# Test: Mechanical Engineering- 12

## 100 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Test: Mechanical Engineering- 12

Description
This mock test of Test: Mechanical Engineering- 12 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 100 Multiple Choice Questions for Mechanical Engineering Test: Mechanical Engineering- 12 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Mechanical Engineering- 12 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Test: Mechanical Engineering- 12 exercise for a better result in the exam. You can find other Test: Mechanical Engineering- 12 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

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QUESTION: 2

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QUESTION: 3

### Which of the following conditions are favourable for liquefaction of a gas?

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QUESTION: 4

The work done in a reversible adiabatic process from state 1 to states 2 is given by

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QUESTION: 5

Ratio of specific heat for an ideal gas is given by

Solution: QUESTION: 6

The Characteristic equation of gases PV = nRT holds good for

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QUESTION: 7

In thermodynamics analysis, a pure substance is that which

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QUESTION: 8

The measurement of a thermodynamic property known as temperature is based on

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QUESTION: 9

The behaviour of super heated vapour is similar to that of

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QUESTION: 10

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QUESTION: 11

The processes occurring in open system which permit the transfer of mass to and from the system, are known as

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QUESTION: 12

A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called

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QUESTION: 13

One tonne refrigerator machine means that

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QUESTION: 14

Air refrigeration cycle is generally employed in

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QUESTION: 15

Which is usually the costliest item in a refrigeration system ?

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QUESTION: 16

The relative coefficient of performance is equal to

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QUESTION: 17

An external gear with 60 teeth meshes with a pinion of 20 teeth, module being 6 mm. What is the centre distance in mm ?

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QUESTION: 18

The top of the piston in two-stroke engine is

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QUESTION: 19

Main advantage of a two- stroke engine over four-stroke engine is

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QUESTION: 20

Compression ratio in case of CI engine is in the range of

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QUESTION: 21

For an Otto cycle, the increase in compression ratio leads to

Solution: QUESTION: 22

For the same peak pressure and work output

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QUESTION: 23

In a four stroke cycle petrol engine, the expansion

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QUESTION: 24

The spark ignition engines are governed by

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QUESTION: 25

In thermal power plants, the dearator is used mainly to

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QUESTION: 26

Which device is used in thermal power plants to reduce level of pollution?

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QUESTION: 27

Which one of the following is NOT and accessory for the boiler ?

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QUESTION: 28

The shape of the lid of a manhole in a boiler is

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QUESTION: 29

Match List-I (Type of boiler) with List-II (Features) select the correct answer using the
codes given below the lists:
List-I
a. Benson
b. Stirling
c. Babcock-Wilcox
d. Cochran
List-II
1. Vertical fire tube
2. Horizontal fire tube
3. Bent water tube
4. Once through flow
5. Inclined water tube Solution:
QUESTION: 30

In parson's turbine ifa is nozzle angle, then what is the maximum efficiency of the turbine

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QUESTION: 31

The critical pressure ratio for maximum discharge through a nozzle is given by

Solution: QUESTION: 32

The shell of the Cochran boiler is made hemispherical

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QUESTION: 33

Which of the following statement is wrong?

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QUESTION: 34

Blow off cock in a boiler is used to

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QUESTION: 35

The time of oscillation of a floating body with increase in metacentric height will be

Solution: QUESTION: 36

All the terms of energy of Bernoulli's equation have dimension of

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QUESTION: 37

The turbulent flow has

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QUESTION: 38

The logarithmic velocity distribution is observed in

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QUESTION: 39

If a set of pipes described by (L1, D1, f1), (L2,D2,f2)....... are connected in series then an
equivalent pipe (Le, De,fe) is related as

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QUESTION: 40

An open channel of symmetric right angled triangular cross-section is conveying a discharge Q. Taking gas the acceleration due to gravity,what is the critical depth ?

Solution:
QUESTION: 41

Match List I (Physical properties of fluid) with List II (Dimensions/definitions) and select the
correct answer using the codes given below the lists  Solution:
QUESTION: 42

The Bernoulli's equation is based on the assumption that

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QUESTION: 43

The discharge through an external mouthpiece is given by

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QUESTION: 44

The total energy line lies over the hydraulic gradient line by an amount equal to the

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QUESTION: 45

The viscosity of water at 20º C is

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QUESTION: 46

A fluid whose viscosity does no change with the rate of deformation of shear strain is known as

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QUESTION: 47

A fluid which obeys the Newton's law of viscosity is termed as

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QUESTION: 48

The point of contraflexure in a beam is at the location where the

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QUESTION: 49

Consider the simply supported beam AB subjected to the point loads of equal magnitudeas shown in the diagram below: Which one of the following statement is correct?The position CD of the beam is

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QUESTION: 50

At the neutral axis of simply beam, there is

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QUESTION: 51

A cantilever beam of rectangular cross-section is subjected to a concentrated load at its free end. The state of stress at a point P on the centroidal longitudinal axis of beam is given by

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QUESTION: 52

If the principal stresses on a plane stress problem are s1 = 100 MPa and s2 = 40 MPa, then themagnitude of shear stress (in MPa) will be

Solution: QUESTION: 53

At a principal plane

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QUESTION: 54

Maximum shear stress in a Mohr's circle

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QUESTION: 55

The maximum principal stress theory is also known as

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QUESTION: 56

A thin cylindrical shell of internal diameter d and thickness 't' is subjected to internal pressure 'p'. The change in diameter is given by

Solution:   QUESTION: 57

The ratio of bulk modulus to Young's modulus for a Poisson's ratio of 0.25 will be

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QUESTION: 58

Within elastic limit, shear stress is ......... shear strain.

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QUESTION: 59

A beam extending beyond the supports is called

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QUESTION: 60

The linear velocity of a body rotating atw rad/ s along a circular path of radius r is given by

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QUESTION: 61

The periodic time (T) is given by

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QUESTION: 62

A pendulum which executes one beat per second is known as

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QUESTION: 63

The ideal angle of banking provided on the curves on roads depends upon

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QUESTION: 64

The piston rod and the cross head in a steam engine are usually connected by means of

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QUESTION: 65

Match List-I (Application) with List-II (Joint) and select the correct answer using the code
given below the lists:  Solution:
QUESTION: 66

The endurance limit i.e., resistance to fatigue of a machine element can be improved by

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QUESTION: 67

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QUESTION: 68

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

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QUESTION: 69

According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by

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QUESTION: 70

The efficiency of a riveted joint is equal to

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QUESTION: 71

The difference between addendum and dedendum is known as

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QUESTION: 72

Train value of a gear train is

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QUESTION: 73

Which of the following machines does not require a flywheel ?

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QUESTION: 74

A Hartnell governor is a governor of the

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QUESTION: 75

Sensitivity of an isochronous governor is

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QUESTION: 76

For a governor running at constant speed, what is the value of the force acting on the sleeve

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QUESTION: 77

Which one of the following causes whirling of shafts?

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QUESTION: 78

The pair is known as a higher pair, when the relative motion between the elements of a pair is

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QUESTION: 79

An automobile steering gear is an example of

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QUESTION: 80

In a steam engine, the link constitutes a

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QUESTION: 81

Cores are used in the casting to

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QUESTION: 82

Cold shut (lap) may occur in products obtained by

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QUESTION: 83

Collapsible tooth paste tubes are manufactured by

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QUESTION: 84

Cutting tool material 18-4-1 HSS has which one of the following composition

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QUESTION: 85

Milling operation which produces flat vertical surfaces on both side of a work piece is known as

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QUESTION: 86

The purpose of reaming is

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QUESTION: 87

Grey cast iron is usually welded by

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QUESTION: 88

The temperature of plasma torch is of the order is

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QUESTION: 89

Which of the following material is best cut by oxy-cutting process ?

Solution:
QUESTION: 90

The temperature of the heat produced by an arc is around

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QUESTION: 91

When a steel containing more than 0.8% carbon in cooled slowly below the lower critical point, it consists of

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QUESTION: 92

When the steel is normalised, its

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QUESTION: 93

Which of the following is a case hardening process?

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QUESTION: 94

Induction hardening is basically a

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QUESTION: 95

In oblique cutting system, the cutting edge of the tool

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QUESTION: 96

Ceramic tools are fixed to tool body by

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QUESTION: 97

The tool life is affected by

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QUESTION: 98

Tool life is generally better when

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QUESTION: 99

Which of the following operation is first performed ?

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QUESTION: 100

In drilling brass, a drill with

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