Basics Of Mechanical Engineering

50 Questions | By Mechkarpagam | Updated: Mar 21, 2022 | Attempts: 285

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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.
  
  Adhesion
- 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