Test: Mechanical Engineering- 13

If the work done on a closed system is 20kj/kg, and 40kj/kg heat is rejected from the system, its internal energy decreases by

If a heat engine attains 100% thermal efficiency, it violates

The more effective way of increasing the efficiency of a carnot engine is to

Kelvin-plank law deals with

First law of thermodynamics deals with

All perfect gases change in volume by 1/273th of its original volume at 0ºC for every 1ºC change in temperature, when the pressure remains constant. This statement is called

The absolute zero pressure can be attained at a temperature of

The heat energy stored in the gas and used for raising the temperature of the gas is known as

When a gas is heated at constant pressure

The capacity of refrigerating machine is expressed as

One tonnes of refrigeration is equal to

COP of a carnot heat pump operating between –3ºC and 27ºC is

Oil separator in a refrigeration cycle is installed.

In electrolux refrigerator

The intake charge in a diesel engine consists of

All of followings are correct except: Inlet -valve mach index is dependent on

When crude oil is heated, then which one of the following hydrocarbon is given off first ?

Octane number of natural gas is

The air-fuel ratio of the petrol engine is controlled by

In a four stroke cycle petrol engine, the charge is ignited at

In a four stroke cycle , the minimum temperature inside the engine cylinder occurs at the

The fuel mostly used in boilers is

The incomplete combustion is indicated by the presence of

The diameter of the cylindrical shell of a Lancashire boiler is about

The function of an economizer in a steam power plant is to

Match List-I (Boiler) with List-II and select the correct answer using the codes given below the
lists:

The basic raw material of the nuclear power plant is

Steam coal is

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

An economiser is generally placed between

The draught may be produced by a

The velocity distribution in a viscous flow over a plate is given by

u = 4y – y2

where, u = velocity in m/s at a point distanty fromthe plate. If the coefficient of dynamic viscosityis 1.5 pa.s, What is the shear stress at y = 1m?

In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle
q, sensitivity of inclined tube to sensitivity of U– tube equal to

The centre of pressure of a surface subject to fluid pressure is the point

Match List - I withList -II and select the correct
answer using the codes given below the lists:
List-I
a. Stream line
b. Streak line
c. Path line
d. Equipotential lines
List-II
1. Tracing of motion of any fluid particle
2. Tracing of motion of different fluid particles
3. Identification of location of number of fluid
particles
4. Orthogonal to streak lines
5. Location of equal piezometric head

How is the metacentric height (GM) expressed

Where I =Moment of inertia of the plan of the floating body at the water surface
V=Volume of the body submerged in water
BG =Distance between the center of gravity (G) and the center of Buoyancy (B)

A type of flow in which the fluid particle while moving in the direction of flow rotates about their centre is known as

The length of divergent part of venturimeter in comparision to convergent portion is

The absolute pressure is equal to

A vertically immersed surface is shown in fig. The distance of its centre of pressure from the water surface is

Bernoulli's equation is applied to

The discharge over a rectangular weir, considering the velocity of approach, is

where H₁ =Total height of water above the weir = H + H_a
H=Height of water, over the crest of the weir, and
H_a =Height of water, due to velocity of approach

In an inward flow reaction turbine

The flow ratio in case of Francis turbine varies from

The loss of strength in compression due to overloading is known is as

The following figure shows the stress-strain curve for tensile test on a mild steel specimen.

The upper yield point is represented by the point

If the Young's modulus E is equal to bulk modulus K, then the value of Poisson's ratio is

Which one of the following material has Poisson's ratio more than 1?

The following torsional terms is analogous to bending terms except

Which one of the following portions of the loaded beam shown in the figure is subjected to pure
bending?

The steel bars in reinforced cement concrete beam are located at

Modulus of rigidity may be defined as the ratio of

A bar of length L metres extends by l mm under a tensile force of P. The strain produced in the bar is

The state of stress at a point in a loaded member is shown fig. The magnitude of maximum shear stress is

The shear force at the centre of a simply supported beam with a gradually varying loadfrom zero at both ends to w per metre at the centre , is

In a simple bending of beams, the stress in the beam varies

The matter contained in a body, is called

Two bodies of masses m₁ and m₂ are hung from the ends of a rope, passing over a frictionless
pulley as shown fig. The acceleration of the string will be

The unit of angular velocity is

The motion of a particle round a fixed axis is

The factor of safety for steel and for steady load is

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

The diameter of the cylindrical rod on which threads are cut is known as

Failure of a material is called fatigue when it fails

In static loading stress concentration is more serious in

In case of pressure vessels having closed ends, the fluid pressure induces

The pipe joint mostly used for pipes carrying water at low pressure is

The lead screw of a lathe with nut is a

A Kinematic chain is known as mechanism when

According to Kennedy's therorem, the instantaneous centres of three bodies havingrelative motion lie on a

A Hook's joint is used to connect

The maximum efficiency of worm and worm wheel system is

In which one of the following is a flywheel generally employed

The motion of a shaft in a circular hole is an example of

The relation between number of links (l) and number of joints (j) in a kinematic chain is

The mechanism forms a structure, when the number of degrees of freedom (n) is equal to

Scotch yoke mechanism is used to generate

The relative ability of the liquid metal to fill in the mould at a given temperature is knowns as

which of the following gating ratio represents pressurised gating systems ?

Which of the following are the most likely characteristics in centrifugal casting ?

Which of the following casting process can suitably replace a rolling operation?

Angle between the face and flank of the single point cutting tool is known as

Single point thread cutting tool should ideally have

A turret lathe is useful for

Grinding wheel is balanced

The soldering process is carried out in the temperature range

The main constituents of soldering alloy are

material removed by machanical action in

Grey cast iron has

Which of the following is a point imperfection?

The heat treatment process used for castings is

Induction hardening is basically a

Babbit metal is a

Monel meteal is an alloy of

Loam sand is a mixture of

The welding process used in joining mild steel shanks to high speed drills, is

In shielded arc welding