Recent questions and answers in Mechanical Engineering

Description : Air is normally dehumidified by : (A) injecting water (B) passing steam (C) heating (D) cooling

Last Answer : 1

Description : The most suitable refrigerant for a commercial ice plant is : (A) brine (B) NH3 (C) Freon (D) air

Last Answer : Ammonia NH3

Description : Two metallic blocks having masses in the ratio 2:3 are made to slide down a frictionless inclined plane starting from rest position. When the blocks reach the bottom of the inclined plane, they will have their kinetic energies in the ratio : (A) 2:3 (B) 3:5 (C) 3:2 (D) 7:4

Last Answer : Two metallic blocks having masses in the ratio 2:3 are made to slide down a frictionless inclined plane starting from rest position. When the blocks reach the bottom of the inclined plane, they will have their kinetic energies in the ratio : 2:3

Description : The train value of a gear train is : (A) equal to velocity ratio (B) reciprocal of velocity ratio (C) always greater than unity (D) none of the above

Last Answer : The train value of a gear train is : reciprocal of velocity ratio

Description : If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then the energy stored in the latter at the same speed will be : ... at the first one (C) One fourth of the first one (D) One and half times the first one

Last Answer : If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then the energy stored in the latter at the same speed will be : One fourth of the first one

Description : Material having highest cutting speed is : (A) Cast iron (B) Bronze (C) Aluminium (D) High carbon steel

Last Answer : Material having highest cutting speed is : Aluminium

Description : Angle between the shear plane and work surface is known as : (A) lip angle (B) rake angle (C) cutting angle (D) shear angle

Last Answer : Angle between the shear plane and work surface is known as : shear angle

Description : Binding material used in cemented carbide tools is : (A) Nickel (B) Cobalt (C) Chromium (D) Silicon

Last Answer : Binding material used in cemented carbide tools is : Cobalt 

Description : The usual ratio of forward and return stroke in shaper is : (A) 2:1 (B) 1:2 (C) 2:3 (D) 3:2

Last Answer : The usual ratio of forward and return stroke in shaper is :  3:2

Description : Tool life is most affected by : (A) cutting speed (B) tool geometry (C) feed and depth (D) microstructure of material being cut

Last Answer : Tool life is most affected by : cutting speed 

Description : The main object of scientific layout is : (A) to produce better quality of product (B) to utilise maximum floor area (C) to minimise production delays (D) all of these

Last Answer : The main object of scientific layout is : (A) to produce better quality of product (B) to utilise maximum floor area (C) to minimise production delays (D) all of these

Description : In value engineering, the term value refers to : (A) manufacturing cost of the product (B) selling price of the product (C) total cost of the product (D) utility of the product

Last Answer : In value engineering, the term value refers to : utility of the product

Description :  In axial flow fans and turbines, fluid enters and leaves as follows : (A) radially, axially (B) axially, radially (C) axially, axially (D) radially, radially

Last Answer : In axial flow fans and turbines, fluid enters and leaves as follows : (A) radially, axially (B) axially, radially (C) axially, axially (D) radially, radially

Description :  A twist drill is a : (A) side cutting tool (B) front cutting tool (C) end cutting tool (D) none of these

Last Answer :  A twist drill is a : end cutting tool 

Description : In inventory control theory, the economic order quantity is : (A) average level of inventory (B) optimum lot size (C) capacity of a warehouse (D) lost size corresponding to break-even analysis

Last Answer : In inventory control theory, the economic order quantity is : optimum lot size 

Description : Production cost refers to prime cost plus : (A) factory overheads (B) factory and administration overheads (C) factory, administration and sales overheads (D) factory, administration, sales overheads and profit

Last Answer : Production cost refers to prime cost plus : factory overheads

Description : Power transmitted through a pipe is maximum when the loss of head due to friction is : (A) one-half of the total head supplied (B) one-third of the total head supplied (C) one-fourth of the total head supplied (D) zero

Last Answer : Power transmitted through a pipe is maximum when the loss of head due to friction is : one-third of the total head supplied 

Description : The efficiency of a centrifugal pump is maximum when its blades are : (A) straight (B) bent forward (C) bent backward (D) bent forward first and then backward

Last Answer : The efficiency of a centrifugal pump is maximum when its blades are : bent backward

Description : The comfort conditions in air conditioning are : (A) 22 ºC dry bulb temperature and 60% relative humidity (B) 25 ºC dry bulb temperature and 100% relative humidity (C) 20º C dry bulb temperature and 75% relative humidity (D) 15º C bulb temperature and 80% relative humidity

Last Answer : The comfort conditions in air conditioning are : 22 ºC dry bulb temperature and 60% relative humidity 

Description : Dew point temperature is constant as long as there is : (A) no change in moisture content of the air (B) no change in volume of air (C) no change in dry bulb and wet bulb temperature (D) no change in relative and specific humidity of air

Last Answer : Dew point temperature is constant as long as there is : no change in moisture content of the air

Description : Gantt chart is used for : (A) inventory control (B) material handling (C) production schedule (D) machine repair schedules

Last Answer : Gantt chart is used for :  production schedule

Description : The ratio of maximum displacement of the forced vibration to the deflection due to static force is known as : (A) Damping Factor (B) Damping Coefficient (C) Logarithmic Decrement (D) Magnification Factor

Last Answer : Magnification Factor

Description : A fluid in equilibrium cannot sustain : (A) tensile stress (B) compressive stress (C) shear stress (D) bending stress

Last Answer : A fluid in equilibrium cannot sustain : shear stress 

Description : A systematic job improvement sequence will consist of : (A) motion study (B) time study (C) job enrichment (D) all of these

Last Answer : A systematic job improvement sequence will consist of : (A) motion study (B) time study (C) job enrichment (D) all of these

Description : Euler’s dimensionless number relates the following : (A) Inertial force and gravity (B) Viscous force and Inertial force (C) Pressure force and Inertial force (D) Pressure force and viscous force

Last Answer : Euler’s dimensionless number relates the following : Pressure force and Inertial force

Description : Military type of organisation is known as : (A) line organisation (B) functional organisation (C) line and staff organisation (D) line, staff and functional organisation 

Last Answer : Military type of organisation is known as : line organisation

Description : A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as 1. Shift 2. Sand wash 3. Swell 4. Scab

Last Answer : A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as Sand wash

Description : The property of sand due to which the sand grains stick together, is called 1. Collapsibility 2. Permeability 3. Cohesiveness 4. Adhesiveness

Last Answer : The property of sand due to which the sand grains stick together, is called Cohesiveness 

Description : In die casting, machining allowance is 1. Small 2. Large 3. Very large 4. Not provided

Last Answer : In die casting, machining allowance is Not provided

Description : The mode of deformation of the metal during spinning is 1.Bending 2.Stretching 3.Bending and stretching 4.Rolling and stretching

Last Answer : The mode of deformation of the metal during spinning is Bending and stretching

Description : Structural sections such as rails, angles, I-beams are made by 1. Hot rolling 2. Hot drawing 3. Hot piercing 4. Hot extrusion

Last Answer : Structural sections such as rails, angles, I-beams are made by Hot rolling

Description : The process extensively used for making bolts and nuts is 1. Hot piercing 2. Extrusion 3. Cold peening 4. Cold heading

Last Answer : The process extensively used for making bolts and nuts is Cold heading

Description : The cold chisels are made by 1. Drawing 2. Rolling 3. Forging 4. Piercing

Last Answer : The cold chisels are made by Forging 

Description : Welding of glass is done by 1. Ultrasonic welding 2. Electron beam welding 3. Laser beam welding 4. Explosive welding

Last Answer : Welding of glass is done by Laser beam welding

Description : Linde welding uses 1.Neutral flame and rightward technique 2.Carburizing flame and rightward technique 3.Neutral flame and leftward technique 4.Oxidizing flame and leftward technique

Last Answer : Linde welding uses Carburizing flame and rightward technique

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