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Test: Mechanical Engineering- 12

100 Questions MCQ Test Mock Test Series for SSC JE Mechanical Engineering | Test: Mechanical Engineering- 12

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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

Entropy may be expressed as a function of

A.
pressure and temperature
B.
temperature and volume
C.
heat and work
D.
all of above

Solution:

QUESTION: 2

Which of the following is not a conserved quantity ?

A.
Mass
B.
Energy
C.
Momentum
D.
Exergy

Solution:

QUESTION: 3

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

A.
Low temperature and low pressure
B.
Low temperature and high pressure
C.
Low temperature and a catalyst
D.
High temperature and low pressure

Solution:

QUESTION: 4

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

Solution:

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

A.
Monoatomic gases
B.
Diatomic gases
C.
Real gases
D.
Ideal gases

Solution:

QUESTION: 7

In thermodynamics analysis, a pure substance is that which

A.
has no dissolved impurities
B.
consists of only a single species
C.
may have a number of chemical species butthe composition remains constant
D.
behaves as a perfect gas

Solution:

QUESTION: 8

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

A.
Zeroth law of thermodynamics
B.
First law of thermodynamics
C.
Second law of thermodynamics
D.
none of these

Solution:

QUESTION: 9

The behaviour of super heated vapour is similar to that of

A.
perfect gas
B.
air
C.
steam
D.
ordinary gas

Solution:

QUESTION: 10

According to Avogadro's law

A.
the product of the gas constant and the molecular mass of an ideal gas is constant
B.
the sum of partial pressure of the mixture oftwo gases is sum of the two
C.
equal volumes of all gases, at the same temperature and pressure, contain equalnumber of molecules
D.
all of the above

Solution:

QUESTION: 11

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

A.
flow processes
B.
non-flow processes
C.
adiabatic processes
D.
none of these

Solution:

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

A.
isothermal process
B.
hyperbolic process
C.
adiabatic process
D.
polytropic process

Solution:

QUESTION: 13

One tonne refrigerator machine means that

A.
one tonne is the total mass of machine
B.
one tonne of refrigerator is used
C.
one tonne of water can be converted on toice.
D.
One tonne of ice when melts form and at 0ºC in 24 hours, the refrigerating effect produced is equivalent to 210 kJ/min.

Solution:

QUESTION: 14

Air refrigeration cycle is generally employed in

A.
Domestic refrigerators
B.
Commercial refrigerators
C.
Air-conditioning
D.
Gas liquefaction

Solution:

QUESTION: 15

Which is usually the costliest item in a refrigeration system ?

A.
Condenser
B.
Capillary tube
C.
Compressor
D.
Evaporator

Solution:

QUESTION: 16

The relative coefficient of performance is equal to

A.
B.
C.
D.
none of these

Solution:

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 ?

A.
120
B.
180
C.
240
D.
300

Solution:

QUESTION: 18

The top of the piston in two-stroke engine is

A.
flat
B.
slanted
C.
crown shaped
D.
convex shaped

Solution:

QUESTION: 19

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

A.
more uniform torque on the crankshaft
B.
more power output for the cylinder of same dimensions
C.
absence of valves
D.
all of the above

Solution:

QUESTION: 20

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

A.
6-10
B.
16-20
C.
16-25
D.
25-40

Solution:

QUESTION: 21

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

A.
an increase in thermal efficiency but a decrease in mean effective pressure
B.
a decrease in thermal efficiency but an increase in mean effective pressure
C.
a decrease in thermal efficiency and mean effective pressure
D.
an increase in thermal efficiency and mean effective pressure

Solution:

QUESTION: 22

For the same peak pressure and work output

Solution:

QUESTION: 23

In a four stroke cycle petrol engine, the expansion

A.
starts at top dead centre and ends at bottom dead centre
B.
starts at 30º before top dead centre and ends at 50º before bottom dead centre
C.
starts at 30º after top dead centre and end sat 50º after bottom dead centre
D.
may start and end anywhere

Solution:

QUESTION: 24

The spark ignition engines are governed by

A.
hit and miss governing
B.
quantitative governing
C.
qualitative governing
D.
combination of (b) and (c)

Solution:

QUESTION: 25

In thermal power plants, the dearator is used mainly to

A.
remove air from condenser
B.
increase feed water temperature
C.
reduce steam pressure
D.
remove dissolved gases from free water

Solution:

QUESTION: 26

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

A.
Electostatic level of pollution?
B.
Draught fan
C.
Chimney
D.
Dearator

Solution:

QUESTION: 27

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

A.
Condenser
B.
Economiser
C.
Air preheater
D.
Feed water pump

Solution:

QUESTION: 28

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

A.
rectangular
B.
square
C.
circular
D.
elliptical

Solution:

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

A.
a
B.
b
C.
c
D.
d

Solution:

QUESTION: 30

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

Solution:

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

A.
to give maximum space and strength
B.
to withstand the pressure of steam inside the boiler
C.
both (a) and (b)
D.
none of the above

Solution:

QUESTION: 33

Which of the following statement is wrong?

A.
Locomotive boiler is a water tube boiler
B.
Water tube boiler are internally fired.
C.
La-mont boiler is a low pressure water tube boiler
D.
all of the above

Solution:

QUESTION: 34

Blow off cock in a boiler is used to

A.
control the flow of steam from the boiler to the main pipe and to shut off the steam completely when require
B.
empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
C.
put off fire in the furnace of the boiler when the level of water in the boiler falls to anunsafe limit
D.
increase the temperature of saturated steam without raising its pressure

Solution:

QUESTION: 35

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

A.
increases
B.
decreases
C.
unaltered
D.
lower/higher depending on weight of body

Solution:

QUESTION: 36

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

A.
energy
B.
work
C.
length
D.
pressure

Solution:

QUESTION: 37

The turbulent flow has

A.
streakline motion
B.
parabolic velocity distribution
C.
random orientation of fluid particles
D.
small slope of velocity profile at the wall

Solution:

QUESTION: 38

The logarithmic velocity distribution is observed in

A.
open channel flow
B.
laminar boundary layer
C.
turbulent boundary layer
D.
laminar boundary layer over a flat plate

Solution:

QUESTION: 39

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

Solution:

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

A.
A
B.
B
C.
C
D.
D

Solution:

QUESTION: 42

The Bernoulli's equation is based on the assumption that

A.
there is no loss of energy of the liquid flowing
B.
the velocity of flow is uniform across any cross -section of the pipe
C.
no force except gravity acts on the fluid
D.
all of the above

Solution:

QUESTION: 43

The discharge through an external mouthpiece is given by

Solution:

QUESTION: 44

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

A.
Pressure head
B.
velocity head
C.
pressure head = velocity head
D.
pressure head – velocity head

Solution:

QUESTION: 45

The viscosity of water at 20º C is

A.
one stoke
B.
one centistroke
C.
one poise
D.
one centipoise

Solution:

QUESTION: 46

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

A.
real fluid
B.
ideal fluid
C.
newtonian fluid
D.
non-newtonian fluid

Solution:

QUESTION: 47

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

A.
real fluid
B.
ideal fluid
C.
newtonian fluid
D.
non-newtonian fluid

Solution:

QUESTION: 48

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

A.
deflection change sign
B.
beam develops crack
C.
radius of curvature changes sign
D.
shear force is maximum

Solution:

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

A.
in pure bending
B.
in pure shear
C.
having maximum bending moment
D.
having maximum shear force

Solution:

QUESTION: 50

At the neutral axis of simply beam, there is

A.
maximum tensile stress
B.
maximum compressive stress
C.
zero bending stress
D.
stress developed which depends upon type of loading

Solution:

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

Solution:

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

A.
60
B.
50
C.
30
D.
20

Solution:

QUESTION: 53

At a principal plane

A.
not stress exists
B.
only uniaxial stress acts
C.
the normal stress is maximum or minimum and the shear stress is zero
D.
the tensile stress is zero and the shear stress in maximum

Solution:

QUESTION: 54

Maximum shear stress in a Mohr's circle

A.
is equal to radius of Mohr's circle
B.
is greater than radius of Mohr's circle
C.
is less than radius of Mohr's circle
D.
Could be any of the above

Solution:

QUESTION: 55

The maximum principal stress theory is also known as

A.
Beltrami's theory
B.
St. Venant's theory
C.
Rankine's theory
D.
Von Mises theory

Solution:

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

A.
1/3
B.
2/3
C.
1
D.
3/2

Solution:

QUESTION: 58

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

A.
equal to
B.
less than
C.
directly proportional to
D.
inversely proportional to

Solution:

QUESTION: 59

A beam extending beyond the supports is called

A.
simply supported beam
B.
fixed beam
C.
overhanging beam
D.
continuous beam

Solution:

QUESTION: 60

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

A.
w/r
B.
w.r
C.
w²/r
D.
w²r

Solution:

QUESTION: 61

The periodic time (T) is given by

A.
w/2p
B.
2p/w
C.
p/w
D.
None of the above

Solution:

QUESTION: 62

A pendulum which executes one beat per second is known as

A.
second's pendulum
B.
compound pendulum
C.
torsional pendulum
D.
simple pendulum

Solution:

QUESTION: 63

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

A.
weight of the vehicle
B.
(velocity)² of the vehicle
C.
nature of the road surface
D.
coefficient of friction between the road and vehicle contact point

Solution:

QUESTION: 64

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

A.
Cotter joint
B.
Knuckle joint
C.
Ball joint
D.
Universal joint

Solution:

QUESTION: 65

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

A.
a
B.
b
C.
c
D.
d

Solution:

QUESTION: 66

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

A.
heat treatment
B.
grinding and lapping the surface
C.
electroplating
D.
polishing

Solution:

QUESTION: 67

In cyclic loading, stress concentration is more serious in

A.
brittle as well as ductile materials
B.
brittle materials
C.
ductile materials
D.
elastic materials

Solution:

QUESTION: 68

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

A.
longitudinal stress
B.
circumferential stress
C.
shear stress
D.
none of these

Solution:

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

A.
d = t
B.
d = 1.6√ t
C.
d = 2t
D.
d = 6√ t

Solution:

QUESTION: 70

The efficiency of a riveted joint is equal to

Solution:

QUESTION: 71

The difference between addendum and dedendum is known as

A.
Backlash
B.
Clearance
C.
Flank
D.
Tooth space

Solution:

QUESTION: 72

Train value of a gear train is

A.
equal to speed ratio
B.
half of speed ratio
C.
reciprocal of speed ratio
D.
double the speed ratio

Solution:

QUESTION: 73

Which of the following machines does not require a flywheel ?

A.
Punching machine
B.
Lathe
C.
Reverting machine
D.
Steam engine

Solution:

QUESTION: 74

A Hartnell governor is a governor of the

A.
inertia type
B.
pendulum type
C.
centrifugal type
D.
dead weight type

Solution:

QUESTION: 75

Sensitivity of an isochronous governor is

A.
zero
B.
one
C.
two
D.
infinite

Solution:

QUESTION: 76

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

A.
zero
B.
variable depending upon the load
C.
maximum
D.
minimum

Solution:

QUESTION: 77

Which one of the following causes whirling of shafts?

A.
non-homogeneity of shaft material
B.
misalignment of bearings
C.
fluctuation of speed
D.
internal damping

Solution:

QUESTION: 78

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

A.
turning only
B.
sliding only
C.
rolling only
D.
partly turning and partly sliding

Solution:

QUESTION: 79

An automobile steering gear is an example of

A.
sliding pair
B.
rolling pair
C.
lower pair
D.
higher pair

Solution:

QUESTION: 80

In a steam engine, the link constitutes a

A.
piston, piston rod and crosshead
B.
connecting rod with big and small end brasses, caps and bolts
C.
crank pin, crankshaft and flywheel
D.
all of the above

Solution:

QUESTION: 81

Cores are used in the casting to

A.
strengthen moulding sand
B.
to produce directional solidification
C.
to produce hollow portion in casting
D.
to remove pattern easily

Solution:

QUESTION: 82

Cold shut (lap) may occur in products obtained by

A.
Casting
B.
Forging
C.
Machining
D.
Welding

Solution:

QUESTION: 83

Collapsible tooth paste tubes are manufactured by

A.
Direct extrusion
B.
Piercing
C.
Impact extrusion
D.
Indirect extrusion

Solution:

QUESTION: 84

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

A.
18% W, 4% Cr, 1% V
B.
18% Cr, 4% W, 1% V
C.
18% W, 4% Ni, 1% V
D.
18% Cr, 4% Ni, 1% V

Solution:

QUESTION: 85

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

A.
Side milling
B.
plain milling
C.
face milling
D.
Straddle milling

Solution:

QUESTION: 86

The purpose of reaming is

A.
for making a hole initially
B.
to enlarge the diameter of the hole
C.
to improve the finish of the hole
D.
to achieve correct diameter

Solution:

QUESTION: 87

Grey cast iron is usually welded by

A.
Gas welding
B.
Resistance welding
C.
Arc welding
D.
TIG welding

Solution:

QUESTION: 88

The temperature of plasma torch is of the order is

A.
100 ºC
B.
5000 ºC
C.
10000 ºC
D.
33000ºC

Solution:

QUESTION: 89

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

A.
Brass
B.
Mild steel
C.
Bronze
D.
Stainless steel

Solution:

QUESTION: 90

The temperature of the heat produced by an arc is around

A.
6500º F
B.
6500 ºC
C.
3000 ºC
D.
10000 ºC

Solution:

QUESTION: 91

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

A.
mainly pearlite
B.
mainly ferrite
C.
ferrite and pearlite
D.
pearlite and cementite

Solution:

QUESTION: 92

When the steel is normalised, its

A.
yield point increases
B.
ductility decreases
C.
ultimate tensile strength increases
D.
all of these

Solution:

QUESTION: 93

Which of the following is a case hardening process?

A.
Carburising
B.
Cyaniding
C.
Nitriding
D.
all of these

Solution:

QUESTION: 94

Induction hardening is basically a

A.
carburising process
B.
surface hardening process
C.
core-hardening process
D.
none of these

Solution:

QUESTION: 95

In oblique cutting system, the cutting edge of the tool

A.
may clear the width of the workpiece
B.
may or may not clear the width of the workpiece
C.
may not clear the width of the wokpiece
D.
should always clear the width of the workpiece

Solution:

QUESTION: 96

Ceramic tools are fixed to tool body by

A.
soldering
B.
brazing
C.
welding
D.
clamping

Solution:

QUESTION: 97

The tool life is affected by

A.
depth of cut
B.
cutting speed
C.
feed
D.
all of these

Solution:

QUESTION: 98

Tool life is generally better when

A.
grain size of the metal is large
B.
grain size of the metal is small
C.
hard constituents are present in the microstructure of the tool material
D.
none of the above

Solution:

QUESTION: 99

Which of the following operation is first performed ?

A.
Spot
B.
Boring
C.
Tapping
D.
Drilling

Solution:

QUESTION: 100

In drilling brass, a drill with

A.
zero helix angle is used
B.
low helix angle is used
C.
high helix angle is used
D.
any helix angle can be used

Solution:

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100 Questions MCQ Test Mock Test Series for SSC JE Mechanical Engineering | Test: Mechanical Engineering- 12

Entropy may be expressed as a function of

Which of the following is not a conserved quantity ?

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

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