcome that you have to apply more energy. Thus the answer.

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