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# Test: Mechanical Engineering- 3

## 100 Questions MCQ Test Mock Test Series for SSC JE Mechanical Engineering | Test: Mechanical Engineering- 3

Description
This mock test of Test: Mechanical Engineering- 3 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 100 Multiple Choice Questions for Mechanical Engineering Test: Mechanical Engineering- 3 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Mechanical Engineering- 3 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Test: Mechanical Engineering- 3 exercise for a better result in the exam. You can find other Test: Mechanical Engineering- 3 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

### An Ideal gas at 27ºC is heated at constant pressure till the volume becomes three times. The temperature of the gas will then be

Solution: QUESTION: 2

### If the time taken by a system to execute a process through a finite gradient is infinitely large,the process

Solution:  QUESTION: 3

### Gas contained in a closed system consisting of piston cylinder arrangement is expand. Workdone by the gas during expansion is 50 kJ. Decreases in internal energy of the gas duringexpansion is 30 kJ. Heat transfer during the process is equal to

Solution: QUESTION: 4

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

Assertion (A): The changes in heat and work cannot be expressed as difference between the
end states.
Reason (R) : Heat and work both are exact differentials.

Solution: QUESTION: 5

For a given value of TH (Source temperature) for a reversed Carnot cycle, the variation of TL(Sink temperature) for different values of COP is represented by which one of the following graphs ?

Solution:
QUESTION: 6

Efficiency of a Carnot engine is 75%. If the cycle direction is reversed, COP of the reversedCarnot cycle is

Solution:  QUESTION: 7

Gibb's free energy 'G' is defined as

Solution:
QUESTION: 8

The state of a substance whose evaporation from its liquid state is complete, is known as

Solution:
QUESTION: 9

The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (c,) is

Solution:
QUESTION: 10

A process, in which the temperature of the working substance remains constant during itsexpansion or compression, is called

Solution:
QUESTION: 11

Carnot cycle consists of

Solution:
QUESTION: 12

The absolute zero pressure will be

Solution:
QUESTION: 13

A condenser of a refrigeration system rejects heat at rate of 120 kW, while its compressorconsumes a power of 30 kW. The coefficient of performance of the system would be

Solution: QUESTION: 14

Consider the following statements: Moisture should be removed from refrigerants
to avoid
1. Compressor seal failure
2. Freezing at the expansion valve.
3. Restriction to refrigerant flow.
4. Corrosion of steel parts.
Which of these statements are correct?

Solution:
QUESTION: 15

Match List-I (Process) with List-II (Type)for Bell Coleman or Joule or Reverse Brayton cycle
for gas cycle refrigeration and select the correct answer using the codes given below the lists: Solution:  QUESTION: 16

The power per tonne of refrigeration is

Solution:
QUESTION: 17

Which of the following represents a heat pump ?

Solution:
QUESTION: 18

In a petrol engine car, which one of the following performance characteristic is affected by thefront-end volatility gasoline used ?

Solution:
QUESTION: 19

Match List-I (Gas cycles) with List-II (Thermodynamic coordinates) and select correct
answer using the codes given below the lists: Solution:
QUESTION: 20

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.

Solution:
QUESTION: 21

An ideal spark ignition engine has a compression ratio of 9. What is its Air standard efficiency ifratio of specific heats is 1.5 ?

Solution: QUESTION: 22

For minimizing knocking tendency in SI engine, where should the spark plug be located ?

Solution:
QUESTION: 23

Which of the following fuel has little tendency towards detonation ?

Solution:

QUESTION: 24

Stoichiometric ratio is

Solution:

QUESTION: 25

Which of the following form part (s) of boiler mountings ?
1. Economiser
2. Feed check valve
3. Steam trap
4. Superheater

Select the correct answer using the codes given below:

Solution:
QUESTION: 26

Which one of the following statement is not correct ?In a fluidized-bead boiler

Solution:
QUESTION: 27

In a boiler, the air preheater in invariably located between:

Solution:
QUESTION: 28

Out of the following impurities generally found in water, which one requires special considerationin case of very high pressure boilers?

Solution:
QUESTION: 29

The function of economizer in a boiler is to

Solution: QUESTION: 30

When a hydrocarbon fuel burns in deficit air, Orsat analyzer will show the presence offollowing gases in the engine exhaust

Solution:
QUESTION: 31

Once-through boilers will not have

Solution:
QUESTION: 32

The forced circulation of water does not take place in

Solution:
QUESTION: 33

Which of the following are boiler accessories ?

Solution:
QUESTION: 34

The pressure of feed water has to be raised  fore its entry into the boiler. The pressure israised by a device known as

Solution:
QUESTION: 35

In the phenomenon of cavitation, the characteristic fluid property involved is

Solution:
QUESTION: 36

What is the unit of dynamic viscosity of a fluid termed "poise" equivalent to ?

Solution:
QUESTION: 37

The vapour pressure is the characteristic fluid property involved in the phenomenon of

Solution:
QUESTION: 38

In a pipe-flow, pressure is to be measured at a particular cross- section using the most appropriate instrument. Match List-I (Expected pressure range) with List-II (Appropriate measuring device) and select the correct answer using the codes given below the lists:  Solution:
QUESTION: 39

The centre of pressure for an inclined surface area

Solution:
QUESTION: 40

The frictional head loss in a turbulent flow through a pipe varies

Solution:
QUESTION: 41

The friction factor for fully developed turbulent flow through a rough circular pipe depends on

Solution:  QUESTION: 42

The variation in the volume of a liquid with the variation of pressure is called its

Solution:
QUESTION: 43

The atmospheric pressure at sea level is

Solution:
QUESTION: 44

The centre of gravity of the volume of the liquid displaced is called

Solution:
QUESTION: 45

The discharge over a rectangular notch is

where b = width of notch

h = Height of liquid above the sill of notch

Solution:
QUESTION: 46

The unit speed of the turbine runner is

Solution:
QUESTION: 47

The cavitation in a hydraulic machine

Solution:
QUESTION: 48

Fig. shows the three coplanar force P.Q and R acting at a point O. If these forces are in
equilibrium , then Solution:
QUESTION: 49

Moment of inertia is the

Solution:
QUESTION: 50

The friction experienced by a body, when at rest, is known as

Solution:
QUESTION: 51

Which of the following are vector quantities ?

Solution:
QUESTION: 52

The volumetric strain in case of a thin cylindrical shell of diameter 'd', thickness 't', subjected to
internal pressure 'P' is

Solution:
QUESTION: 53

The Poisson ratio of a material which has Young's modulus of 120 GPa and shear modulus of 50GPa, is

Solution: QUESTION: 54

What is the relationship between elastic constants E, G and K?

Solution: QUESTION: 55

Normal stresses of equal magnitude s, but of opposite signs, act at a point of a strained materialin perpendicular direction. What is the magnitude of the stress on a plane inclined at 45º to theapplied stresses ?

Solution: QUESTION: 56

The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is​

Solution:
QUESTION: 57

A seamless pipe of diameter d m is to carry fluid under a pressure of P kN/cm2. The necessary
thickness t of metal in cm, if the maximum stress is not to exceedσ kN/cm2 is

Solution: QUESTION: 58

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 Solution: QUESTION: 59

Modular ratio of the two materials is the ratio of

Solution:
QUESTION: 60

A bar of copper and steel form a composite system, which is heated to a temperature of 40ºC.The stress induced in the copper bar will be

Solution:
QUESTION: 61

The lower layer of the beam as shown fig, will be Solution:
QUESTION: 62

The polar modulus for a hollow shaft of outer diameter (D) and inner diameter (d ) is

Solution:
QUESTION: 63

The load required to produce a unit deflection in a spring is called

Solution:
QUESTION: 64

The centre of gravity of the coupler link in a 4- bar mechanism would experience

Solution:
QUESTION: 65

Which one of the following sets of acceleration is involved in the motion of the piston inside thecylinder of a uniformly rotating cylinder mechanism ?

Solution:
QUESTION: 66

A man is climbing up a ladder up a ladder which is resting against a vertical wall. When he wasexactly half way up, the ladder started slipping . The path traced by the man is :

Solution: QUESTION: 67

ABCD is bar mechanism, in which AD is the fixed link, and link BC, is in the form of a circulardisc with centre P. In which one of the following cases P will be the instantaneous centre of the disc? Solution:
QUESTION: 68

In a single slider four-bar linkage when the slider is fixed, it form a mechanism of

Solution: QUESTION: 69

Which of the following pairs of devices and their functions are correctly matched ?
1. Flywheel : For storing kinetic energy
2. Governors : For controlling speed
3. Lead screw in : For providing feed to the lathe slides
4. Fixtures : For locating work- piece and guiding tools

Select the correct answer using the codes given below:

Solution:
QUESTION: 70

Match List-I (Kinematic pairs) with List-II (Practical example) and select the correct answer
using the code given below the lists:  Solution:
QUESTION: 71

In a cam drive, it is essential to offset the axis of a follower to

Solution:
QUESTION: 72

Which one if the following pairs is correctly matched ?

Solution:
QUESTION: 73

The working surface above the pitch surface of the gear tooth is termed as

Solution:
QUESTION: 74

Stress concentration in a machine component of ductile materials not so harmful as it is in brittlematerial because

Solution:
QUESTION: 75

Consider the following joints:
1. Railway carriage wheel and axle
2. IC engine cylinder and liner
which of the above joints is /are the result (s) of interference fit ?

Solution:
QUESTION: 76

For bolts of uniform strength, the shank diameter is made equal to

Solution:
QUESTION: 77

The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensileor compressive) is called

Solution:
QUESTION: 78

The value of stress concentration factor depends upon

Solution:
QUESTION: 79

The design calculations for members subject to fluctuating loads with the same factor of safety,yield the most conservative estimates when using

Solution:
QUESTION: 80

The design of the pressure vessel is based on

Solution:
QUESTION: 81

Which one of the following is an advantage of forging ?

Solution:
QUESTION: 82

Which of the following statements is correct ?

Solution:
QUESTION: 83

Which one of the following is not a fusion welding process

Solution:
QUESTION: 84

In an inert welding process, the commonly used gas is

Solution:
QUESTION: 85

Solid material chemical bonds are

Solution:
QUESTION: 86

Which one of the following sets if constituents is expected in equilibrium cooling of a hypereutectoid steel from austenitic state ?

Solution:
QUESTION: 87

Primary object of full annealing is to

Solution:
QUESTION: 88

Match List-I (Alloy) with List-II (Use) and select the correct answer using the codes give
below the lists:  Solution:
QUESTION: 89

The most important function of the cutting fluid is

Solution:
QUESTION: 90

Misrun is casting defect which occurs due to

Solution:
QUESTION: 91

Cast iron during machining produces

Solution:
QUESTION: 92

The lip angle is the angle

Solution:
QUESTION: 93

Crater wear occurs mainly on the

Solution:
QUESTION: 94

The cupola is used to manufacture

Solution:
QUESTION: 95

The coordination number of a face centered cubic space lattice is

Solution:
QUESTION: 96

Which of the following statement is wrong?

Solution:
QUESTION: 97

A steel containing ferrite and pearlite is

Solution:
QUESTION: 98

Normalising of steel is done to

Solution:
QUESTION: 99

Brass is an alloy of

Solution:
QUESTION: 100

Babbitt metal contains

Solution: