M. Adithan - Machine Methods

Choose the correct alternative: In isometric projection, two of the axes are: (a)15 degrees with the horizontal (b)30 degrees with the horizontal (c)60 degrees with the horizontal (d)120 degrees with the horizontal The device most often used in measuring cross-sectional areas shown on an engineering drawing is a: (a)Pantograph (b)French curve (c)Geodimeter (d)Planimeter For a sphere: (a)any section will be an ellipse (b)auxiliary views are necessary to fully describe the figure (c)a bottom view will be necessary to adequately represent the object (d)all views of the object are similar The system of presenting views of an object generally used in engineering drafting is: (a)Trimetric projection (b)Oblique projection (c)Isometric projection (d)Orthographic projection Of the following items, the one that is least likely to be found in the title block of an engineering drawing is the: (a)number of hours required to make the drawing (b)name of the designer (c)scale of the drawing (d)date of completion of the drawing On a drawing of an object, the heaviest lines would usually be: (a)invisible lines (b)main dimension lines (c)the outline (d)the centerlines If the front and top views of a solid object are circles of the same diameter, then the object would be a: (a)Torus (b)Ellipsoid (c)Parallelopiped (d)Sphere A pictorial drawing, two of the axes of which are 30 degrees with the horizontal, is known as: (a)a diametric drawing (b)an isometric drawing (c)a perspective drawing (d)an oblique drawing In the part drawing of a component, the symbol refers to the: (a)class of fit (b)finish on that surface (c)type of knurl to be machined on that surface (d)class of steel to be used for the component. A detailed drawing of component from which the component is fabricated is known as a: (a)perspective drawing (b)contour drawing (c)trilinear drawing (d)shop drawing The name of the instrument used to find the areas of irregular shapes is: (a)Planimeter (b)Micrometer (c)Perthometer (e)Indicator (d)Vernier caliper An instrument consisting of four jointed pins forming a parallelogram used for copying drawings or maps to any desired scale is called a: (a)Proportional divider (b)Beam compass (c)Planimeter (d)Pantograph On a drawing showing front, rear, and side elevations and plan, the projected views are most likely to be: (a)isogonic (b)orthographic (c)isographic (d)isometric Of the following, the most important reason for checking an engineering drawing is to: (a)check accuracy of the scaling (b)eliminate unnecessary sections (c)rectify the errors or mistakes (d)check for the time taken to complete the drawing An approved method of obtaining the area of an irregular figure is by means of a: (a)Slide caliper (b)Micrometer (c)Planimeter (d)Pantograph On the part drawings of components which require machining, the symbol denotes: (a)type of steel to be used for the component (b)finish required on that surface (c)class of fit (d)tolerance value on the dimension (e)welding is to be done On a production drawing, the details of a Metric thread are specified as: M20 1.0. In this 1.0 represents: (a)the depth of the thread in mm (b)the pitch of the thread in mm (c)the diameter of the wire (in mm) used to measure the thread characteristics (d)the diameter of the thread, in mm Surface roughness on a drawing is represented by: (a)Triangle (b)Rectangle (c)Square (d)Parallelogram RMS value stands for: (a)Root minimum square value (b)Root mean square value (c)Root maximum square value CLA value is used to represent: (a)Surface dimensions (b)Surface hardness (c)Surface roughness. 1. Answer Key (b) (d) (d) (d) (a) (c) (d) (b) (b) (d) (a) (d) (b) (c) (c) (b) (b) (a) (b) (c) Choose the correct alternative: The hydrostatic pressure in a 60 cm diameter ductile iron water main is 5 kg/ cm. If the thickness of the pipe is 12.5 mm, then the tension in the pipe material due to the hydrostatic pressure, is most nearly equal to: (a)30 kg/ cm (b)60 kg/ cm (c)90 kg/ cm (d)120 kg/ cm (e)5 kg/ cm only The compressibility of a substance may be found from: (a)the modulus of elasticity (E) (b)the reciprocal of the modulus of elasticity (c)the bulk modulus of elasticity (K) (d)the reciprocal of the bulk modulus of elasticity (e)the Poissons modulus Within the elastic limit the ratio as defined by Unit lateral contraction is called: Unit axial elongation (a)the modulus of elasticity (E) (b)the modulus of rigidity (N) (c)Poissons ratio (d)Youngs modulus (e)an imaginary ratio In a 6 20 wire rope, the No.6 indicates the: (a)diameter of the wire rope in mm (b)number of strands (c)number of wires (d)gauge number of the wire A spring has a constant of 5 kg/cm.

The total energy required to elongate it through a distance of 6 cm is: (a)30 kg. cm (b)180 kg. cm (c)360 kg. cm (e)150 kg. cm (d)90 kg. cm Sleeves are used around anchor bolts that connect steel columns to footings primarily to: (a)allow for minor lateral adjustments of anchor bolts (b)provide better bearing of base plate on the footing (c)provide greater bond between anchor bolt and footing (d)allow the proper setting of the column as to elevation A round rod with a right handed thread is to be coupled with another rod of the same diameter but with a left handed thread.

Of the following attachments, the one which is most appropriate to use is a/an: (a)Turnbuckle (b)Thimble (c)wing nut (d)eyebolt A spring with a uniform scale of 120 kg/cm of compression has a force of 600 kg applied to it. The work done on the spring is: (a)3000 kg. cm (b)6000 kg. cm (c)1500 kg. cm (d)72,000 kg. cm A 100 kg block resting on a horizontal plane has a static coefficient of friction of 0.30 and is acted on by a horizontal force of 20 kg.

Frictional resistance under the above conditions is: (a)20 kg (b)30 kg (c)50 kg (d)10 kg (e)100 kg A flywheel is used on rotating machinery to: (a)allow rapid acceleration (b)store and release energy as required (c)decrease the weight of the equipment (d)balance the rotating parts Steel columns are tied to concrete foundations by: (a)grouting (b)anchor bolts (c)cement paste (d)gunite A C.H.U ( Centigrade-Heat-Unit ) is an unit of: (a)force (b)energy (c)power (d)temperature If two objects are weighed in plant Mercury and it is found that they both lose the same weight, then the two objects must have identical: (a)specific gravities (b)weights in air (c)volumes (d)densities (e)weights in Mercury The law of conservation of momentum states that: Ithe linear momentum of the system remains constant IIthe angular momentum of the system remains constant IIIthe sum of the linear and angular momenta of the system remain constant Which of the above statement (s) is/are true? (a)Only I (b)Only II (c)Only III (d)Only I and II (e)All three statements are correct An anchor block at a bend in a pipe line must be designed primarily to resist forces due to: (a)friction and acceleration (b)friction and pressure (c)pressure and acceleration due to gravity (d)static head (e)pressure and velocity A pilot in an airplane observes that objects in the cabin are just floating when he is at the top of a loop. The radius of curvature of the loop is 100 meters. The speed of the plane is closest to: (a)32 meters/sec (b)64 meters/sec (c)320 meters/sec (d)640 meters/sec (e)none of these Two bodies of identical shape are dropped from a helicopter. If the density of the two bodies is not the same then: (a)because of Stokes law they will achieve the same terminal velocity and reach the ground at the same time (b)the less dense one will arrive first (c)the more dense one will arrive first (d)it is not possible to predict which will arrive first (e)they will become attracted to each other and arrive at the same time If you double the speed of a centrifugal pump, Itwice as much power is required to operate it IIthe volumetric discharge is increased 4 times IIIthe head becomes 4 times as great Which of the above statement(s) is/are true? (a)all of the above statements are true (b)only II and III (d)only I (c)only III (e)only II In a loaded horizontal, homogenous rectangular beam, the horizontal shearing stress at any cross-section perpendicular to the neutral axis (a)has a maximum value at the outer fibers of the beam (b)is equal to zero (c)has a maximum value at the neutral axis and is equal to 1.5 times the average shearing stress at that section (d)is constant across that section (e)equals 2/3 the bending stress at the outer fibers Which of the following is true concerning St. Venants Principle? (a)Deformations of all materials must be equal (b)It is a method for determining the stress conditions at the end of the plates (c)Stress conditions approach uniformity as the distance from the point of application of the force increases (d)If left long enough, the stresses will tend to relieve themselves Under atmospheric conditions, the maximum height through which a fluid of specific gravity x may be siphoned is: (a) x /10 meters (b)(1 x )/10 meters (c)10/(1 x ) meters (d)10/ x meters (e)(1 + x )/10 meters What unbalanced torque will produce an angular acceleration of 2 rad/sec in a 120-kg disc having a radius of gyration of 2 meters? (a)960 m-kg (b)240 m-kg (c)48 m-kg (d)96 m-kg (e)480 m-kg If a longitudinal wave of frequency 1000 vibrations per second has a wave length of 10 meters, its speed of propagation is: (a)100 meters/second (b)2500 meters/second (c)5000 meters/second (d)10,000 meters/second (e)20,000 meters/second An impulse is a product of: (a)force and displacement (b)force and velocity (c)mass and velocity (d)force and time (e)mass and acceleration A model airplane is made to an exact scale of 1/6 that of the prototype aircraft. (a)Twice (b)One-half (c)One-sixth (d)Six times (e)Thirty-six times A Newton is the force required to give: (a)one kg mass an acceleration of 1 meter/ sec (b)one kg mass a velocity of 1 meter/sec (c)one kg mass a velocity of 1 cm/sec (d)one kg mass an acceleration of 10 meters/ sec If a power screw is being turned at 10 R.P.M. by a constant applied torque of 50 kg-cm, then the work done in one revolution is most nearly equal tokg-cm. (a)25 (d)150 (c)100 (b)50 (e)200 A lift cable will have its greatest tension when the lift cabin is moving: (a)down and is coming to rest (b)upward at a constant speed (c)upward and is coming to rest (d)downward at a constant speed (e)when it is at rest The frequency of a vibrating string is: (a)inversely proportional to the square of the length (b)directly proportional to the square of the tension (c)inversely proportional to the square root of the mass per unit length (d)inversely proportional to the diameter of the string (e)directly proportional to the square root of the tension and inversely proportional to the mass per unit length In a system consisting of any number of concurrent, coplanar forces, the equilibrant consists of: (a)a couple (b)a single force (c)a single force plus a couple (d)all of the above (e)none of the above A body moves from rest with a constant acceleration of 5 meters/sec. (a)25 (d)150 (c)100 (b)50 (e)200 A lift cable will have its greatest tension when the lift cabin is moving: (a)down and is coming to rest (b)upward at a constant speed (c)upward and is coming to rest (d)downward at a constant speed (e)when it is at rest The frequency of a vibrating string is: (a)inversely proportional to the square of the length (b)directly proportional to the square of the tension (c)inversely proportional to the square root of the mass per unit length (d)inversely proportional to the diameter of the string (e)directly proportional to the square root of the tension and inversely proportional to the mass per unit length In a system consisting of any number of concurrent, coplanar forces, the equilibrant consists of: (a)a couple (b)a single force (c)a single force plus a couple (d)all of the above (e)none of the above A body moves from rest with a constant acceleration of 5 meters/sec.