General Mechanical Engineering MCQs

1. What aspect of machine virabtion is described in cycles per second?

2. Creep is the tendency of a solid to:

3. As related to steam production, what do the letters BHP stand for?

4. Which fan configuration is designed to add energy to airflow passing straight through the fan blades?

5. What must happen to fuel oil at the burner for efficient combustion?

6. What is the term for the ability of a material to withstand the force of being pulled apart?

7. What is a term for heat transfer between two objects in contact, driven by a constant temperature difference?

8. The reduction in effectiveness of a vehicular brake is called:

9. Which of these processes involves melting the workpieces?

10. What is the lowest stress that produces a permanent deformation in a material?

11. Which machine tool rotates the workpiece on its axis?

12. Which fieldlines are instantaneously tangent to the velocity vector of flow?

13. What describes the effect of a material expanding in the directions perpendicular to its direction of compression?

14. What is the density of water?

15. What is an upward force exerted by a fluid that opposes the weight of an immersed object?

16. Why are fan assemblies usually designed with spring isolators?

17. True or False: Vapour compression used in most household refrigerators is a non-cyclic process.

18. How is the heat energy that changes the state of an object but not its temperature described?

19. What does ASME stand for?

20. What is the rotational force exerted by a spinning shaft?

21. Which device is used to store rotational energy?

22. Which if these is NOT a component of aerodynamic force?

23. What is the measure of a fluid's resistance to gradual deformation by shear stress or tensile stress?

24. What are the units for Reynold's number?

25. What is defined as the ratio of tensile stress to tensile strain?

26. Which value must be calculated into piping system designs?

27. What is the result of continous cyclic loads on a metal object?

28. The set of equations used to describe motion?

29. True or False: Silicon can be used to make microelectromechanical systems.

30. True or False: A perfect Carnot heat engine cannot be built in reality.

31. Newton's law of cooling states that the rate of heat loss of a body is proportional to:

32. Which of these manufacturing processes involves pouring liquid metal into a mould?

33. Total mechanical energy is the sum of what two forms of energy?

34. True or False: All matter with a temperature greater than absolute zero emits thermal radiation.

35. How do we describe the property of an object or material which will restore it to its original shape after distortion?

36. What are the three basic methods of heat tranfser?

37. What term describes the calculations related to objects with greater than zero velocity?

38. What is a tool used for stamping metal by a press?

39. What is one advantage of multi-stage centrifugal pump configurations over single-stage centrifugal pump configurations?

40. Which of these is a turbine for hydro power?

41. Which type of gear meshing should be employed to transmit torque to a linear force?

42. How many degrees of freedom does a rigid body have in three dimensional space?

43. Which mechanism can convert rotational motion to reciprocating motion?

44. What is the simple mechanics description of a force acting upon an object to cause a displacement of the object?

45. Which stress acts in parallell with the cross section of a material?

46. What is the unit of measurement defined as "the amount of heat needed to raise 1 pound of water 1 degree"?

47. What is constant in an isochoric process?

48. Which of these factors least affects the heat dissipation by a heat sink?

49. Which term is used to describe the angle of the cutting face relative to the cutting work?

50. What type of deformation may take place when large amounts of tensile strain are localized in a small area of a material?

51. Which chemical can be added to a closed loop system to prevent freezing?

52. What is the purpose of simple machines such as pulleys and levers?

53. What force describes the principle of Newton's second Law of Motion that objects naturally resist changes to their course of motion?

54. What is the function of a feeler gauge?

55. When a material is compressed in one direction, it tends to expand in the other two directions perpendicular to the direction of compression. What is this effect called?

56. What is another name for a gear traing's torque ratio?

57. Which of these is NOT a state function?

58. What can be done to increase the capacity of a plate frame heat exchanger?

59. What kind of an engine does an Otto cycle describe?

60. What is designed into gear sets to provide the proper amount of teeth clearance to avoid binding?

61. Which is the most common stress used to evaluate the yielding of ductile materials?

62. What is the term for the cutting process where the tool and cutting surface are perpendicular to each other?

63. Which of these is a method used to evaluate new product ideas?

64. Place these in the correct order for torsion: T,L,J,theta

65. Approximately how much does one gallon of water weigh?

66. What is the maximum allowable working pressure for a low pressure steam boiler?

67. How do we describe the process for determining the magnitudes of the components of a vector directed in two dimensions?

68. Which law of thermodynamics captures the idea that higher temperature materials will always gravitate toward cooler temperatures?

69. What is the force that prevents a material from being torn apart?

70. According to Newton's first law, if the vector sum of all forces acting on a body is zero, then its:

71. What is the name of the 3 valve configuration designed to continuously vent unwanted fuel away from it's point of use?

72. What are the units for a moment of inertia?

73. True or False: The force needed to extend a spring by a certain distance is inversely proportional to that distance.

74. According to Bernoulli's principle, what happens in an ideal fluid with a decrease in pressure?

75. What quality should shock resisting steel posses?

76. Cooling tons are calculated as the amount of heat energy needed to turn one ton of ice into water over what time period?

77. What two fuel types are commonly incorporated into dual fuel burner design?

78. What machinability rating has the American Iron and Steel Institute (AISI) given to AISI No. 1112 carbon steel?

79. What type of fuel oil pump will deliver consistent pressure and volume with minimal fluctuations to combustion eqiupment?

80. A four bar linkage system meets the Grashof condition if:

81. In a heat exchanger application, what value does the term "temperature delta" refer to?

82. Cogeneration commonly combines the production of what two forms of energy?

83. A Mohr's circle reduces to a point when the body is subjected to which of the following conditions?

84. Doubling the thickness of a rectangular cantilever beam will do what to the stiffness?

85. Water can be raised in temperature by means of what type of energy?

86. In relation to O-Ring sealing, what are back up seals.

87. What is the ratio of the molar volume of a gas to the molar volume of an ideal gas at the same temperature and pressure?

88. Which thermodynamic cycle is ideally isobaric?

89. For a completely isolated system, what is the entropy at thermodynamic equilibrium?

90. When dimensioning drawings with Inches which of these is the correct format?

91. What is the term for the horizontal portion of a chimney draft system extending from combustion equipment?

92. What is the SI unit for thermal resistance?

93. What is the static head pressure of a column of water 2 ft high?

94. For a machine resting on four legs, how do you describe the leg not carrying equal weight to the other three?

95. What type of loading is applied to a coil spring in compression?

96. What is the function of unloaders in a reciprocating compressors design?

97. Which of these is NOT a type of truss?

98. Which of these is a method for visualizing and analyzing fluid flow?

99. What are the axes in Mohr's circle diagram?

100. Which is also known as croning process in which cast parts are produced with dimensional tolerances as low as ±0.2 millimeters.

101. Calculate the moment of a 20 newtons force at 10 meters perpendicular distance from the point about which the moment is required.

102. Which devices is used for atomizing and vaporizing the fuel before mixing it with air in varying proportions?

103. Which branch of engineering mechanics deals with the force which acts upon bodies at rest?

104. Calculate the centrifugal force for a body moving in a circular path, given that the mass of the body is 10 kilogram, its angular velocity is 10 radians per second and the radius of the circular path is 10 meters.

105. Which is the correct range of value for the included angle of a V-belt?

106. Which is a spring controlled governor?

107. Which plant layout is known as 'functional layout' or 'analytical layout'?

108. Which types of chips is usually produced during the machining of brittle materials?

109. According to the Boyle's law:

110.

Calculate the specific heat of a gas at constant volume, given that the mass of the gas is 100 kilograms, the initial temperature of the gas is 20 kelvins and the final

 temperature of the gas is 50 kelvins. The total heat supplied to the gas is 105 kilojoules.

111. The compression ratio of a diesel engine is:

112. The petrol engine works on ___________.

113. In which, systems, does no heat or work cross its boundary?

114. A couple of two bodies produces which type of motion?

115. Up to which point in a stress-strain curve is Hooke's law applicable?

116.

A solar collector receiving solar radiation at the rate of 0.6 kW/m2 transforms it into the internal energy of a fluid at an overall efficiency of 50%. The fluid heated to 350 K is used to run a heat engine which rejects heat at 313 K. If the heat engine is to deliver 2.5 kW power, the minimum area (in sq. meters) of the solar collector required would be:

117. In which type of welding is a mixture of Iron oxide and Aluminum used?

118. The forces which meet at one point but whose lines of action lie on different points are known as ______________.

119.

Calculate the value of crippling load of a specimen, given that the crushing stress is 160 newtons per square meter, cross sectional area is 80 square millimeters, Rankine's

constant is 1, length of column is 1 millimeter and the value of radius of gyration is also 1.

120. How many revolutions of crankshaft does it take to complete one working cycle in a four stroke engine?

121. Which type of thread is used in bench vices in manufacturing units?

122. In which, governing methods, is a control valve fitted in the fuel delivery pipe in order to control the quantity of fuel mixed in the charge?

123. In which wage incentive plans is the worker paid according to the number of units of work produced by him?

124. In which, engine strokes, is the firing of the vaporized fuel carried out?

125. The process to improve the fatigue resistance in metals by producing compressive stresses in its surface is known as ________.

126. Due to which properties does molding sand adhere to the sides of the molding box?

127. Calculate the number of joints in a chain if the number of links is 5.

128. Calculate the strain in a material whose original length before undergoing strain is 10 centimeters and the length after undergoing strain is 100 centimeters.

129. In which, scavenging methods, are the inlet and the outlet ports situated on the same side of the engine cylinder?

130. The resultant of two forces A and B is Q. If A is doubled and the new resultant is perpendicular to A, then:

131. Calculate the mechanical efficiency of an engine whose brake power is 20 watts and indicated power is 40 watts.

132. ___________ is an opening through the cope.

133. If the motion between a pair takes place in more than one direction, then this kind of motion is termed as ___________.

134. The work measurement technique is concerned with:

135. What is the value of universal gas constant in SI units?

136. A process in which gas is heated such that the product of its pressure and volume remains constant is known as

137. Which type of welding is obtained if there is an excess of acetylene?

138. In a simple harmonic motion, number of cycles produced per second is known as:

139. Calculate the frictional power of an engine if the indicated power is 10 watts and the brake power is 5 watts.

140. The allowance provided on patterns which are used for castings in which contraction is not uniform is known as _________.

141. If we have to choose a grinding wheel having the least hardness, which grade of grinding wheel should be chosen?

142. Calculate the torque for a solid shaft having a radius of 10 millimeters and torsional shear stress of 112 newtons per square millimeter.

143. _____________ is the operation of enlarging a previously drilled hole.

144. Two springs having stiffness 5 and 10 respectively are connected in series. Calculate the combined stiffness of the two springs.

145. What is the value of entropy of a substance at absolute zero temperature?

146. If M - bending moment, I - moment of inertia, E - young's modulus of elasticity and R - radius of curvature then, which is the correct bending equation for a beam?

147. The milling operation of producing surfaces of irregular shape is known as:

148. What effect does the grain size of a cutting tool have on the tool life?

149. Within which angular range is the shear stress maximum if a body is subjected to tensile stress in one plane?

150. _______________ is a beam having its end portion extended beyond the support.

151. ___________ is that type of motion in which there is reduction in amplitude over every cycle of vibration.

152. Calculate the circular pitch of a gear whose pitch circle diameter is 12.74 millimeters and the number of teeths on gear wheel are 20.

153. The shortest time in which an activity can be completed is known as:

154. Which type of organization among the following has a straight flow of authority within a single unit?

155. The smallest circle drawn to the cam profile is known as ________.

156. Calculate the coefficient of friction of a body whose limiting friction of which is 10 newtons and the value of the normal reaction is 5.

157. In a programmed evaluation and review technique, if the slack of an activity is negative, then what can be stated for the project completion?

158. __________ is the angle made by the face of the tool and the parallel plane to the base of the cutting tool.

159. What type of gear is used to transmit power at constant velocity ratio between two shafts the axes of which intersect at an angle?

160. Which technique is known as 'time phase of loading'.

161. The process of heating the metal to the plastic state followed by application of pressure to form the molten metal into desired shape is known as ________.

162. The radius of a shaft is 5 millimeters. The shear stress on that shaft is 50 newtons per square millimeter and the polar moment of inertia is 10 (millimeters)4. Calculate the twisting moment on that shaft.

163. If L is the length of the journal and d is the diameter of the journal then, in a square bearing:

164. The bolt and nut is an example of a:

165. In involute gears the pressure angle __________ as the gear engages or disengages.

166. The broaching operation in which the workpiece moves across the stationary tool is known as _______.

167. Calculate the coefficient of friction of a body whose limiting friction is 10 newtons and the value of the normal reaction is 5.

168. The ability of a material to embed small particles of dust, grit etc. is known as ___________.

169. A jig is a device which is used to:

170. What is the value of the point angle of a twist drill?

171.

Calculate the economic order quantity of a plant in which the total raw material utilized per year is 1600 tonnes,

procurement cost per order is $1000 and the annual inventory carrying cost per item is $10.

172. Which is not a characteristic of rolling contact bearing?

173. Calculate the angular velocity of a body whose rotations per minute is 60.

174. What is the ratio of the lateral strain to the linear strain called?

175. The Scotch yoke mechanism and Oldham's coupling is an example of:

176. In relation to standard sizes of leaf spring, which option is the correct width used in the design of leaf springs?

177. What is the value of the standard molar enthalpies of formation at 298K of NaCl(s)?

178. In relation to mechanics of materials, which option correctly defines a stress?

179. What is the amount of heat absorbed if two litres of an ideal gas at a pressure of 10 atm expands isothermally into a vacuum until its total volume becomes 10 liters?

180. Consider a circular hollow tube made of steel which is used for supporting a compressive load of 600 kN. The inner diameter of the tube is 90 mm and the outer diameter is 130 mm. What is the compressive stress, if the length of the tube is 1000 mm?

181. In relation to bending stress, what is the correct value of bending or flexural modulus (Eb), if P is the normal force, L is the beam length, w is the beam width, t is the beam thickness, and y is the deflection at load point?

182. Which option can be exchanged in a closed system?

183. Express the change in internal energy of the system when no work is done on the system but a certain amount of heat, say q, is taken out from the system and given to the surroundings.

184. Consider the two timber posts that measure 150 millimeters square and 4 meters high. These posts are subjected to an axial load of 108 kN each. How much will they be shorten because of the load, if one post is made of pine timber (E = 7800 MPa)and the other of Australian blackwood (E = 15300 MPa)?

185. Which option is the correct characteristics of the oil-tempered wire?

186. What is the significance of the above given symbol in work study technique?

187. The production manager is responsible for all of the following except ________.

188. The shear stress is a maximum where the velocity is __________.

189. ________ involves the use of computers to direct manufacturing processes.

190. A stone submerged in water displaces the _________.

191. A shorter electromagnetic wave is _____.

192. When referring to flexible manufacturing, it is true that it ________.

193. The goal achieved by using mass production is to ________.

194. The main goal of utilizing a mass customization production system is to ________.

195. Enterprise resource planning (erp) takes mrp one step further because it ________.

196. Prior to the implementation of total quality management, defective items were ________.

197. In __________, materials are physically or chemically changed to produce a product.

198. The flow rate of a liquid is _______.

199. In manufacturing, a(n) __________ is used to produce large quantities of a few types of products.

200. Primary controls include the gearshift lever, steering wheel, and _______________.