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# Test: Mechanical Engineering- 6

## 100 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Test: Mechanical Engineering- 6

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This mock test of Test: Mechanical Engineering- 6 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 100 Multiple Choice Questions for Mechanical Engineering Test: Mechanical Engineering- 6 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Mechanical Engineering- 6 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Test: Mechanical Engineering- 6 exercise for a better result in the exam. You can find other Test: Mechanical Engineering- 6 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

Solution:
QUESTION: 3

### Match List - I with List -II the following: Solution:
QUESTION: 4

Heat transferred to a closed stationary system at constant volume is equal to

Solution:

The first law of thermodynamics is dQ= du+dw. (Where symbols have usual meaning) For a chemical system dw= pdv, but when the volume is constant, dv=0 and, dQ=du. So, under the condition of constant volume heat transferred is equal to the change in the internal Energy of the system.

QUESTION: 5

It is desired to bring about a certain change in the state of a system by performing work on thesystem under adiabatic conditions.

Solution:
QUESTION: 6

Key concept in analyzing the filling of an evacuated tank is

Solution:
QUESTION: 7

In the vander waal’s equation, the unit of constant a is

Solution: QUESTION: 8

An Open system is one in which

Solution:
QUESTION: 9

The specific heat of water is

Solution:
QUESTION: 10

Which of the following statement is correct ?

Solution:
QUESTION: 11

The....... states that changes of internal energy of a perfect gas is directly proportional to the change of temperature.

Solution:
QUESTION: 12

When gas is heated at constant pressure, the heat supplied is utilised in

Solution:
QUESTION: 13

Thermoelectric refrigeration system is based on

Solution:
QUESTION: 14

A reversible heat engine runs between high temperature T1 and low temperature T2. The work output of this heat engine is used to run a reversible refrigeration cycle absorbing heat at temperature T2. What is the COP of the combined system ?

Solution:  QUESTION: 15

Superheating in refrigeration cycle

Solution:

Superheating is a refrigeration cycle decrease coefficient of performance. In practice, there is a loss of 1% of COP for every 2.5C of superheating in suction line. The lining of suction lines is a solution to minimize undesirable heat accumulation.

Hence, the answer is decreases COP.

QUESTION: 16

A one tonner refrigerating machine means that

Solution:
QUESTION: 17

Hydrogen is used in electrolux refrigeration system so as to ....... the rate of evaporation ofthe liquid ammonia passing through the evaporator.

Solution:
QUESTION: 18

Engine of different cylinder dimensions, power and speed are compared on the basis of

Solution:
QUESTION: 19

Match the List-I (IC engine parts) with List-II (Materials) following : Solution:
QUESTION: 20

When the engines are built to withstand the same thermal and mechanical stresses

Solution:
QUESTION: 21

The float in the carburetor of a petrol engine controls

Solution:
QUESTION: 22

In an I.C. engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as

Solution:
QUESTION: 23

The exhaust valve in a four stroke cycle petrol engine

Solution:
QUESTION: 24

Diesel as compared to petrol is

Solution:
QUESTION: 25

The crown of the fire box is made hemispherical in order to

Solution:
QUESTION: 26

Which of the following is not the desirable property of a good fuel?

Solution:
QUESTION: 27

Calorific value of gaseous fuels can be found be

Solution:
QUESTION: 28

Reheating of steam under ideal condition takes place at constant

Solution:

Reheating of steam under ideal condition takes place at constant temperature.In reheating type boiler-turbine plant the heat/energy transferred into the steam per kilo is higher and enthalpy loss in condenser is relatively lower (it is always constant kJ/kg).

QUESTION: 29

Atomic number of an element in the periodic table represents the numbers of

Solution:
QUESTION: 30

Boiler water reactor employs

Solution:
QUESTION: 31

Match List-I (Turbine types) with List-II (Flow direction) the following: Solution:
QUESTION: 32

Fire tube boilers are

Solution:
QUESTION: 33

Lancashire boiler is

Solution:
QUESTION: 34

The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called

Solution:
QUESTION: 35

The condition of 'no slip' at boundaries is applicable to

Solution:
QUESTION: 36

The fluid which obey's the Newton's law of viscosity is called

Solution:
QUESTION: 37

Bourdon gauge measures

Solution:
QUESTION: 38

A curved surface is submerged in a static liquid. The horizontal component of pressure force on it is equal to

Solution:
QUESTION: 39

The metacenter is

Solution:
QUESTION: 40

For pipes, laminar flow occurs when Reynolds number is

Solution:
QUESTION: 41

The drag coefficient of laminar flow varies with Reynolds number (Re) as

Solution:
QUESTION: 42

The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called

Solution:
QUESTION: 43

The liquid used in manometers should have

Solution:
QUESTION: 44

If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in

Solution:
QUESTION: 45

A flow through a long pipe at decreasing rate is called

Solution:

At a given instant in time the conditions at every point are the same, but will change with time. An example is a pipe of constant diameter connected to a pump pumping at a constant rate which is then switched off.

QUESTION: 46

The total energy of a liquid particle in motion is equal to

Solution:
QUESTION: 47

Barometer is used to measure

Solution:
QUESTION: 48

Rupture stress is

Solution:
QUESTION: 49

The stress-strain curve for glass during tensile test would exhibit

Solution:
QUESTION: 50

The number of elastic constants for a completely anisotropic elastic material are

Solution:
QUESTION: 51

In terms of bulk modulus (K) and modulus of rigidity (G), the Poisson's ratio can be expressed
as

Solution: QUESTION: 52

Torsion bars are in series

Solution:

If two or more shaft of different material, diameter or basic forms are connected together in such a way that each carries the same torque, then the shafts are said to be connected in series.

QUESTION: 53

The Point of contra-flexure occurs only in

Solution:
QUESTION: 54

The property of a material by virtue of which it can be beaten or rolled into plates is called

Solution:
QUESTION: 55

A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then

Solution:
QUESTION: 56

The volumetric strain is the ratio of the

Solution:
QUESTION: 57

The product of Young's modulus (E) and moment of inertia (I) is known as

Solution:
QUESTION: 58

Which of the following is the correct torsion equation ?

Solution:
QUESTION: 59

Match List-I with List-II:
List-I
a. Maximum normal stress theory
b. Maximum principal strain theory
c. Maximum shear stress theory
List-II
1. Mise's and Henkey's theory
2. Rankine's theory
3. St Venant's theory
4. Guest's Tresca's theory Solution:
QUESTION: 60

A machine having an efficiency greater than 50%, is known as

Solution:

Reversible machine : A machine which is capable of doing work in the reverse direction even after the removal of effort ,load get lifted is called Reversible machine.

{for reversible machine efficiency will be greater than 50%}

QUESTION: 61

The coefficient of restitution for inelastic bodies is

Solution:
QUESTION: 62

One joule is equal to

Solution:
QUESTION: 63

The rate of doing work in known as

Solution:
QUESTION: 64

Which one of the following graph represents Von-Mises yield criterion

Solution: QUESTION: 65

Which of the following joint is commonly used for pipes carrying water at low pressure

Solution:
QUESTION: 66

In a gib and cotter joint, the gib and cotter are subjected to

Solution:
QUESTION: 67

The endurance of fatigue limit is defined as the maximum value of the stress which a polishedstandard specimen can without failure, for infinite number of cycles, when subjected to

Solution:
QUESTION: 68

Factor of safety for fatigue loading is the ratio of

Solution:
QUESTION: 69

In designing thick cylinders, the equation used is

Solution:
QUESTION: 70

Cast iron pipes are mainly used

Solution:
QUESTION: 71

Match the List -I (Kinematic pair) with List - II (Application) Solution:
QUESTION: 72

The Grubler's criteria for planar mechanism is given by f = 3(n–1) –2j in the equation is

Solution:
QUESTION: 73

The instantaneous center of a slider moving in a curved surface lies

Solution:
QUESTION: 74

Coriolis component of acceleration is always

Solution:
QUESTION: 75

A Hooke's joint is used to connect two

Solution:
QUESTION: 76

The gear train usually employed in clocks is a

Solution:
QUESTION: 77

When the nature of contact between the elements of a pair is such that it can only slide relative tothe other, the pair is known as a

Solution:
QUESTION: 78

The minimum periodic time of a compound pendulum is

Solution:
QUESTION: 79

The height of a Watt's governor (in metres) is equal to

Solution:
QUESTION: 80

A hartnell governor is a

Solution:
QUESTION: 81

Which of the following materials requires highest shrinkage allowance ?

Solution:

Cast iron = 10mm/m

Steel=20mm/m

Aluminium = 15mm/m

Brass =15 mm/m

Therefore steel needs highest pattern allowance.

QUESTION: 82

Which of the following casting mould uses metal moulds ?

Solution:
QUESTION: 83

Which of the following casting mould uses metal moulds ?

Solution:
QUESTION: 84

Warm metal working is applied extensively for

Solution:
QUESTION: 85

What does hydrostatic pressure in extrusion process improve ?

Solution:
QUESTION: 86

The main source of heat generation in metal cutting is

Solution:
QUESTION: 87

Size of a shaper is given by

Solution:
QUESTION: 88

Which of the following is an example of orthogonal cutting ?

Solution:
QUESTION: 89

Flux is used in soldering to

Solution:
QUESTION: 90

The phenomenon of weld decay occurs in

Solution:
QUESTION: 91

Which of the following material has maximum malleability ?

Solution:
QUESTION: 92

The iron ore mostly used for the production of pig iron is

Solution:
QUESTION: 93

Quenching is not necessary when hardening is done by

Solution:
QUESTION: 94

Age hardening is related to

Solution:
QUESTION: 95

During hot working of metals

Solution:
QUESTION: 96

Cold working of metal increases

Solution:
QUESTION: 97

Cores are used to

Solution:
QUESTION: 98

Which of the following welding process uses nonconsumable electrodes ?

Solution:
QUESTION: 99

Most of the oxy-acetylene welding is done with

Solution:
QUESTION: 100

The angle made by the face of the tool and the plane parallel to the base of cutting tool is called

Solution: