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# Test: Mechanical Engineering- 4

## 100 Questions MCQ Test Mock Test Series for SSC JE Mechanical Engineering | Test: Mechanical Engineering- 4

Description
This mock test of Test: Mechanical Engineering- 4 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 100 Multiple Choice Questions for Mechanical Engineering Test: Mechanical Engineering- 4 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Mechanical Engineering- 4 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Test: Mechanical Engineering- 4 exercise for a better result in the exam. You can find other Test: Mechanical Engineering- 4 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

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QUESTION: 2

Solution:
QUESTION: 3

### When an ideal gas with constant specific heats is throttled adiabatically, with negligible changes in kinetic and potential energies.

Solution:
QUESTION: 4

Which of the following relationships is valid only for reversible processes undergone by a closedsystem of simple compressible substance (neglect changes in kinetic and potential energy) ?

Solution:

Q = dU + PdV
Reversible closed system TdS = du + Pdv

QUESTION: 5

The relationship ​ 0 holds good for

Solution:
QUESTION: 6

During the phase change of a pure substance

Solution:
QUESTION: 7

At the triple point of a pure substance, the number of degrees of freedom is

Solution: QUESTION: 8

The standard value of atmospheric pressure taken at sea level is

Solution:
QUESTION: 9

For a perfect gas, according to Boyle's law

where p = Absolute pressure,
v = Volume, and
T = Absolute temperature

Solution:
QUESTION: 10

When a gas is heated, change takes place in

Solution:
QUESTION: 11

The general law for the expansion or compression of gases, is

Solution:
QUESTION: 12

The property of working substance which increases or decreases as the heat is supplied orremoved in a reversible manner, is known as

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QUESTION: 13

The use of Refrigerant R–22 for temperature below – 30º is not recommended due to its

Solution:
QUESTION: 14

Global warming is caused by

Solution:  QUESTION: 15

In the window air conditioner, the expansion device used is

Solution: QUESTION: 16

Bell-Coleman cycle is a

Solution:
QUESTION: 17

In a reversed Brayton cycle, the heat is absorbed by the air during

Solution:
QUESTION: 18

The power output from a spark ignition engine is varied by

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QUESTION: 19

An air standard diesel cycle consists of

Solution:
QUESTION: 20

BHP of a diesel engine can be increased by

Solution:
QUESTION: 21

Alcohols are unsuitable at diesel engine fuels because

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QUESTION: 22

Knocking tendency in a SI engine reduces with increasing

Solution:
QUESTION: 23

​A diesel engine has

Solution:
QUESTION: 24

The colour of exhaust from diesel engine is generally

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QUESTION: 25

A economizer in a steam generator performs the function of

Solution: QUESTION: 26

For a given set of operating pressure limits of a Rankine cycle the highest efficiency occurs for

Solution:
QUESTION: 27

In a Rankine cycle heat is added

Solution:
QUESTION: 28

Boiler rating is usually defined in terms of

Solution:  QUESTION: 29

In steam and other vapour cycle, the process of removing non-condensable is called

Solution:
QUESTION: 30

A gas turbine cycle with heat exchange and reheating improves

Solution:
QUESTION: 31

A gas turbine cycle with infinitely large number of stages during compression and expansionleads to

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QUESTION: 32

The high steam and low water safety valve is not used in

Solution:
QUESTION: 33

The draught in locomotive boilers is produced by a

Solution:
QUESTION: 34

All steam engines work on

Solution:
QUESTION: 35

Naiver Stoke's equation represents the conservation of

Solution:
QUESTION: 36

For the stability of a floating body, under the influence of gravity alone, which of the followingis TRUE ?

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QUESTION: 37

Streamlines, path lines and streak lines are virtually identical for

Solution:
QUESTION: 38

Existence of velocity potential implies that

Solution:
QUESTION: 39

Specific speed of a Kaplan turbine ranges between

Solution:
QUESTION: 40

Kalpan turbine is

Solution:
QUESTION: 41

The pressure of a liquid measured with the help of a piezometer tube is

Solution:
QUESTION: 42

A body floating in a liquid is said to be in neutral equilibrium, if its metacentre

Solution:
QUESTION: 43

The total head of a liquid particle in motion is equal to

Solution:
QUESTION: 44

A pitot tube is used to measure the

Solution:
QUESTION: 45

The specific speed of a turbine is given by the equation

Solution:
QUESTION: 46

The specific speed of a hydraulic turbine depends upon

Solution:
QUESTION: 47

The impeller of a centrifugal pump may have

Solution:
QUESTION: 48

A stone of mass m at the end of a string of length l is whirled in a vertical circle at a constant speed.The tension is the string will be maximum when the stone is

Solution:
QUESTION: 49

A steel wheel of 600 mm diameter on a horizontal steel rail. It carries a load of 500 N. Thecoefficient of rolling resistance is 0.3 The force in Newton, necessary to roll the wheel along therail is

Solution:
QUESTION: 50

slack side in a flat belt drive is

Solution:
QUESTION: 51

A 1 kg block is resting on a surface with coefficient of friction μ = 0.1. A force of 0.8 N isapplied to the block as shown in the figure. The friction force is Solution: QUESTION: 52

A cylindrical elastic body subjected to pure torsion about its axis develops

Solution:
QUESTION: 53

A rod of length L and diameter D is subjected to a tensile load P. Which of the following is sufficientto calculate the resulting change in diameter ?

Solution:
QUESTION: 54

An elastic body is subjected to a tensile stress X in a particular direction and a compressive stressY in its perpendicular direction. X and Y are unequal in magnitude. On the plane of maximumshear stress in the body there will be

Solution:
QUESTION: 55

In terms of Poisson's ratio (m) the ratio of Young's Modulus (E) to Shear Modulus (G) of
elastic materials is

Solution:
QUESTION: 56

A long thin walled cylindrical shell, closed at both the ends, is subjected to an internal pressure.The ratio of the hoop stress (circumferential stress) to longitudinal stress developed in the shellis

Solution:
QUESTION: 57

A concentrated load P acts on a simply supported beam of span L at a distance L/3 from the left
support. The bending moment at the point of application of the load is given by

Solution:
QUESTION: 58

A cantilever beam of length L is subjected to a moment M at the free end. The moment of inertia of the beam cross section about the neutral axis is I and the Young's modulus is E. The magnitude of the maximum deflection is

Solution:
QUESTION: 59

A bolt is made to pass through a tube and both of them are tightly fitted with the help of washersand nuts. If the nut is tightened, then

Solution:
QUESTION: 60

The ratio of shear modulus to the modulus of elasticity for a elasticity for a Poisson's ratio of0.4 will be

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QUESTION: 61

According to Euler's column theory, the crippling load for a column of length (l) with one end fixed and the other end hinged, is

Solution:
QUESTION: 62

A column with maximum equivalent length has

Solution:
QUESTION: 63

The Rankine's formula holds good for

Solution:
QUESTION: 64

The number of degrees of freedom of a five link planer mechanism with five revolute pairs asshown in the figure is Solution:
QUESTION: 65

For the planar mechanism shown in figure select the most appropriate choice ofr the motion oflink 2 when link 4 is moved upwards: Solution:
QUESTION: 66

The mechanism used in a shaping machine is

Solution:
QUESTION: 67

When a cylinder is located in a Vee-block, the number of degrees of freedom which are arrestedis

Solution:
QUESTION: 68

List -I (Gear types)
a. Worm gears
b. Cross helical gears
c. Bevel gears
d. Spur gears

List – II (Application)
1. Parallel Shafts
2. Nonparallel, intersecting shafts
3. Non parallel, nonintersecting shafts
4. Large speed ratios Solution:
QUESTION: 69

As shown in figure, a mass of 100 kg is held between two springs. The natural frequency of
vibration of the system in cycle/s, is Solution:
QUESTION: 70

Which of the following is an example of sliding pair ?

Solution:
QUESTION: 71

The cam and follower is an example of

Solution:
QUESTION: 72

When the two elements of a pair have a surface contact when relative motion takes place and thesurface of one element slides over the surface of the other, the pair formed is known as a

Solution:
QUESTION: 73

The centre distance between two meshing involute gears is equal to

Solution:
QUESTION: 74

In the design of shafts made of ductile materials subjected to twisting moment and bendingmoment, the recommended theory of failure is

Solution:
QUESTION: 75

The outside diameter of a hollow shaft that is twice its inside diameter the ratio of its torquecarrying capacity to that of a solid shaft of the same material and the same outside diameter is

Solution:
QUESTION: 76

Solution:
QUESTION: 77

Torque to weight ratio for a circular shaft transmitting power is directly proportional to the

Solution:
QUESTION: 78

Starting friction is low in

Solution:
QUESTION: 79

Spherical roller bearings are normally used

Solution:
QUESTION: 80

In thick film hydrodynamic journal bearings the coefficient of friction

Solution:
QUESTION: 81

Riser is designed so as to

Solution:
QUESTION: 82

Chills are used in moulds to

Solution:
QUESTION: 83

Hot rolling of mild steel is carried out

Solution:
QUESTION: 84

Match the correct combination for following metal working processes.
Processes
P. Blanking
Q. Stretch Forming
R. Coining
S. Deep Drawing
Associated state of stress
1. Tension
2. Compression
3. Shear
4. Tension and Compression
5. Tension and shear Solution:
QUESTION: 85

Wrinkling is a common defect found is

Solution:
QUESTION: 86

For gas welding a particular job using a neutral oxyacetylene flame the acetylene consumptionwas 10 liters. The oxygen consumption from the cylinder in liters will be

Solution:
QUESTION: 87

Preheating before welding is done to

Solution:
QUESTION: 88

The standard specification of a grinding wheel is A-46=M-6-V-21. It means a wheel of

Solution:
QUESTION: 89

Cutting speed in grindning is set to a high value of

Solution:
QUESTION: 90

Crater wear always starts at some distance from the tool tip because at the point

Solution:
QUESTION: 91

Which of the following material has maximum ductility?

Solution:
QUESTION: 92

The carbon in the pig iron varies from

Solution:
QUESTION: 93

​Shock resistance of steel is increased by adding

Solution:
QUESTION: 94

The bond formed by transferring electrons from one atom to another is called

Solution:
QUESTION: 95

During hot working of metals

Solution:
QUESTION: 96

Tubes for shaving cream and tooth paste are made by

Solution:
QUESTION: 97

The rake angle required to machine brass by high speed steel tool is

Solution:
QUESTION: 98

Solution:
QUESTION: 99

The factor considered for evaluation of machinability is

Solution:
QUESTION: 100

Chip breakers are used to

Solution: