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engineering
introduction mechanical engineering

Questions and Answers of Introduction Mechanical Engineering

Explain the principle of working of a thermocouple for temperature measurement.
Which of the following is the correct relationship:(a) \(\theta=\frac{T L}{J G}\)(b) \(\theta=\frac{T G}{J L}\)(c) \(\theta=\frac{J G}{T L}\)(d) \(T=\frac{G L}{J \theta}\)
Explain a process of velocity measurement of a fluid.
The length measured by vernier caliper is:(a) Total length \(=\) Main Scale reading \(\times\) Least Count + Vernier Scale reading(b) Total length \(=(\) Main Scale reading + Vernier Scale reading)
Explain the working of a load cell for force and strain measurement.
Sine bar is used to measure:(a) The angle of a workpiece(b) Radius of cylinder(c) Thickness of a job(d) All of the above
Explain the method of pointer and scale for torque measurement.
For the purpose of calibration of measuring instrument, which of the following is used:(a) Screw gauge(b) Slip gauge(c) Dial gauge(d) Ion gauge
Principle of working of micrometer is based on:(a) Screw(b) Bush(c) Coupling(d) Link
Explain the principle of working of a micrometer.
Write short notes on:(a) Sin-bar,(b) Slip Gauge,(c) Combination set.
Enumerate the operations which can be performed on lathe machine.
The cutting edge of the tool is perpendicular to the direction of tool travel in:(a) Orthogonal cutting of metal(b) Oblique cutting of metal(c) Both(d) None of the above
The cutting edge of the tool is inclined at an angle less than \(90^{\circ}\) to the direction of tool travel in:(a) Orthogonal cutting of metal(b) Oblique cutting of metal(c) Both(d) None of the
Explain the various techniques to perform a taper turning on a lathe.
What are the differences between shaper and planer?
In metal cutting operations, discontinuous chips are produced while machining:(a) Brittle materials(b) Ductile materials(c) Hard materials(d) Soft materials
Explain quick return mechanism used in shaper with neat sketch.
In metal cutting operations, continuous chips are produced while machining:(a) Brittle materials(b) Ductile materials(c) Hard materials(d) Soft materials
Explain the working of radial drilling machine with a neat sketch.
Size of shaper is specified by:(a) The length of stroke(b) The size of the table(c) The maximum size of the tool(d) H.P. of motor
Explain the stepped cone pulley drive in the lathe.
Size of planer is specified by:(a) The length of stroke(b) The size of the table(c) The maximum size of the tool(d) H.P. of motor
Differentiate up milling and down milling.
Explain feed mechanism used in a drilling machine.
For harder materials, point angle of drill:(a) Increases(b) Decreases(c) Kept at \(118^{\circ}\)(d) None of the above
A standard ground drill has a point angle of:(a) \(90^{\circ}\)(b) \(100^{\circ}\)(c) \(118^{\circ}\)(d) \(120^{\circ}\)
Draw a neat diagram of the horizontal and vertical milling machine.
One of the important parameters of lathe specification is:(a) Swing over bed(b) Swing over tool post(c) The distance between centers(d) Horse power
What are the various types of milling operations, explain with the neat sketch?
Centering can be done most accurately on:(a) Four-jaw chuck(b) Three-jaw chuck(c) Lathe dog(d) Collet
Write short notes on counter boring, counter sinking, spot facing, and trepanning.
In gang milling:(a) Several jobs can be performed in one set up(b) One job is completed on several milling machines(c) Two or more cutters are mounted on the arbor then all remove the metals
What do you mean by grinding? How it differs from milling?
Spot facing is the operation of:(a) Enlarging the end of a hole cylindrically(b) Cone-shaped of the enlargement of the end of a hole(c) Smoothing and squaring the surface around a hole(d) Sizing and
Draw a neat sketch of the drill bit and explain all the terminology used for nomenclature.
counter sinking is the operation of:(a) Enlarging the end of a hole cylindrically(b) Cone-shaped of the enlargement of the end of a hole(c) Smoothing and squaring the surface around a hole(d) Sizing
Discuss the method of nomenclature of grinding wheel.
Reaming is an operation of:(a) Enlarging the end of a hole cylindrically(b) Cone-shaped of the enlargement of the end of a hole(c) Smoothing and squaring the surface around a hole(d) Sizing and
Explain the method of centerless grinding.
Explain the various methods of grinding.
Drilling is a type of:(a) Oblique cutting(b) Simple cutting(c) Uniform cutting(d) Orthogonal cutting
Drill diameter is measured over the:(a) Main body(b) Margins at the drill point(c) Heel(d) Lips
Discuss the working of the cylindrical grinding machine with a neat sketch.
The chip is cut off at thinnest place and then chip thickness increases along chip length in:(a) Up milling(c) End milling(b) Down milling(d) Climb milling
The cutting force tends to lift the work piece in:(a) Conventional milling(b) Down milling(c) Climb milling(d) Form milling
Discuss the working of plane grinding machine with a neat sketch.
Maximum friction is caused in:(a) Up milling(b) Down milling(c) End milling(d) Climb milling
Discuss the surface finishing methods with various applications.
Write the difference between shaper and slotter machines?
Advantages of conventional (up) milling is:(a) Older machines have backlash in their lead screws can be used(b) On sand casting cutter is not damaged(c) Better finish obtained on steel but not on
Explain the different types of grinding process with sketches.
Disadvantage of conventional milling is:(a) Chip gets picked up and carried around the cutter, thereby spoiling the finish(b) On steel, the finish may be slightly rougher(c) The machine must have
Draw a well-labeled neat sketch of lathe machine and state the functions of its different parts.
With the help of a neat sketch, explain the working of a universal milling machine.
After dressing operation, a grinding wheel is required to adjust the:(a) Guard(b) Eye shield(c) Tool rest(d) All of the above
Explain any two milling operations.
In the case of cylindrical grinding, the depth of cut normally used for roughing is:(a) \(0.05 \mathrm{~mm}\)(b) \(0.01 \mathrm{~mm}\)(c) \(0.005 \mathrm{~mm}\)(d) \(0.001 \mathrm{~mm}\)
In metal cutting operation, chips are formed due to ____ of metal.
Grinding is a process of removing materials by:(a) Cutting action(b) Rubbing action(c) Wearing action(d) Polishing action
Explain with figure taper turning with compound slide swiveling method.
Explain with figure working principle of centerless grinding machine.
In the case of cylindrical grinding, the depth of cut normally used for roughing is:(a) \(0.05 \mathrm{~mm}\)(b) \(0.01 \mathrm{~mm}\)(c) \(0.005 \mathrm{~mm}\)(d) \(0.001 \mathrm{~mm}\)
With a neat sketch, explain the principle and operation to produce a “taper’ on a lathe by tail stock set over method.
The work piece cannot be held in a lathe chuck can be clamped to a ____ mounted on a headstock spindle.
The cutting action of a shaper occurs only on the ____ stroke of the ram.
Differentiate between the cross slide and compound slide.
List any four differences between the horizontal milling machine and vertical milling machine.
Differentiate between (i) Counter sinking and counter boring and (ii) Reaming and Boring.
Explain plane milling, end milling, slot milling, with a neat sketch.
A slotter can be considered as a ____ shaper having only vertical movement of ____.
Any number of equal division can be obtained on milling machine by ____.
Sketch a radial drilling machine and explain its working.
Draw the neat sketch of the horizontal milling machine and explain parts.
List the four elements which specify the size of the Lathe.
With a neat sketch, explain the following lathe operations.Facing, Cylindrical turning, Knurling, Thread cutting.
\(50 \mathrm{~m}^{3}\) of air at \(18^{\circ} \mathrm{C}\) DBT and \(12^{\circ} \mathrm{C}\) WBT are mixed with \(20 \mathrm{~m}^{3}\) of dry air at \(32^{\circ} \mathrm{C}\) DBT and \(24^{\circ}
State Kook’s law.
Define internal combustion engine and explain how it is different from external combustion engines?
In I.C. engines, power developed inside the cylinder is known as:(a) Brake horse power(b) Indicated horse power(c) Pumping power(d) None of the above
In an air standard Otto cycle, the pressure and temperature at the start of compression stroke are 1 bar and \(30^{\circ} \mathrm{C}\), respectively. The temperature at the end of compression is
The power spent in suction and exhaust strokes are known as:(a) Brake horse power(b) Indicated horse power(c) Pumping power(d) None of the above
What are the different bases for classification of an internal combustion engine? Explain with a neat sketch of various types of the engines.
In an Otto cycle, air at 1 bar and \(300 \mathrm{~K}\) is compressed isentropically until the pressure rises to 16 bar. The heat is added at constant volume until the pressure rises to 30 bar.
The difference of total power produced and pumping power is known as:(a) Brake horse power(b) Indicated horse power(c) Net indicated horse power(d) None of the above
Differentiate S.I. engine and C.I. engine.
The power available at the shaft of an I.C. engine is known as:(a) Brake horse power(b) Indicated horse power(c) Net indicated horse power(d) None of the above
A diesel engine has a compression ratio of 16 and cut-off take place at \(7 \%\) of the stroke. Find the air standard efficiency.
In an air standard diesel cycle, the temperatures at the start and at the end of compression stroke are \(298 \mathrm{~K}\) and \(800 \mathrm{k}\), respectively. The energy added at constant pressure
Explain the fundamental differences between Otto cycle and Diesel cycle mentioning the advantages over each other.
In a four-stroke engine, number of revolutions of the crankshaft for completion of working cycle is:(a) One(b) Two(c) Three(d) Four
What are the fundamental differences between two-stroke and four-stroke engines?
In an ideal duel cycle, the compression ratio is 12 and maximum pressure is limited to \(80 \mathrm{bar}\). If the heat supplied is \(2,000 \mathrm{~kJ} / \mathrm{kg}\), find the temperature and
In a two-stroke engine, number of revolutions of the crankshaft for completion of working cycle is:(a) One(b) Two(c) Three(d) Four
Explain the structure and working of four-stroke petrol engine with a neat sketch.
A dual cycle operates with a compression ratio \(r_{\mathrm{k}}=10\) and cut-off ratio 1.6. The maximum pressure is given by \(P_{\max }=60 P_{1}\), where \(P_{1}\) is the pressure before
Explain the structure and working of four-stroke diesel engine with a neat sketch.
Theoretically, four-stroke engine should develop power as compared to two-stroke engine is:(a) Half(b) Same(c) Double(d) Four times
The following readings were taken during the test of four-stroke single cylinder petrol engine:Load on brake drum \(=50 \mathrm{~kg}\);Diameter of brake drum \(=1,250 \mathrm{~mm}\)Spring balance
At the same speed, the number of power strokes given by a two-stroke engine as compared to a four-stroke engine is:(a) Half(b) Same(c) Double(d) Four times

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