Test: Mechanical Engineering- 7


100 Questions MCQ Test Mock Test Series for SSC JE Mechanical Engineering | Test: Mechanical Engineering- 7


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This mock test of Test: Mechanical Engineering- 7 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 100 Multiple Choice Questions for Mechanical Engineering Test: Mechanical Engineering- 7 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Mechanical Engineering- 7 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Test: Mechanical Engineering- 7 exercise for a better result in the exam. You can find other Test: Mechanical Engineering- 7 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

The moment diagram for a centilever beam carrying uniformly distributed load will be

Solution:
QUESTION: 2

The moment diagram for a cantilever beam carrying concentrated load at end of the beam will be

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QUESTION: 3

Turbine is tripped when the

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QUESTION: 4

Diesel fuel, compared to petrol is

Solution:

Diesel is in principle easier to refine than gasoline, however it contains more pollutants that must be extracted before it can reach the same levels of emissions as petrol. Per litre, diesel contains more energy than petrol and the vehicle’s engine combustion process is more efficient, adding up to higher fuel efficiency and lower CO2 emissions when using diesel.

QUESTION: 5

The rollers of a cycle chain are subjected to following type of stress

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QUESTION: 6

Two sheets of same material but different thickness can be butt welded by

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QUESTION: 7

In arc welding operations the current value is decide by

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QUESTION: 8

Neutral flame has

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QUESTION: 9

Sands are graded according to their

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QUESTION: 10

If V is the volume of metal in a casting and A its surface area, then time of solidification will be
proportional to

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QUESTION: 11

As the size of castings increases, it is often better to use increasingly

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QUESTION: 12

The usual ratio of forward and return stroke in shaper is

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QUESTION: 13

Match List-I with List-II and select correct answer using the codes given below the lists:

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QUESTION: 14

Match List-I (Elastic properties of an isotropic elastic material) with List-II (Nature of strain
produced ) and select the correct answer using the codes given below the lists:

 

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QUESTION: 15

A long column fails by

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QUESTION: 16

Match List-I with List-II and select correct answer using the codes given below the lists:

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QUESTION: 17

A tapering bar (diameters of end sections being d1 and d2) and a bar of uniform cross section 'd' have the same length and are subjected the same axial pull. Both the bars will have the same extension if 'd' is equal to

Solution:

E = Stress / Strain = WL / ΔL A
For a tapering rod,
A = π d1 d2 / 4
ΔL = 4WL / π d1 d2 E
For a uniform cross section with diameter d,
A = π d2 / 4
 ΔL = 4WL / π d2 E

The bars have the same length l and are subjected to the same axial pull W. Then for the same extension ΔL
4WL / π d1 d2 E = 4WL / π d2 E
1/ d1d2 = 1/ d2
so d = 

QUESTION: 18

A spring of stiffness 1000 N/m is stretched initially by 10 cm from the underformed position.The work required to stretch it by another 10 cm is

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QUESTION: 19

In planetary motion, following parameter remains constant

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QUESTION: 20

The moment of inertia does not depend upon

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QUESTION: 21

When a body falls freely under gravitational force it possesses

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QUESTION: 22

Francis, kaplan and propeller turbines fall under the category of

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QUESTION: 23

Reaction turbines are used for

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QUESTION: 24

In a static fluid

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QUESTION: 25

For a mechanism shown below, the mechanical advantage for the given configuration is

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QUESTION: 26

The directions of Coriolis component of acceleration, 2wV, of the slider A with respact
to the coincident point B is shown in figure 1, 2, 3 and 4. Directions shown by figures

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QUESTION: 27

Which one of the following drives is used for a constant velocity ratio, positive drive with large centre distance, between the driver and driven shafts ?

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QUESTION: 28

Which type of gears are used for shaft axes having an offset ?

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QUESTION: 29

In a governor, if the equilibrium speed is constant for all radii of rotation of balls, the governor is said to be

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QUESTION: 30

Centrifugal tension in belts is

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QUESTION: 31

Given that T1 and T2 are the tensions on the tight and slack of the belt respectively, the initial
tension of the belt taking centrifugal tension Tc is equal to

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QUESTION: 32

Which one of the following statement is correct?

In case of clutches, the uniform pressure theory:

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QUESTION: 33

The maximum efficiency of Pelton turbine is _________

Solution:

We know that efficiency will be Maximumwhen blade velocity is equal to half of its jet velocity upon substitution we get efficiency as 50%.

QUESTION: 34

Pseudo- plastic substances are non- Newtonian fluids for which

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QUESTION: 35

For small discharge at high pressure following pump is preferred:

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QUESTION: 36

Head developed by a centrifugal pump depends on :

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QUESTION: 37

A streamlined body is such that :

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QUESTION: 38

Shear stress in a turbulent flow is due to

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QUESTION: 39

The discharge through a single acting reciprocating pump is [N® rpm]

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QUESTION: 40

For helical gears, the helix angle generally ranges from

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QUESTION: 41

Degree of freedom of a slider crank mechanical is

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QUESTION: 42

The differential gear in the automobiles is used to

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QUESTION: 43

Which of the following gear system have minimum axial thrust ?

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QUESTION: 44

For a screw, the angle of helix (a) is related to the lead (L) and mean screw thread diameter
(d) as :

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QUESTION: 45

In wheel and differential axle, the velocity ratio is given by :

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QUESTION: 46

Figures A, B, C and D are bending moment distributions of a simply supporteed beam for
some particular shear stress distribution. Which figure is the correct bending moment diagram
corresponding to the shear stress distribution given below:

Solution:
QUESTION: 47

The power transmitted by a circular shaft rotating at N rpm under action of Torque T is :

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QUESTION: 48

The circumferential stress in a thin shell due to internal fluid pressure is given by

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QUESTION: 49

Which of the following is not a foundry tool ?

Solution:
QUESTION: 50

Filler metal is used in

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QUESTION: 51

Hot working of metal is carried out

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QUESTION: 52

Cupola is best suited for melting

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QUESTION: 53

In case of slotting machine, cutting action takes place in

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QUESTION: 54

In which type of welding molten metal is poured for joining the metals ?

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QUESTION: 55

In a single V- butt welds, the angle between edges is kept about

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QUESTION: 56

Permeability of a foundry sand is

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QUESTION: 57

A half nut is :

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QUESTION: 58

Automobile gears are generally manufactured by:

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QUESTION: 59

The binder in case of synthetic sand used for moulding is :

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QUESTION: 60

The diameter of core of a circular section is given as :

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QUESTION: 61

The time period of oscillation of a floating body

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QUESTION: 62

The viscosity of water with respect to air is about:

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QUESTION: 63

A column has a rectangular cross-section of 10 × 20 mm and a length of 1m. The slenderness ratio of the column is close to

Solution:

Slenderness ratio (λ)

QUESTION: 64

If the principle stresses in a plane stress problem are s1 = 100 MPa, s2= 40 MPa, the magnitude of the maximum shear stress (in MPa) will be

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QUESTION: 65

Of the following, which is more practical in case of I.C. engine (Diesel) :

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QUESTION: 66

The critical temperature for water is :

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QUESTION: 67

During machining, excess metal is removed inthe form of chip as in the case of turning on alathe.

Which of the following are correct ?

Continuous ribbon like chip is formed whenturning

1. At a higher cutting speed

2. At a lower cutting speed

3. A brittle material

4. A ductile material

Select the correct answer using the code givenbelow:

Solution:
QUESTION: 68

Which one of the following is the correct expression for the merchant's machinability
constant ?

Solution:
QUESTION: 69

In strain gauge dynamomenters the use of how many active gauge makes the dynamometers more effective.

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QUESTION: 70

The commonly used angle between the cone surface and horizontal axis for a cone clutch utilising leather factor to asbestos lining is about

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QUESTION: 71

The discharge through a rectangular notch is given by

Solution:
QUESTION: 72

The discharge through a trapezoidal notch is given as

Where q/2 = Slope of the side of the trapezoidal notch.

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QUESTION: 73

The discharge over a rectangular notch considering velocity of approach is given as

Solution:
QUESTION: 74

A reversible heat engine operating between hot and cold reservoirs delivers a work output of 54 kJ while it rejects a heat of 66 kJ. the efficiency of this engine is :

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QUESTION: 75

If a heat engien gives an output of 3 kW when the input is 10,000 J/s, then the thermal efficiency of the engine will be :

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QUESTION: 76

In a thermodynamic cycle consisting of four processes, the heat and work are as follows:

Q : + 30, – 10, – 20, + 5

W: +3, 10, – 8, 0

The thermal efficiency of the cycle will be:

Solution:
QUESTION: 77

Four columns of same material and same length are of rectangular cross-section of same breadth 'b'. The depth of the cross-section and the end conditions are however different are given as follows:

Which of the above columns Euler buckling load maximum ?

Solution:
QUESTION: 78

The property by which an amount of energy is absorbed by a material without plastic deformation, is called:

Solution:
QUESTION: 79

The bending moment diagram for the case shown below will be as shown in

Solution:
QUESTION: 80

The unit of surface tension is :

Solution:
QUESTION: 81

The shear stress developed in lubricating oil of viscosity 9.81 poise filled between two parallelplates 1 cm a part and moving with relative velocity of 2m/s is

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QUESTION: 82

If the angle of drop of liquid is acute then:

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QUESTION: 83

A toothpaste tube can be produced by

Solution:
QUESTION: 84

MIG welding process uses

1. Consumable electrode

2. Non- consumable electrode

3. D.C. power supply

4. A.C. power supply

Which of these statement are correct ?

Solution:
QUESTION: 85

In Oxy-acetelene gas welding, for complete combustion, the volume of oxygen required per unit of acetylene is

Solution:
QUESTION: 86

Which one of the following is the condition for stable equilibrium for a floating body?

Solution:
QUESTION: 87

A streamline is a line:

Solution:
QUESTION: 88

A reversible heat engine operating between hot and cold revervoirs delivers a work output of 54 kJ while it rejects a heat of 66 kJ. the efficiency of this engine is

Solution:
QUESTION: 89

Which one of the following expressions for Tds is true for a simple compressible substance ?(Notation have the usual meaning)

Solution:
QUESTION: 90

A length of 10 mm diameter steel wire is coiled to a close coiled helical spring having 8 coils of 75 mm mean diameter, and the spring has a stiffness K. If the same length of wire is coiled to 10 coils of 60 mm mean diameter, then the spring stiffness will be

Solution:
QUESTION: 91

If the principal stresses corresponding to a two - dimensional state of stress are s1 and s2. If s1
is greater than s2 and both are tensile, then which one of the following would be the correct criterion for failure by yielding, according to the maximum shear stress criterion ?

Solution:
QUESTION: 92

Falling drops of water become spheres due to the property of

Solution:
QUESTION: 93

In which type of welding a pool of molten metal is used

Solution:
QUESTION: 94

Hot tears are casting defects

Solution:
QUESTION: 95

Bevel gears are used to connect

Solution:
QUESTION: 96

Addendum in gears is

Solution:
QUESTION: 97

Contact ratio is defined as ratio of

Solution:
QUESTION: 98

Which law of motion (of Newton) give the measure of force ?

Solution:
QUESTION: 99

The shear stress at the centre of a circular shaft under torsion is

Solution:
QUESTION: 100

The direction of frictional force acting on a body which can slide on a fixed surface is

Solution: