TRB Mechanical 50 One Mark Questions

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This Test series useful for who are preparing for various technical examinations particularly TRB Mechanical, TNEB AE, TNPSC AE, SSC JE, NLC GET, ISRO Etc.,

A joint used to connect two co-axial rods which are subjected to either axial tensile force or axial compressive force

1 point

Knuckle Joint

Cotter Joint

Flange coupling

Universal Joint

Clear selection

It is impossible by any procedure, no matter how idealized, to reduce any system to the absolute zero of temperature in a finite number of operations, is called __________ Statement

1 point

H.B Callen

Kelvin-Planck Statement

Sadi Carnot

Fowler-Guggenheim

Clear selection

Newton’s law of viscosity states that for a Newtonian fluid, the

1 point

Shear stress is proportional to rate of shear strain

Shear stress is proportional to velocity

Shear stress is proportional to desnity

None of the above

Clear selection

Consider following statements: 1. The Complete conversion of Low Grade Energy into High Grade Energy is impossible. 2. The Exergy of a fluid at a high temperature is more than that at a lower temperature. 3. First Law states that energy is always conserved quality wise, the second law considered quantity wise. 4. The two reversible processes must coincide and produce equal amounts of work.

1 point

1, 2, 3, 4 are correct.

1, 2 & 4 are correct

1 & 2 are correct

1, 2, & 3 are correct

Clear selection

Statement-1: Heat Transfer and Work Transfer are the energy interactions. Statement-2: Heat Transfer is the energy interaction due to temperature difference only. All other energy interactions may be termed as work transfer. Which of the above statement is/are correct?

1 point

Statement 1 & 2 both is correct

Statement 1 & 2 Both in incorrect

Statement 1 is correct and 2 is incorrect

Statement 1 is incorrect and 2 is Correct

Clear selection

Wet clothes are hung on a clothesline outdoors in sub-zero weather. After a day, the clothes are brought into the house and observed to be dry. The process of drying is best explained as

1 point

Sublimation

Vaporization

Melting

Condensation

Clear selection

Assertion (A): Poisson’s Ratio of material is measure of its ductility. Reason (R): For every linear strain in the direction of force, Poisson’s ratio of the material gives the lateral strain and direction is perpendicular to the direction of force.

1 point

A is false but R is true.

A is true but R is false

Both A and R are true but R is not correct explanation for A

Both A and R are true and R is a correct explanation for A

Clear selection

Crowning is done on a pulley to

1 point

Increase the power capacity

Increase the creep

Increase the co-efficient of friction

Decrease the tendency of slip

Clear selection

A measure of Rockwell hardness is the

1 point

Depth of penetration of indenter

Projected area of indentation

Height of rebound

Surface area of indentation

Clear selection

A ship will sink if it does not displace water equal to its own

1 point

Volume

Density

Surface area

Weight

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Angle Dekkor is a type of

1 point

Auto-collimator

Interferometer

Sine bar

Clinometer

Clear selection

Angular Measurements are done to an accuracy of 5 minutes with

1 point

Sine Bar

Vernier Bevel Protractor

Combination Set

Protractor

Clear selection

Hydraulic efficiency of a turbine is

1 point

Power available at the inlet of turbine to power given by water to the turbine

Power of the shaft of the turbine to power given by water to the turbine

Power at the shaft of the turbine to power delivered by water.

Power at the shaft of the turbine to the power inlet of the turbine

Clear selection

Torsional-sectional-modulus of a shaft is also called as:

1 point

Sectional modulus

Torsional rigidity

Polar modulus

Torsion modulus

Clear selection

Your finger sticks to an ice tray just taken from the refrigerator. Which factor has more effect on this phenomenon

1 point

The humidity of the air

The thermal conductivity of the tray

The inside temperature of the freezer

The heat capacity of both your finger and the tray

Clear selection

Saturation temperature is a function of

1 point

Critical Volume

Critical temperature

Pressure

Temperature

Clear selection

In a structure subjected to fatigue loading, the minimum and maximum stresses developed in a cycle are 200 MPa and 400 MPa respectively. The value of stress amplitude (in MPa) is

1 point

100

300

-100

-300

Clear selection

Match the following

1 point

A-3;B-2;C-1;D-4

A-3;B-4;C-1;D-2

A-1;B-4;C-3;D-2

A-1;B-2;C-3;D-4

Clear selection

Comparators are used to

1 point

Composite errors

Measure dimensional differences

Zero errors

Measure dimensions

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Which one of the following statement is TRUE?

1 point

Kaplan turbine is an axial-flow reaction turbine

Both Pelton and Francis turbines are impulse turbine

Francis turbine is a reaction turbine but Kaplan turbine is an impulse turbine

Francis turbine is an axial – flow reaction turbine.

Clear selection

Match the list

1 point

A-3;B-2;C-1;D-4

A-2;B-3;C-1;D-4

A-3;B-2;C-4;D-1

A-2; B-3;C-4;D-1

Clear selection

Match the List (Quantity Measure)-I with List (Measuring Devices)-II

1 point

A-1;B-2;C-3;D-4

A-2;B-4;C-1;D-3

A-2;B-4;C-3;D-1

A-4;B-2;C-3;D-1

Clear selection

Go Gauge are meant to check

1 point

One feature

Multiple features

Wear

None of these

Clear selection

If Z is absolute viscosity of the lubricant N is the speed of journal and P is bearing pressure, then the bearing characteristic number

1 point

P/ZN

ZN/P

Z/PN

ZP/N

Clear selection

In case of Izod test, the test specimen kept as

1 point

Cantilever beam

Overhanging beam

Fixed end beam

Simply Supported beam

Clear selection

Kernel or core of a section is the figure within which load may be placed so as

1 point

Not to produce tensile stress anywhere in the section.

To produce tensile stress in the middle of the section

To produce tensile stress at both ends of the section

To produce tensile stress at one end compressive stress at the other end

Clear selection

How can shock absorbing capacity of a bolt be increased?

1 point

By tightening it properly

By making the shank diameter equal or less than the core diameter of thread.

By increasing shank diameter

By grinding the shank

Clear selection

Three beams of circular, square, rectangular (with depth twice the width) sections and of same length are subjected to the same maximum bending moment. If allowable stress is the same then the section which will require maximum weight of the same material will be

1 point

Circular

Square

All of same weight.

Rectangular

Clear selection

The Least Count of Vernier Caliper is

1 point

0.01 mm

0.1 mm

0.02 mm

0.001 mm

Clear selection

Anvil and thimble are found in this measuring instrument

1 point

Vernier Caliper

Vernier Height Gauge

Micrometer

Combination Set

Clear selection

The long bearing have the advantage of _________ compared to short bearing.

1 point

More load carrying capacity with more heat dissipation

Less load carrying capacity with more heat dissipation.

More heat dissipation

More load carrying capacity

Clear selection

The coupling which is used to connect which are perfectly aligned

1 point

Old ham’s coupling

Universal coupling

Bushed pin type coupling

Flange coupling

Clear selection

If the head on the turbine is more than 300 m, the type of turbine used should be

1 point

Kaplan

Pelton Wheel

Propeller

Francis

Clear selection

A cantilever beam of length 100 mm is subjected to an load of 150 N. If young modulus is 200 GPa and Moment of Inertia is 5000 mm^4, the maximum deflection of this beam is

1 point

0.5 mm

5 mm

0.05 mm

0.01 mm

Clear selection

The control chart used for the number of defects per unit is

1 point

Mean chart

c-chart

p-chart

Range chart

Clear selection

Torque transmitted by friction clutch

1 point

Is same on the assumption of uniform pressure and uniform wear

Is less on the assumption of uniform pressure as compared to uniform wear

Is more or less on the assumption of uniform pressure as compared to uniform wear depending upon material

Is more on the assumption of uniform pressure as compared to uniform wear

Clear selection

The least count of inside micrometer

1 point

0.001 mm

0.01 mm

1 mm

0.02 mm

Clear selection

Measurements on cylindrical surface are done with

1 point

Narrow Scale

Book Scale

Folding Scale

Flexible Scale

Clear selection

Statement (I): Entropy Transfer associated with heat transfer. Statement (II): When heat is imparted to a system, the disorderly motion of molecules increases and the reverse occurs when heat is removed from the system

1 point

Both Statement (I) and Statement (II) are individually true and Statement (II) is the Correct explanation of Statement (I).

Statement (I) is true, but Statement (II) is false

Both Statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I).

Statement (I) is false, but Statement (II) is true

Clear selection

A pinion rotates at 1200 rpm and transmits a torque of 20N-m. This pinion of 40 teeth mesh with other spur gear having 60 teeth. The torque transmitted by the gear is

1 point

30 N-m

15 N-m

40 N-m

20 N-m

Clear selection

Kaplan water turbine is commonly used when the flow through its runner is

1 point

Axial and the head available is more than 100m.

Radial and the head available is more than 100m.

Axial and the head available is less than 10m.

Mixed and the head available is about 50m.

Clear selection

1 point

A-4;B-1;C-3;D-2

A-1; B-2;C-3;D-4

A-2;B-3;C-1;D-4

A-3;B-2;C-4;D-1

Clear selection

Slow plastic deformation of a material under constant stress is:

1 point

Creep

Fatigue

Gradual deformation

Proof deformation

Clear selection

Calculate the pressure due to a column of 0.2 m of water

1 point

1000 N/m^2

2962 N/m^2

1962 N/m^2

962 N/m^2

Clear selection

For steady flow of a viscous incompressible fluid through a circular pipe of constant diameter, the average velocity in the fully developed region is constant. Which one of the following statements about the average velocity in the developing region is TRUE?

1 point

It is constant and is equal to the average velocity in the fully developed region

It is constant but always lower than the average velocity in the fully developed region.

It increases until the flow is fully developed.

It decreases until the flow is fully developed

Clear selection

Match the following List

1 point

A-3;B-2;C-1;D-4

A-2;B-3;C-4;D-1

A-1;B-3;C-4;D-2

A-2;B-4;C-3;D-1

Clear selection

In hole basis system fit is obtained by

1 point

Varying the tolerance on both the hole and shaft

Keeping the shaft size fixed.

Varying the tolerance on the shaft

Varying the tolerance on the hole

Clear selection

For a completely submerged body with center of gravity ‘G’ and centre of buoyancy ‘B’ , the condition of stability will be

1 point

G is located below B

G is located above B

Independent of the locations of G and B

G and B are coincident

Clear selection

Statement (I): Enthalpy of an ideal gas depends only on temperature. Statement (II): The Internal energy of an ideal gas depends only on the temperature. So, the enthalpy of an ideal gas also depends on the temperature

1 point

Statement (I) is true, but Statement (II) is false

Statement (I) is false, but Statement (II) is true

Both Statement (I) and Statement (II) are individually true, but Statement (II) is not the correct explanation of Statement (I).

Both Statement (I) and Statement (II) are individually true and Statement (II) is the Correct explanation of Statement (I).

Clear selection

One Tonne of Refrigeration is equal to

1 point

4.74 kW

3.51 kW

1.0 kW

7.12 HP

Clear selection

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