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Mock Test: SSC JE (ME)- 14

100 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Mock Test: SSC JE (ME)- 14

Description

Attempt Mock Test: SSC JE (ME)- 14 | 100 questions in 100 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Mechanical Engineering SSC JE (Technical) for Mechanical Engineering Exam | Download free PDF with solutions

QUESTION: 1

Molal specific heats of an ideal gas depend on

A.
Its pressure
B.
its temperature
C.
both its pressure and temperature
D.
the number of atoms in a molecule

Solution:

QUESTION: 2

There is no work transfer involved in this process

A.
Adiabatic expansion
B.
Isothermal expansion
C.
Polytropic expansion
D.
Free expansion

Solution:

QUESTION: 3

A carnot engine operates between 27ºC and 327ºC. If the engine produces 300 kj of work,what is the entropy change during heat addition ?

A.
0.5 kJ/K
B.
1.0 kJ/ K
C.
1.5 kJ/K
D.
2.0 kJ/K

Solution:

QUESTION: 4

Three engines A, B and Coperating on Argon, Oxygen and Air respectively. Which engine will have higher efficiency ?

A.
Engine A
B.
Engine B
C.
Engine C
D.
All engines have same efficiency

Solution:

QUESTION: 5

At critical point the enthalpy of vaporization is

A.
dependent on temperature only
B.
maximum
C.
minimum
D.
zero

Solution:

QUESTION: 6

Increase in entropy of a system represents

A.
Increase in availability of energy
B.
Increase in temperature
C.
Decreases in pressure
D.
Degradation of energy

Solution:

QUESTION: 7

The knocking tendency in compression ignition engines increase with

A.
increase of coolant water temperature.
B.
increase of temperature of inlet air.
C.
decrease of compression ratio
D.
increase of compression ratio

Solution:

In SI engine, knocking tendency increases with increase in compression ratio. In CI engine, knocking tendency decreases with increase in compression ratio and vice versa. If compression ratio is low in CI engine, there will not be enough temperature generation for ignition of the fuel air mixture.

QUESTION: 8

The cetane number of automotive diesel fuel used in India is in which one of the following ranges ?

A.
30 – 40
B.
41 – 50
C.
51 – 60
D.
61 – 70

Solution:

QUESTION: 9

The delay period in CI engine depends upon which of the following ?

A.
Temperature ad pressure in the cylinder at the time of injection
B.
Nature of the fuel mixture strength
C.
Relative velocity between the fuel injection and air turbulence pressure of
D.
All of the above.

Solution:

QUESTION: 10

What is the cause of reheat factor in a steam turbine ?

A.
Reheating
B.
Superheating
C.
Supersaturation
D.
Blade friction

Solution:

QUESTION: 11

Blade erosion in steam turbines takes place

A.
Due to high temperature steam
B.
Due to droplets in steam
C.
Due to high rotational speed
D.
Due to high flow rate

Solution:

QUESTION: 12

Mobility of statically indeterminate structure is

A.
≤ – 1
B.
0
C.
1
D.
≥ 2

Solution:

QUESTION: 13

The path of contact in involute gears is

A.
a straight line
B.
involute path
C.
curved line
D.
circle

Solution:

QUESTION: 14

Mitre gears are used for

A.
great speed reduction
B.
transmitting motion between two intersecting shafts
C.
equal speed
D.
minimum axial thrust

Solution:

QUESTION: 15

Bevel gears have their teeth

A.
straight over the wheel rim
B.
inclined to wheel rim
C.
curved over the wheel rim
D.
cut on the surfaces of the frusta of cones

Solution:

QUESTION: 16

Which one of the following governor is widely used in Gramophone

A.
Porter
B.
Pickering
C.
Watt
D.
Wilson hartnell

Solution:

QUESTION: 17

Which of the following are antifriction bearing

A.
sleeve bearing
B.
hydrostatic bearings
C.
ball and roller bearings
D.
None of these

Solution:

QUESTION: 18

Bearing used for heavy loads are

A.
ball bearings
B.
roller bearings
C.
thrust bearings
D.
any of the above

Solution:

QUESTION: 19

Hydrostatic law of pressure is given as

Solution:

QUESTION: 20

A 70 kg person walks on snow with a total foot implant area of 500 cm². What pressure doeshe exert on snow ?

A.
0.5 kPa
B.
12.5 kPa
C.
13.73 kN/m²
D.
137.3 kN/m²

Solution:

QUESTION: 21

The centre of buoyancy is

A.
centre of gravity of the body
B.
point of intersection of the buoyant force and the gravitational force
C.
point of intersection of the buoyant force and the centre line of the body
D.
centre of the volume of the displaced fluid

Solution:

QUESTION: 22

During floods, water entered an office having wooden tables. The position of tables, if floating,will be

A.
legs downwards
B.
legs on sides
C.
legs upwards
D.
any position

Solution:

QUESTION: 23

While using boundary layer equations, Bernoulli's equation

A.
can be used anywhere
B.
can be used only outside the boundary layer
C.
can be used only inside the boundary layer
D.
cannot be used either inside or outside the boundary layer

Solution:

QUESTION: 24

The Euler's equation of motion is a statement of

A.
energy balance
B.
conservation of momentum for an inviscid fluid
C.
conservation of momentum for an incompressible flow
D.
conservation of momentum for a real fluid

Solution:

QUESTION: 25

Which one of the following is measured by a rotameter ?

A.
Velocity of fluids
B.
Discharge of fluids
C.
Viscosity of fluids
D.
Rotational speed of solid shafts

Solution:

QUESTION: 26

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

A.
3
B.
4
C.
21
D.
25

Solution:

QUESTION: 27

The number of elastic constant for a orthotropic material are

A.
2
B.
3
C.
9
D.
21

Solution:

QUESTION: 28

What is the relationship between the linear elastic properties young's modulus (E), rigidity modulus (G) and bulk modulus (K) ?

Solution:

QUESTION: 29

Slenderness ratio is defined as the ratio of

A.
equivalent length of the column to the minimum radius of gyration
B.
length of the column to the minimum radius of gyration
C.
length of the column to the cross section of the column
D.
minimum radius of gyration to the area of cross section of the column

Solution:

QUESTION: 30

The slenderness ratio of a section is

A.
directly proportional to the radius of gyration
B.
directly proportional to the moment of inertia
C.
inversely proportional to the area
D.
inversely proportional to the radius of gyration

Solution:

QUESTION: 31

Euler's formula holds good only for

A.
short columns
B.
long columns
C.
both short and long column
D.
weak columns

Solution:

QUESTION: 32

A thin cylindrical shell of diameter d, length L and thickness t is subjectd to an internal pressure
p. What is the ratio of longitudinal strain to hoop strain in terms of Poission's ratio (1/m) ?

Solution:

QUESTION: 33

The volumetric strain in case of a thin cylindrical shell of diameter d, thickness t, subjected to
internal pressure p is

Solution:

QUESTION: 34

The correct sequence of elements of 18-4=1 HSS tool is

A.
W, Cr, V
B.
Mo, Cr, V
C.
Cr, Ni, C
D.
Cu, Zn, Sn

Solution:

QUESTION: 35

In relation VTⁿ= C, the value of n, for ceramic tools

A.
0.15 to 0.25
B.
0.4 to 0.55
C.
0.6 to 0.75
D.
0.8 to 0.9

Solution:

QUESTION: 36

Ceramic cutting tool chip are fixed to the tool body by

A.
Clamping
B.
Welding
C.
Soldering
D.
Brazing

Solution:

QUESTION: 37

Bolt heads are manufactured by

A.
Swagging
B.
Roll forging
C.
Tumbiling
D.
Upset forging

Solution:

QUESTION: 38

Generally the value of point angle of a drill is

A.
70º
B.
100º
C.
118º
D.
130º

Solution:

QUESTION: 39

The different speeds on lathe are provided in

A.
arithmetic progression
B.
geometric progression
C.
harmonic progression
D.
none of these

Solution:

QUESTION: 40

The two parts of a sand casting mould are called

A.
Gate and sprue
B.
Upper and drag
C.
Cope and drag
D.
Cope and bottom

Solution:

QUESTION: 41

Fluidity is greatly influenced by

A.
Carbon content in molten metal
B.
Pouring temperature of molten metal
C.
inoculation added
D.
None of these

Solution:

QUESTION: 42

In D.C. reverse polarity arc welding

A.
the W.P is made positive and electrode is made negative
B.
the W.P is made negative and electrode is made positive
C.
both the W.P and electrode are made positive
D.
both the W.P and electrode are made negative

Solution:

QUESTION: 43

In which of the following welding techniques in vacuum environment required

A.
Ultrasonic welding
B.
Laser beam welding
C.
Plasma arc welding
D.
Electron beam welding

Solution:

QUESTION: 44

Which one of the following welding processes consists of minimum heat affected zone

A.
Shielded metal Arc Welding (SMAW)
B.
Laser beam welding (LBW)
C.
Ultra sonic welding (USW)
D.
Metal Inert Gas welding (MIG)

Solution:

QUESTION: 45

Which one of the following is not an electric resistance method of welding

A.
electro slag welding
B.
percussion welding
C.
seam welding
D.
flash welding

Solution:

QUESTION: 46

A medium carbon steel workpiece is turned on a lath at 50 m/ min cutting speed, 0.8 mm/ revfeed and 1.5 mm depth of cut, what is the rate of metal removal

A.
100 mm³/ min
B.
20000 mm³/min
C.
60000 mm³/ min
D.
Can not be calculated with the given data

Solution:

QUESTION: 47

In a typical metal cutting operation, using a cutting tool of positive rake a = 10º. It was observed that the shear angle was 20º the friction angle is

A.
45º
B.
30º
C.
60º
D.
40º

Solution:

QUESTION: 48

Primary tool force used in calculating the total power consumption in machining is

A.
Radial force
B.
Tangential force
C.
Axial force
D.
Frictional force

Solution:

QUESTION: 49

When the molten metal is poured in a mould, it may pass through the following items in sequence

A.
Sprue, runner, gate, top rise
B.
Runner, sprue, gate, top riser
C.
Top riser, runner, sprue, gate
D.
Gate, sprue, top riser, runner

Solution:

QUESTION: 50

A trepanning tool is used on

A.
Milling machine
B.
Lathe
C.
Universal cylindrical grinder
D.
Jig boring machine

Solution:

QUESTION: 51

In solidification of metal during casting, compensation for solid contraction is

A.
provided by the oversize pattern
B.
achieved by property placed risers
C.
obtained by promoting directional solidification
D.
made by providing chills

Solution:

QUESTION: 52

When trying to turn a key into a lock, following is applied

A.
Lever
B.
Moment
C.
Couple
D.
Coplanar force

Solution:

QUESTION: 53

Properties of substances like pressure, temperature and density , in thermodynamic coordinates are

A.
path functions
B.
point function
C.
cyclic functions
D.
real functions

Solution:

QUESTION: 54

A perpetual motion machine is

A.
a thermodynamic machine
B.
a non-thermodynamic machine
C.
a hypothetical machine whose operation would violate the laws of thermoynamics
D.
a hypothetical machine

Solution:

QUESTION: 55

Air refrigerators work on

A.
Carnot cycle
B.
Otto cycle
C.
Atkinson cycle
D.
Reversed joule cycle

Solution:

QUESTION: 56

Second law of thermodynamics defines

A.
entropy
B.
enthalpy
C.
heat
D.
work

Solution:

QUESTION: 57

An isentropic process on T-S diagram is represented by a

A.
horizontal line
B.
vertical line
C.
inclined line
D.
curved line

Solution:

QUESTION: 58

The area under curve on T-S diagram represents the

A.
heat transfer for all processes
B.
heat transfer for adiabatic processes
C.
heat transfer for reversible processes
D.
heat transfer for irreversible processes

Solution:

QUESTION: 59

Dynamic viscosity (m) has the dimensions as

Solution:

QUESTION: 60

The co-efficient of discharge (C_d) in terms of C_v and C_c is

A.
B.
C.
D.
none of these

Solution:

QUESTION: 61

For viscous flow between two parallel plates, the pressure drop per unit length is equal to

Solution:

QUESTION: 62

Total energy line (T.E.L) represents the sum of

A.
pressure head and datum head
B.
kinetic head and datum head
C.
pressure head, kinetic head and datum head.
D.
None of the above

Solution:

QUESTION: 63

Hydraulic gradient line (H.G. L.) represents the sum of

A.
pressure head and kinetic head
B.
kinetic head and datum head
C.
pressure head, kinetic head and datum head
D.
pressure head and datum head

Solution:

QUESTION: 64

The loss of head due to sudden contraction of a pipe is equal to

A.
B.
C.
D.
none of these

Solution:

QUESTION: 65

The property of a material by virtue of which a body returns to its original shape after removal of the load is called

A.
plasticity
B.
elasticity
C.
ductility
D.
malleability

Solution:

QUESTION: 66

The ratio of direct stress to volumetric strain in case of a body subjected to three mutually perpendicular stresses of equal intensity, is equal to

A.
young's modulus
B.
bulk modulus
C.
modulus of rigidity
D.
modulus of elasticity

Solution:

QUESTION: 67

The dimension of young's modulus of elasticity is given by

Solution:

QUESTION: 68

Match the items in columns I and II

A.
P-2,Q-6, R-4, S-3
B.
P-6, Q-2, R-4, S-1
C.
P-6, Q-2, R-5, S-3
D.
P-2, Q-6, R-5, S-1

Solution:

QUESTION: 69

There are two points P and Q on a planar rigid body. The relative velocity between the two points

A.
Should always be perpendicular to PQ
B.
can be oriented along any direction
C.
Should always be along PQ
D.
Should be along QP

Solution:

QUESTION: 70

In the figure shown, the relative velocity of link 1 with respect of link 2 is 12m/ sec. Link 2 rotates at a constant speed of 120 rpm. The magnitude of Coriolis component of acceleration of link 1 is

A.
302 m/s2
B.
604 m/s2
C.
906 m/s2
D.
1208 m/s2

Solution:

QUESTION: 71

Axial thrust is minimum in case of

A.
spur gears
B.
double helical gears
C.
bevel gears
D.
mitre gears

Solution:

QUESTION: 72

Gearing contact is which one of the following ?

A.
sliding contact
B.
Sliding contact, only rolling at pitch point
C.
Rolling contact
D.
Rolling and sliding at each point of contact

Solution:

QUESTION: 73

If the two pulleys in a belt drive have different values of coefficient of friction, then the design will be based on the pulley for which

A.
mq is maximum
B.
mq is minimum
C.
mq = 1
D.
mq > 1

Solution:

QUESTION: 74

Alloy containing Tin is

A.
Gun metal
B.
Phosphorous bronze
C.
White metal
D.
All of the above

Solution:

QUESTION: 75

The ductility of a material with work hardening

A.
increases
B.
decreases
C.
remains unaffected
D.
unpredictable

Solution:

QUESTION: 76

Which among the following is slowest speed operation in lathe

A.
Turning
B.
Thread cutting
C.
Taper turning
D.
knurling

Solution:

QUESTION: 77

Soft materials can not be economically grinded due to

A.
the higher temperature involved
B.
frequent wheel clogging
C.
rapid wheel wear
D.
low work piece stiffness

Solution:

QUESTION: 78

Feed rate in milling operation is expressed as

A.
mm/tooth
B.
mm/rev of milling cutter
C.
meters/ min
D.
mm

Solution:

QUESTION: 79

The machining process which makes a stepped cylindrical recess at the top of a hole to accommodate bolt head is called

A.
Counter boring
B.
Countersinking
C.
Die- sinking
D.
Taper turning

Solution:

QUESTION: 80

Internal and external threads of different pitches can be produced by

A.
pantograph milling machine
B.
profiling machine
C.
planetary milling machine
D.
plano miller

Solution:

QUESTION: 81

The casting defect which is not caused by the high pouring temperature of melt is

A.
cuts
B.
metals penetration
C.
fusion
D.
Rat tails

Solution:

QUESTION: 82

The impurities in true centrifugal casting

A.
get collected at outer surface
B.
mix up thoroughly throughout
C.
get collected at the inner surface
D.
get collected in the middle portion in between inner and outer surface

Solution:

QUESTION: 83

In a gas welding of mild steel using an neutral flame the total amount of acetylene consurmed is 10 litre. the oxygen consumption is

A.
5 lit
B.
10 lit
C.
15 lit
D.
20 lit

Solution:

QUESTION: 84

Pinch effect in welding is the result of

A.
expansion of gases in the arc
B.
electro magnetic forces
C.
electric force
D.
surface tension of the molten metal

Solution:

QUESTION: 85

The maximum heat in resistance welding is at the

A.
Tip of the positive electrode
B.
Tip of negative electrode
C.
Top surface of the plate at the time of electriccontact with the electrode
D.
Interface between the two plates being joined

Solution:

QUESTION: 86

If a i is the rake angle of the cutting tool f is the shear angle and V is the cutting velocity, velocity of chip sliding along the shear plane is given by

Solution:

QUESTION: 87

The size of inlet valve of an engine in comparison to exhaust valve is

A.
more
B.
less
C.
same
D.
more/less depending on capacity of engine

Solution:

QUESTION: 88

The domestic refrigerator uses following type of compressor

A.
centrifugal
B.
axial
C.
miniature sealed unit
D.
piston type reciprocating

Solution:

QUESTION: 89

The adiabatic equation of a perfect gas is

Solution:

QUESTION: 90

The forces which meet at one point, but their lies of action do not lie in a plane are called

A.
coplanar non-concurrent force
B.
non- coplanar concurrent force
C.
non- coplanar non- concurrent forces
D.
intersecting forces

Solution:

Concurrent Non coplanar forces

Ø In this system, all forces do not lie in the same plane, but their line of action passes through a single point ( O ).

Ø Any two forces of a concurrent force system determine a plane, their resultant is determined by parallelogram law.

QUESTION: 91

A perfact gas

A.
has constant viscosity
B.
has zero viscosity
C.
is incompressible
D.
none of the above

Solution:

QUESTION: 92

The buoyancy depends on

A.
mass of liquid displaced
B.
viscosity of the liquid
C.
pressure of the liquid displaced
D.
depth of immersion

Solution:

QUESTION: 93

Euler's dimensionless number relates the following

A.
inertial force and gravity
B.
viscous force and inertial force
C.
viscous force and buoyancy force
D.
pressure force and inertial force

Solution:

QUESTION: 94

Liquids transmit pressure equally in all the directions. This is according to

A.
Boyle's law
B.
Archimedes principle
C.
Pascal's law
D.
newton's formula

Solution:

QUESTION: 95

Centre of pressure compared to c.g. is

A.
above it
B.
below it
C.
at same point
D.
above or below depending on area of body

Solution:

QUESTION: 96

Flow of water in a pipe about 3 metres in diameter can be measured by

A.
orifice plate
B.
venturi
C.
rotameter
D.
pitoto tube

Solution:

QUESTION: 97

The equation of continuity of flow is based on the principle of conservation of

A.
flow
B.
mass
C.
momentum
D.
energy

Solution:

QUESTION: 98

The length of divergent portion of ventrumeter in comparison to convergent portion is

A.
same
B.
more
C.
less
D.
more or less depeneding on capacity

Solution:

QUESTION: 99

The intensity of stress which causes unit strain is called

A.
unit stress
B.
bulk modulus
C.
modulus of rigidity
D.
modulus of elasticity

Solution:

QUESTION: 100

True stress- strain curve for materials is plotted between

A.
load/ original cross-sectional area and
change in length/ original length
B.
C.
load/ instantaneous cross-sectional area and change in length / original length
D.
load/ instantaneous area and instantaneous area/ original area