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engineering
introduction mechanical engineering

Questions and Answers of Introduction Mechanical Engineering

In a belt drive pulley acts as:(a) Sliding pair(b) Rolling pair(c) Turning pair(d) None of these
In a flat belt drive prove that \(\frac{T_{1}}{T_{2}}=e^{\mu \theta}\); where \(T_{1}\) is tension in tight side, \(T_{2}\) is tension in slack side, \(\mu\) is coefficient of friction, \(\theta\) is
The speed of a driving shaft is \(80 \mathrm{rpm}\) and the speed of the driven shaft is \(120 \mathrm{rpm}\). The diameter of the driving pulley is given as \(600 \mathrm{~mm}\). Find the diameter
When two pulleys are connected by a cross-belt drive, then both the pulleys rotate in:(a) Same direction(b) Opposite direction(c) Not necessary(d) None of these
What is initial tension in the belt? Explain the effect of centrifugal tension in the belt drive.
Two shafts are arranged parallel to each other at a distance of \(8 \mathrm{~m}\). If the pulleys' diameters mounted on the shafts are of \(600 \mathrm{~mm}\) and 1000 \(\mathrm{mm}\). Find the ratio
Find the condition for maximum power transmission in the belt drive.
A leather belt of density \(1000 \mathrm{~kg} / \mathrm{m}^{3}\), the thickness of \(10 \mathrm{~mm}\) is used to transmit a power of 10 \(\mathrm{kW}\) from a pulley of diameter \(1.2 \mathrm{~m}\)
Length of cross belt connecting two pulleys of radii \(r_{1}\) and \(r_{2}\) and at a center distance \(D\) apart, is:(a) \(\pi\left(r_{1}+r_{2}\right)+\left(r_{1}-r_{2}\right)^{2} / D+2 D\)(b)
Find the expression for the length of belt in the open belt drive.
An open belt drive transmits a power of \(5 \mathrm{~kW}\). The linear velocity of the belt is \(8 \mathrm{~m} / \mathrm{sec}\). The angle of the lap on the smaller pulley is \(165^{\circ}\). The
Angle of contact in cross-belt drive in comparison to open belt drive is:(a) More(b) Less(c) Same(d) None
Find the expression for the length of belt in the cross belt drive.
The gear 1 , mounted on the motor shaft, rotates at \(600 \mathrm{rpm}\). Find the speed of gear 6, mounted on the output shaft. The number of teeth on each gear are given below as (refer Figure
Slip in belt drive is difference between:(a) Angular velocities between two pulleys(b) The linear speed of the rim of pulleys and the belt on it(c) The velocities of two pulleys(d) None of these
What are the various types of chain drive? Explain with neat sketches.
An engine turning \(250 \mathrm{rev} / \mathrm{min}\) drives a \(40 \mathrm{~cm}\) diameter shaft with the help of belt drive system. If the diameter of engine pulleys is \(60 \mathrm{~cm}\)
In belt drives, effect of centrifugal tension is:(a) To increase the driving power(b) To decrease the driving power(c) Nor appreciable on driving power(d) None of these
What are the relative merits and demerits of belt, rope and chain drive?
A flat belt is required to transmit \(35 \mathrm{~kW}\) from a pulley of \(1.5 \mathrm{~m}\) effective diameter running at 300 \(\mathrm{rpm}\). The angle of contact is spread over 11/24 of the
If \(T_{1}\) and \(T_{2}\) are tensions on tight and slack side of belt, \(\theta\) is angle of contact and \(\mu\) is coefficient of friction between belt and pulley, then ratio of tension is:(a)
State the law of gearing.
A V-belt drive transmits \(10 \mathrm{~kW}\) power at 240 rpm. The grooved pulley has a mean diameter of \(1.2 \mathrm{~m}\) and groove angle of \(45^{\circ}\). Taking \(\mu=0.3\) and angle of lap
For maximum power transmission, the maximum tension \(\mathrm{T}_{\max }\) in the belt is equal to:(a) \(\mathrm{Tc}\)(b) \(2 \mathrm{Tc}\)(c) \(3 \mathrm{Tc}\)(d) \(\mathrm{Tc} / 3\)
Define: (i) module, (ii) pressure angle, (iii) pitch point, (iv) addendum, (v) dedendum, (vi) flank, (vii) face, (viii) circular pitch, (ix) dimetral pitch, and (x) pitch circle.
Creep in belt is due to:(a) The elasticity of belt material(b) Elongation of the belt due to tension(c) Differential elongation of the belt due to the difference in tension on two sides of a
Differentiate involute and cycloidal profiles of gear teeth.
Included angle of V-belt is generally:(a) \(10^{\circ}\) to \(20^{\circ}\)(b) \(20^{\circ}\) to \(30^{\circ}\)(c) \(30^{\circ}\) to \(40^{\circ}\)(d) \(50^{\circ}\) to \(60^{\circ}\)
Classify the gears and explain them with neat sketches.
In designation 6 by 19 rope, 6 and 19 respectively stand for:(a) The diameter of wire rope and number of strands(b) The diameter of wire rope and number of wires(c) Number of wires and number of
Explain the phenomena interference and undercutting in gear drive.
A chain drive is used for:(a) Short distance(b) Medium distance(c) Long distance(d) Distance is no barrier
Sketch and describe helical and bevel gear and state applications of each.
Silent chain is made of:(a) Links and blocks(b) Links, pins, bushings, and rollers(c) 3 or more roller chains(d) Inverted tooth and overlapping links
What is belt drive? Describe briefly types of belt drives.
Wire ropes are used for:(a) Low speeds and low tension(b) Low speeds and high tension(c) High speeds and low tension(d) None of these
Explain with a neat sketch worm and worm wheel.
The ratio of the number of teeth and pitch circle diameter is called:(a) Pitch(b) Circular pitch(c) Diametral pitch(d) Module
Write the different methods of power transmission?
The circle passing through the bottom of the teeth of gear is known as:(a) Inner circle(b) Base circle(c) Addendum Circle(d) Dedendum circle
Explain chain drives and rope drives, and their applications?
The circle passing through the top of the teeth of gear is known as:(a) Inner circle(b) Base circle(c) Addendum circle(d) Dedendum circle
Explain belt drives and types of belts used in belt drives?
Pitch circle diameter of an involute gear is:(a) Independent of any other factor(b) Dependent on the pressure angle(c) Constant for a set of meshing gears(d) Proportional to the base diameter
Enumerate the advantages and disadvantages of gear drives.
The surface of the gear below the pitch circle is called:(a) Face(b) Flank(c) Bottom tooth(d) Tooth depth
Derive an equation for the ratio of tension in the belt drive.
Law of the gearing is satisfied if(a) Two surfaces slide smoothly(b) Common normal at the point of contact passes through pitch point on the line joining the centers of rotation(c) The addendum is
Define slip and creep with respect to belt drives.
The slippage does not occur in the belt drive of ____ cross-section.
The difference between dedendum and addendum is known as _____.
Best profile to obtain resistance against wear is ____.
The product of circular pitch and diametral pitch is equal to ____.
The friction moment in clutches with assumption of uniform wear as compared to uniform pressure is:(a) More(b) Less(c) Same(d) None of these
A single plate clutch of both sides effective has outer and inner radii as 300 and \(200 \mathrm{~mm}\). The maximum intensity of pressure at any point in the contact surface should not exceed to
If \(\phi\) be the angle of friction, then radius of friction circle is given by:(a) \(r\)(b) \(r \sin \phi\)(c) \(r \cos \phi\)(d) None of these
Explain the role of clutch in power transmission.
A multi-disc clutch has 3-discs on the driving shaft and 2-discs on the driven shaft. Outside radius of the contact surface is \(180 \mathrm{~mm}\) and inside radius is \(120 \mathrm{~mm}\). Assuming
Friction radius in comparison to worn-out will be:(a) Same(b) More(c) Less(d) None of these
Derive the formula for torque transmitted by a single plate disc clutch assuming uniform pressure.
A cone clutch has a cone angle of \(40^{\circ}\). The maximum pressure between contact surface is limited to \(0.3 \mathrm{~N} / \mathrm{m}^{2}\) and width of conical surface is half of the mean
For new clutches and brakes, friction radius is equal to:(a) \(\frac{D+d}{4}\)(b) \(\frac{1}{3} \frac{D^{3}-d^{3}}{D^{2}-d^{2}}\)(c) \(\frac{1}{2} \frac{D^{3}-d^{3}}{D^{2}-d^{2}}\)(d) \(\frac{1}{3}
Derive the formula for torque transmitted by a cone clutch assuming uniform wear.
There are four shoes in the centrifugal clutch. The mass of each shoe is \(5 \mathrm{~kg}\). When the clutch is at rest, the force exerted by spring on shoes is \(200 \mathrm{~N}\). The clearance
For uniform wear condition of brakes and clutches, friction radius is equal to:(a) \(\frac{D+d}{4}\)(b) \(\frac{1}{3} \frac{D^{3}-d^{3}}{D^{2}-d^{2}}\)(c) \(\frac{1}{2}
Which of the two assumptions: uniform pressure and uniform wear would you like to use in designing friction clutch? Explain the reasons.
A single block brake, as shown in Figure 16.8 (a), has brake drum diameter of \(250 \mathrm{~mm}\). It can withstand \(300 \mathrm{Nm}\) torque at \(500 \mathrm{rpm}\). The coefficient of friction
The commonly used angle between the cone surface and horizontal axis for a cone clutch utilizing leather to asbestos lining is about:(a) \(8^{\circ}\)(b) \(12.5^{\circ}\)(c) \(20^{\circ}\)(d)
Describe the working of centrifugal clutch and express the equation for torque transmitted.
In a double block brake, as shown in Figure 16.8 (c), has drum radius \(=400 \mathrm{~mm}\), angle of contact \((2 \theta)=30^{\circ}\), coefficient of friction \((\mu)=0.25\), the force applied on
In a cone clutch, a given torque can be transmitted by a relatively small axial force if the cone face angle is:(a) More(b) Less(c) Same(d) Any angle
What is the use of the braking system in a vehicle? Classify the various types of brakes.
In a differential band brake as shown in Figure 16.9 (a), the data are given as: radius \(=400 \mathrm{~mm}\), \(a=40 \mathrm{~mm}, b=200 \mathrm{~mm}, l=1,000 \mathrm{~mm}, \theta=\) \(270^{\circ},
For a block brake, the equivalent coefficient of friction is equal to:(a) \(\frac{4 \sin \theta}{2 \theta+\sin 2 \theta} \mu\)(b) \(\frac{2 \sin \theta}{2 \theta+\sin 2 \theta} \mu\)(c) \(\frac{4
Describe the working of internal shoe expanding brake with a neat sketch. Also, derive the expression for braking torque.
In a band and block brake, as shown in Figure 16.10 (a), the data are given as: \(n=12\), angle subtended by each block \(=30^{\circ}\), radius of drum \(=300 \mathrm{~mm}\), block thickness \(=40
The percentage of total brake effort that results from self-energizing action depends on:(a) The location of brake arm pivot point(b) The coefficient of friction(c) The direction of rotation of the
Prove in the band-block brake.\[\frac{T_{0}}{T_{n}}=\left(\frac{1+\mu \tan \theta}{1-\mu \tan \theta}\right)^{n}\]
Following data are given for internal shoe expanding brake as shown in Figure 16.11 (b): Force on each shoe \(=500 \mathrm{~N}\), internal radius of brake drum \((r)=200 \mathrm{~mm}, \mu=0.3\),
In order to prevent the brake arm from grabbing, the moment of friction force about the brake arm pivot point should be:(a) Less than the total required braking effort(b) Greater than the total
Differentiate the functions of coupling, clutch, and brake.
Coupling, which prevents transmission of shock from one shaft to another, is known as:(a) Oldham coupling(c) Flexible coupling(b) Universal coupling(d) Jaw coupling
What is a brake? Describe an internal expanding shoe brake with a neat sketch and state its applications.
In flange coupling, the weakest element is:(a) Flange(b) Bolt(c) Key(d) Shaft
Explain with a suitable diagram, working principle of disc clutch and band brake.
A flange coupling is a:(a) Rigid coupling(b) Flexible coupling(c) Both (a) and (b)(d) None of these
What is coupling? Explain internal expanding shoe brake with a neat sketch.
In flange coupling, the flanges are joined together by:(a) Head less taper bolts(b) Rivets(c) Nuts and bolts(d) Studs
What are the different types of couplings? Explain the centrifugal clutch.
Number of bolts in flange coupling should not be less than:(a) 2(b) 3(c) 4(d) 8
What are bearings? Explain with neat sketch worm and worm wheel.
A universal coupling is:(a) Rigid coupling(b) Flexible coupling(c) Both (a) and (b)(d) None of these
What is brake? How does it differ from clutch? What are various types of clutches? Name type of clutch is used in scooter and car.
A universal coupling is used to connect:(a) Whose axes intersect at a small angle(b) Which are perfectly aligned(c) Which are not aligned(d) Have lateral misalignment
Explain the working of friction clutch with a neat sketch.
Explain the mechanical properties of engineering materials in brief.
Ability of material to resist deformation due to stress is known as:(a) Toughness(b) Stiffness(c) Plasticity(d) Hardness
Explain the experimental set up of tensile testing of steel.
Ability of material to resist fracture due to high impact load is known as:(a) Toughness(b) Stiffness(c) Plasticity(d) Hardness
Explain the methods to measure the hardness of a material.

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