4th TSSA Part A Unit 1 Exam Questions and Answers

4th TSSA Part A Unit 1 Exam Questions and Answers (4-009-2.3) The ability of a body to do work due to its motion is called ____________ energy. - Answer-Kinetic (4-009-1.7) The change of position (in meters) per unit time is: - Answer-Velocity (4-015-1.5) The force of friction is: - Answer-Not affected by the area of the two surfaces in contact. (4-012-1.11) With reference to scalars and vectors, a space diagram: - AnswerIllustrates a system of vectors. (4-016-3.3) A 1.5m long round bar is 45mm diameter and stretches 1.2mm under a load of 240kN. Calculate the strain in the bar. - Answer-0.0008 (4-015-2.7) Find the force required to move a 25kg block along a horizontal floor if the coefficient of sliding friction is 0.19. - Answer-46.6 N (4-013-1.1) Velocity is a/an ___________ quantity. - Answer-Vector (4-010-2.8) A 5m long bar is pivoted on the right end and a force of 10N is applied upwards on the left end. The moment of force is: - Answer-50Nm clockwise (4-016-2.8) External tensile forces acting parallel but not in line produce _________ in an object. - Answer-Shear stress (4-017-2.2) A 28-tooth gear turns at 100 rpm and drives a 112-tooth gear. What is the speed of the follower gear? - Answer-25 rpm (4-009-2.8) The ability of a body to do work by virtue of its position is the body's ___________ energy. - Answer-Potential (4-017-1.2) The tensions in the tight and slack sides of a belt drive are 14000N and 900N respectively. If the power transmitted is 655kW, what is the speed of the belt, if there is no slippage? - Answer-50 m/s (4-009-1.4) The mass of an object may be measured in: - Answer-kg (4-016-2.7) The _______ is the maximum stress value that a material can be subjected to and still return to its original size and shape when the deforming load is removed. - Answer-Elastic limit (4-016-2.4) The ratio between the ultimate strength and the allowable stress is called the: - Answer-Safety factor (4-013-3.5) An object is dropped from a height of 45m. What will be its velocity immediately before it hits the ground? - Answer-29.71 m/s (4-013-2.3) An airplane travels 500km due west in 2 hours. Its average velocity was: - Answer-69.4 m/s due west (4-012-1.8) Which of the following is NOT a scalar quantity? - Answer-Velocity (4-017-1.5) In a belt drive system, the input to the driver pulley is 265kW and the output is 211kW. What is the efficiency? - Answer-79.60% (4-017-1.6) In a belt drive system, if the driver is smaller than the follower the: - AnswerFollower will turn slower than the driver.