Mock Test: SSC JE (ME)- 13 - Mechanical Engineering

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.