# Basics Of Mechanical Engineering

50 Questions | Total Attempts: 183  Settings  • 1.
The drag force exerted by a fluid on a body immersed in the fluid is due to
• A.

Pressure and viscous forces

• B.

Pressure and gravity forces

• C.

Pressure and surface tension forces

• D.

Viscous and gravity forces

• 2.
Newton law of viscosity depends upon the
• A.

Stress and strain of the fluid

• B.

Shear stress, pressure and velocity

• C.

Shear stress and rate of strain

• D.

Viscosity and shear stress

• 3.
For a Newtonian fluid
• A.

Shear stress  is proportional to shear strain

• B.

Rate of shear stress  is proportional to shear strain

• C.

Shear stress  is proportional to rate of shear strain

• D.

Rate of shear stress  is proportional to rate of shear strain

• 4.
Surface tension is due to
• A.

Viscous forces

• B.

Cohesion

• C.

• D.

The difference between adhesive and cohesive forces

• 5.
The relative density of mercury is
• A.

1

• B.

9.8

• C.

13.6

• D.

13600

• 6.
If the Reynolds number is less than 2000, the flow in a pipe is
• A.

Turbulent

• B.

Laminar

• C.

Transition

• D.

None of the above

• 7.
Anemometer is used to measure
• A.

Velocity

• B.

Pressure

• C.

Viscosity

• D.

Density

• 8.
Property of fluid that describes its internal resistance is known as:
• A.

Viscosity

• B.

Friction

• C.

Resistance

• D.

Internal energy

• 9.
The heat is absorbed by
• A.

Condenser

• B.

Evaporator

• C.

Compressor

• D.

Thermostat

• 10.
The body which absorbs all radiations incident upon it, is called as
• A.

Black body

• B.

White body

• C.

Opaque body

• D.

Transparent body

• 11.
Heat transfer takes place according to
• A.

First Law of Thermodynamics

• B.

Second Law of Thermodynamics

• C.

Third Law of Thermodynamics

• D.

Zeroth Law of Thermodynamics

• 12.
Heat is mainly transferred by conduction, convection and radiation in
• A.

Insulated pipes carrying hot water

• B.

Refrigerator freezer coil

• C.

Boiler furnaces

• D.

Condensation of steam in a condenser

• 13.
Units for thermal conductivity
• A.

J/kg.K

• B.

J/mol.K

• C.

J.ohm/sec.K2

• D.

W/m.K

• 14.
The heat generated in resistance welding is given by:
• A.

H = I2RT

• B.

H = I2R / T

• C.

H = I2R / T

• D.

H = I2R / T

• 15.
The process of joining two pieces in which a non-ferrous alloy is introduced in a liquid state between the piece of metals and allowed to solidify is known as
• A.

Welding

• B.

Brazing

• C.

Lancing

• D.

Riveting

• 16.
Which of the following operation is required for making a chamfer on the edge of a hole?
• A.

Spot facing

• B.

Facing

• C.

Facing

• D.

Counter sinking

• 17.
Which of the following operation(s) can be performed by a drilling machine?
• A.

Drilling

• B.

Reaming

• C.

Boring

• D.

all of the above

• 18.
Size of the lathe is specified by:
• A.

Maximum job length in mm that may be held between centers

• B.

The height of centers measured over the lathe bed

• C.

Maximum job length in mm that may be held between centers

• D.

All of the above

• 19.
The process of making cup-shaped parts from sheet metal blank pulling into dies with the help of punch is called:
• A.

Drawing

• B.

Spinning

• C.

Extrusion

• D.

Forming

• 20.
Stainless steel is very difficult to grind due to its
• A.

Toughness

• B.

Ability to work harden

• C.

Both (A) and (B)

• D.

None of the above

• 21.
Grinding is commonly used on
• A.

Aluminium

• B.

Brass

• C.

Plastic

• D.

Cast Iron

• 22.
For a turning operation, the ‘l’ is the length of the job, ‘f’ is the feed rate and ‘n’ is the rpm of work. The cutting time for turning is calculated by:
• A.

F / (l x n) minutes

• B.

N / (f x l) minutes

• C.

(f x n) / l minutes

• D.

L / (f x n) minutes

• 23.
The steel containing 0.8% carbon has a structure of
• A.

Cementite

• B.

Pearlite

• C.

Martensite

• D.

Ferrite

• 24.
If a bar of length, l, cross-sectional area, A, weighing, W, is fixed vertically at its upper end, its elongation is equal to
• A.

Wl/2AE

• B.

Wl/AE

• C.

2AE/2Wl

• D.

AE/Wl

• 25.
In a cantilever, the bending moment is maximum at the
• A.

Free end

• B.

Mid span

• C.

Fixed end

• D.

None of the above

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