Mechanical Engineering

If angle of contact of a drop of liquid is acute then

A cantilever carrying uniformly distributed load W over its full length is propped at its free end such that it is at the level of the fixed end. The bending moment will be zero at its free end and also at

Match List I (Physical properties of fluid) with List II (Dimensions/definitions) and select the
correct answer using the codes given below the list

The centre of gravity of a hemisphere lies at a distance of 3r / 8 from its base measured along the vertical radius.

If a two-mass system is dynamically equivalent to a rigid body, then the system will NOT satisfy the condition that the  

Euler equation for water turbine is derived on the basis of

If the length of the cantilever beam is halved, then natural frequency of the mass M at the end of this cantilever beam of negligible mass is increased by a factor of

For a cotter, the ratio of thickness to width is

The most preferred type of carburettor is

A smooth cylinder lying on a __________ is in neutral equilibrium.

Assertion (A): When a link has pure translation, the resultant force must pass through the centre of gravity.  

Reason (R): The direction of the resultant force would be in the direction of acceleration of the body.

A cylindrical elastic body subjected to pure torsion about its axis develops

Direction: Each of the next consists of two statements, one labeled as the 'Assertion (A)' and
the other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:
Codes:
(a) Both A and R are individually true and R is the correct explanation of A.
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true 

Statement (I) : Specific output of a SI engine is higher than the CI engine
Statement (II): Its higher engine mixture result in ability to burn richer mixture result in increased
energy conversion rate.

A circular shaft subjected to twisting moment results in maximum shear stress of 60 MPa. Then the maximum compressive stress in the material is

A one dimensional flow is one which

In the design of connecting rod small end bearing, the value of permissible bearing pressure to be used is :

The mass of each ball of a Proell Governor is 3 kg and the weight on the sleeve is 20 kg. Each arm is 220 mm long and the pivots of upper and lower arms are 20 mm from the axis. For the mid position of the sleeve, the extension links of the lower arms are vertical, the height of the governor is 180 mm, the speed is 150 rpm and the radius of path of rotation of the masses is 147 mm. Determine the lengths of the extension link (in mm).

A manufacturer can produce 12000 bearings per day. The manufacturer received an order of 8000 bearings per day from a customer. The cost of holding a bearing in stock is Rs.0.20 per month. Setup cost per production run is Rs.500. Assuming 300 working days in a year, the frequency of production run should be

Screws used for power transmission should have

If a number of forces are acting at a point, theirresultant will be inclined at an angle θ with the horizontal, such that

According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then

Preheating before welding is done is

Thermal efficiency of CI engine is higher than that of SI engine due to

A cantilever is subjected to a uniformly distributed load W over its whole length L and a concentrated upward force W at its free end. The deflection of the free end is
 

The fittings mounted on the boiler for its proper and safe functioning is a

 If a shaft is rotating at N revolutions per minute with an applied torque T N-m, the power being transmitted by the shaft in watt is

The acceleration respo nsible for change in direction in circular motion is

Which one of the following combinations of angles will carry the maximum load as a column?

Plasticity must be considered in designing for processes except

In which of the following case, the turning moment diagram will have least variations:

In a vapour compression refrigeration system, throttle valve is used in place of an expander because

The c.g. of a link in any mechanism would experience

300 kJ/s of heat is supplied at a constant fixed temperature of 290ºC to a heat engine. The heat rejection takes place at 8.5ºC. Then match the following.

When the expansion or compression takes place according to the law pv_n = C, the process is known is

Which one of the following accessories is connected to the steam supply pipe line to maintain constant pressure?

At a point in two-dimensional stress system s_x = 100 N/mm²,s_y =t_xy= 400 N/mm. what drawn with a scale of 1cm = 100 N/mm².

A body is subjected to a pure tensile stress of 100 units. What is the maximum shear produced in the body at some oblique plane due to the above ?

In a two dimensional problem the state of pure shear at a point is characterized by

Plane stress at a point in a body is defined by principal stresses 3s and s. The ratio of the normal stress to the maximum shear stress on the plane of maximum shear stress is

In a tensile test, near the elastic limit zone

A slender bar of 100 mm2 cross-section is subjected to loading as shown in the figure below. If the modulus of elasticity is taken as 200 × 109. pa. then the elongation produced in the bar will be

Damping capacity of a material is its ability to

An overhanging beam is

According to Lame's equation, hoop stress for a thick cylinder at any point at a radius r from centre is equal to

 

When a body is placed over a liquid, it will sink down if

In figure if the pressure of gas in bulb A is 50 cm Hg vacuum and P_atm = 76 cm Hg, the height of column H is equal to

A spring of length 'L' is cut into 5 equal parts if initial spring stiffness was R the final stiffness after
parallel combination of all 5 parts will be

Constant bending moment over span 'l' will occur in

The shearing area of a key of length 'L', breadth 'b' and depth 'h' is equal to   

A round rod of annealed bras 70-30 is being drawn from a diameter of 8 mm to a diameter of 4 mm at a speed of 0.8 m/s. (k = 895 MPa, n = 0.49)

Q.

The power required in this operation is

The boring bar of a boring machine is 25 mm in diameter. During operation, the bar gets twisted though 0.01 radians and is subjected to a shear stress of 42 N/mm². The length of the bar is (Taking G = 0.84 × 10⁵ N/mm²)

When a shear stress is applied to a substance, it is found to resist it by static deformation, the  substance is 

If two bodies having masses m₁ and m₂ (m₁>m₂) have equal kinetic energies, the momentum of body having mass m₁ is __________ the momentum of body having mass m₂.

Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that

The angle of inclination with the vertical is __________ if the cyclist is running at a faster speed than that when he is running at a slower speed.

The ratio of the ultimate stress to the design stress is known as

The factor of safety for steel and for steady load is

If maximum speed is 210 rpm and minimum speed is 190 rpm then coefficient of fluctuation of speed is

The mode of deformation of the metal during spinning is

Locomotive boiler is a