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introduction mechanical engineering

Questions and Answers of Introduction Mechanical Engineering

The efficiency of an actual machine is less than 100%. True or False
The maximum mechanical advantage is the reciprocal of PV’s W slope. True or False
Velocity ratio of a machine is a variable quantity. True or False
The velocity ratio of first system of pulleys is 2n. True or False
The velocity ratio of third system of pulleys is 2n – 1. True or False
In actual machines, mechanical advantage is(a) greater than velocity ratio(b) equal to velocity ratio(c) less than velocity ratio(d) unity
In ideal machines, mechanical advantage is(a) greater than velocity ratio(b) equal to velocity ratio(c) less than velocity ratio(d) unity
The velocity ratio of an inclined plane inclined at angle \(\alpha\) to the horizontal and the weight being pulled up the inclined plane by vertical effort is(a) \(\sin \alpha\)(b) \(\frac{1}{\sin
The law of a machine is given by(a) \(W=m P-c\)(b) \(W=m P+c\)(c) \(P=m W-c\)(d) \(P=m W+c\)
For a machine to be of the self-locking type, its efficiency should be(a) \(W=m P-c\)(b) \(W=m P+c\)(c) \(P=m W-c\)(d) \(P=m W+c\)
A machine is said to be reversible, if its efficiency is(a) equal to \(100 \%\)(b) less than \(50 \%\)(c) more than \(50 \%\)(d) equal to \(50 \%\)
The velocity ratio of first system of pulleys is(a) \(2^{n}\)(b) \(n\)(c) \(2^{n}-1\)(d) \(2^{n}+1\)
The velocity ratio of second system of pulleys is(a) \(2^{n}\)(b) \(n\)(c) \(2^{n}-1\)(d) \(2^{n}+1\)
The velocity ratio of thirds system of pulleys is(a) \(2^{n}\)(b) \(n\)(c) \(2^{n}-1\)(d) \(2^{n}+1\)
If a machine is lubricated, then its(a) velocity ratio increases(b) velocity ratio decreases(c) mechanical advantage increases(d) efficiency decreases
If \(D\) is the diameter of wheel and \(d_{1}\) and \(d_{2}\) diameters of two axles, then velocity ratio is(a) \(\frac{D}{d_{2}-d_{1}}\)(b) \(\frac{D}{2\left(d_{2}-d_{1}\right)}\)(c) \(\frac{2
What is a machine ?
Define a simple machine.
Define a compound machine.
Differentiate between load and effort.
Define mechanical advantage, velocity ratio and efficiency.
What is a lifting machine? Give exaples.
What is a reversible machine ?
What is a self-locking machine ?
Define law of the machine.
What is the maximum mechanical advantage of a machine ?
Why a system of pulleys is used for lifting load ?
What is the velocity ratio of the first system of pulleys ?
What is the velocity ratio of the second system of pulleys ?
What is the velocity ratio of the third system of pulleys ?
What is the velocity ratio of the differential pulley block ?
What is the condition on efficiency for a machine to be reversible ?
What is the condition on efficiency for a machine to be self-locking ?
In a lifting machine, efforts required to lift loads of 250 N and 360 N were 65 N and 80N respectively. The velocity ratio of the machine is 25. Determine the law of the machine and the efficiency to
The following table gives the experimental values for W and P of a lifting machine :Determine the law of the machine. W. N 50 100 150 200 250 P. N 6.5 11 14 18 22
In a wheel and axle, the diameter of wheel is 500 mm and that of the axle 150 mm. Find the velocity ratio. If the load to be lifted is 1500 N, find the effort required for machine efficiency of 60%.
In a differential wheel and axle, the diameter of the larger axle is 250 mm and that of the smaller 225 mm. The diameter of effort wheel is 500 mm. Find the velocity ratio. If an effort of 150 N
In a first system of pulleys, there are 4 movable pulleys. If the efficiency of the system is 80%, find the effort required to lift a load of 5 kN.
In a second system of pulleys, there are 5 pulleys in each block. If an effort of 150 N can just lift a load of 1400 N, find (a) the effort wasted in friction, and (b) load wasted in friction.
In the third system of pulleys, 4 pulleys are arranged. Find the effort required to lift a load of 1 kN if the efficiency of the pulley system is 80%.
In a differential pulley block, the diameter of the smaller pulley is 9/10 th of the larger pulley. Find the load lifted by the block with an effort of 200 N if the efficiency is 45%.
In a worm geared pulley block, the effective diameter of the effort wheel is 250 mm. The worm is single threaded and the worm wheel has 100 teeth. The effective diameter of load drum fixed to it is
A suitable drive for comparatively larger centre distance is(a) chain drive (b) gear drive (c) belt drive (d) rope drive
An axle is subjected to(a) axial load (b) bending load (c) torsional load (d) bending and torsion
A spindle is used on(a) machine tools (b) I.C. engines (c) cranes (d) automobiles
A shaft is subjected to(a) axial load only (b) bending loads only(c) torsional loads only (d) all of the above
The convex periphery of a flat belt pulley is called(a) crown (b) bulge (c) web (d) depression
The standard angle of a V-belt is(a) 30° (b) 35° (c) 40° (d) 45°
The pulley groove angle for a V-belt is(a) equal to V-belt angle (b) less than V-belt angle(c) more than V-belt angle (d) any one of the above
A V-belt is specified by the(a) outside length (b) pitch length (c) inside length (d) average length
The drive used in a bicycle is(a) belt drive (b) rope drive (c) gear drive (d) chain drive
The vertical feed mechanism in a drilling machine uses(a) rack and pinion (b) spur gears (c) helical gears (d) bevel gears
The type of clutch used in trucks and buses is(a) single plate clutch (b) multi-plate clutch(c) cone clutch (d) centrifugal clutch
The clutch used in mopeds is(a) single plate clutch (b) multi-plate clutch(c) cone clutch (d) centrifigal clutch
The clutch normally remains in engaged position in(a) automobiles (b) machine tools(c) elevators (d) cranes
The clutch normally remains in disenged position in(a) buses (b) machine tools(c) scooters (d) tractors
Differentiate between a shaft and an axle?
What are the various types of shafts?
What are the power transmission elements?
What are the various types of flat belt drives?
What are the various types of flat belts?
What are the various types of pulley used for flat belt?
Differentiate between a fast and loose pulley.
Describe various types of grooved pulleys for V-belt.
What are the advantages of gear drive over other drives?
List various types of gears.
Describe various types of gear trains.
State the (i) applications (ii) Advantages (iii) disadvantages of (a) Rope drive (b) Chain drive(c) Gear drive.
State the advantages of chain drive over belt drive. Draw neat sketches of simple and compound gear train.
Explain with neat sketch the working of various types of belt drives used for motion and power transmission.
State the different types of pulleys used in power transmission and define the velocity ratio of pulleys.
What are the main elements of power transmission ? Mention them.
What is belt drive ? Describe briefly types of belts.
With a neat sketch describe open belt and cross belt drive.
Explain with a neat sketch the working of fast and loose pulley.
Write a short note on : Types of belt drive.
Write a short note on : Types of belt drive.11
Explain with a neat sketch fast and loose pulley.
How do you classify mechanical clutches ? Describe multi plate type friction clutch.
Describe the working of a cone clutch. Why a cone clutch has become obsolete ?
What is the function of clutch in automabile vehicle ? Which type of clutch is used in two -wheelers and why ?
With a simple stretch explain the working of disc clutch.
List the various types of dynamometers.
Explain the working of an absorption type dynamometer.
Choose the brittle marterial.(a) Mild steel(b) Cast iron(c) Aluminium(d) Copper
Which is not a physical property of a material?(a) Density(b) refractive index(c) Roughness(d) Thermal expansion
Which is not a mechanical property of a material?(a) Hardness(b) Yield strength(c) Poisson's ratio(d) Endurance limit
Toughness of a material means(a) High strength(b) High hardness(c) Ability to absorb strain energy(d) Limit of proportionality
Hooke's law is obeyed up to the(a) Yield point(b) Ultimate point (c) Breaking point (d) Limit of proportionality
If equal and opposite forces are applied to a body to elongate it, they produce(a) Zero stress(b) Tensile stress(c) Compressive stress(d) Shear stress
If the radius of a wire stretched by a load is doubled. then Young's modulus of elasticity will be(a) Doubled(b) Halved(c) Four times(d) Unaffected
If a material is restricted to deform and heated, it will develop(a) Tensile stress(b) Compressive stress(d) Shear stress(d) No stress
If a material expands freely due to heating, it will develop(a) Tensile stress(b) Compressive stress(c) Shear stress(d) No stress
Longitudinal and lateral strains are(a) Same in nature(b) Opposite in nature(c) Same in magnitude(d) None of the above
Thermal strain is expressed by.(a) \(\alpha . \Delta t\)(b) \(\alpha l . \Delta t\)(c) \(E \alpha . \Delta t\)(d) \(E . \Delta t\)
True strain is given by.(a) \(\bar{\varepsilon}=1+\varepsilon\)(b) \(\bar{\varepsilon}=\ln +(1+\varepsilon)\)(c) \(\bar{\varepsilon}=\frac{1}{1+\varepsilon}\)(d) \(\bar{\varepsilon}=\ln \varepsilon\)
True stress is given by(a) \(\bar{\sigma}=\sigma(1+\varepsilon)\)(b) \(\bar{\sigma}=\frac{\sigma}{1+\varepsilon}\)(c) \(\bar{\sigma}=\sigma(1-\varepsilon)\)(d)
The SI units of stress are:(a) \(\mathrm{kg} / \mathrm{mm}^{2}\)(b) \(\mathrm{N} / \mathrm{mm}\)(c) \(\mathrm{N} / \mathrm{mm}^{2}\)(d) N.mm
The ratio of sudden load to equivalent static load is.(a) 3(b) 2(c) 1.5(d) \(\quad 1 / 2\)
Define true and engineering stresses.

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