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Objective Questions

Latest AFCAT Exam Question (Objective Questions), MCQ in English

Subjects : Mechanical

Question Bank AFCAT EKT Exam (Mechanical) - English
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Mechanical

Question 1Single Answer
If a submerged body displaced from its equilibrium position, returns to its original position, it is called __________.
  1. A
    thermal equilibrium
  2. B
    neutral equilibrium
  3. C
    unstable equilibrium
  4. D
    stable equilibrium
Question 2Single Answer
In a flow measurement, a venturi meter is preferred over an orifice plate because _____.
  1. A
    energy of head loss is less
  2. B
    It is cheaper
  3. C
    pressure drop is more
  4. D
    space is limited  
Question 3Single Answer
Pitot tube measures ______.
  1. A
    dynamic pressure of a moving stream
  2. B
    guage pressure
  3. C
    temperature of moving water
  4. D
    pressure difference between two fluids
Question 4Single Answer
Which of the following is not a property of an ideal fluid ?
  1. A
    flow is irrotational
  2. B
    it has no viscosity
  3. C
    it has viscosity
  4. D
    it is incompressible
Question 5Single Answer
Nozzle used in steam turbines convert ________.
  1. A
    enthalpy of steam into work
  2. B
    enthalpy of steam into kinetic energy
  3. C
    enthalpy of steam into pressure energy
  4. D
    pressure energy into work
Question 6Single Answer
Which of the following assumptions is the most relevant in air-standard cycle analysis ?
  1. A
    All the processes within the cycle are irreversible
  2. B
    Working fluid is a fixed mass
  3. C
    Specific heat of air changes during the cycle
  4. D
    Cycle is assumed to be an open cycle
Question 7Single Answer
The modern Francis turbine is a ___________flow turbine .
  1. A
    tangential 
  2. B
    axial
  3. C
    radial
  4. D
    mixed
Question 8Single Answer
Variation of stress with strain rate for a Newtonian fluid is ______ .
  1. A
    hyperbolic
  2. B
    linear
  3. C
    elliptical
  4. D
    parabolic
Question 9Single Answer
Which of the following is NOT a part of refrigeration systems ?
  1. A
    Turbine
  2. B
    Evaporator
  3. C
    Compressor
  4. D
    Condenser
Question 10Single Answer
Which of the following is NOT an intensive property ?
  1. A
    Temperature
  2. B
    Total volume
  3. C
    Pressure
  4. D
    Density
Question 11Single Answer
Which of the following does NOT represent a unit of viscosity ?
  1. A
    Stoke
  2. B
    Poise
  3. C
    m²/sec
  4. D
    N-m/sec
Question 12Single Answer
__________ in the fuel is oxidised during knocking .
  1. A
    Hydrocarbon
  2. B
    Phosphorous
  3. C
    Water
  4. D
    Coal
Question 13Single Answer
_________ is defined as the ability of a material to resist deformation under action of an external load .
  1. A
    Stiffness
  2. B
    Resilience
  3. C
    Brittleness
  4. D
    Toughness
Question 14Single Answer
Draught is produced in locomotive boilers by which of the following components ?
  1. A
    Locomotive
  2. B
    Steam jet
  3. C
    Centrifugal fan
  4. D
    Chimney
Question 15Single Answer
For a steady flow, the value of all fluid properties at any fixed point _________ .
  1. A
    do not change with location
  2. B
    change with time
  3. C
    change with location
  4. D
    do not change with time
Question 16Single Answer
For a floating body, if the metacentre is below the centre of gravity, then the body is said to be __________ equilibrium .
  1. A
    thermal 
  2. B
    stable 
  3. C
    unstable
  4. D
    neutral
Question 17Single Answer
________ is useful for measuring flow of a conducting fluid .
  1. A
    Orifice meter
  2. B
    Rotameter
  3. C
    Vane meter
  4. D
    Electro-magnetic flow meter
Question 18Single Answer
A two- stroke engine consists of ________ port (s)
  1. A
    Three
  2. B
    Four
  3. C
    One
  4. D
    Two
Question 19Single Answer
Air Cooling is mostly preferred for _________ .
  1. A
    heavy truck
  2. B
    buses
  3. C
    moto cycles
  4. D
    multi-utility vehicles
Question 20Single Answer
_______ valves are provided in reciprocating compressors .
  1. A
    Simply supported
  2. B
    Solenoid
  3. C
    Plate
  4. D
    Poppet
Question 21Single Answer
Benson boiler have ______ water drum (s)
  1. A
    One
  2. B
    Zero
  3. C
    Three
  4. D
    Two
Question 22Single Answer
_________ is used for pumping water into a boilers .
  1. A
    Economiser
  2. B
    Duplex pump
  3. C
    Feed pump
  4. D
    Rotor
Question 23Single Answer
The function of a carburetor in internal combustion engines is :
  1. A
    to control fuel alone
  2. B
    to cool exhaust gases
  3. C
    to maintain air-fuel ratio
  4. D
    to control air alone
Question 24Single Answer
The device which transfers energy from the ______ to _____ the is known as hydraulic turbine .
  1. A
    atmosphere; fluid  
  2. B
      rotor; fluid
  3. C
    fluid; rotor
  4. D
    fluid; atmosphere
Question 25Single Answer
The flash chamber in the single stage VCR cycle serves to ________ .
  1. A
    decrease the compression ratio
  2. B
    increase the refrigerating effect
  3. C
    increase the compression ratio
  4. D
    decrease the refrigerating effect
Question 26Single Answer
Define thermodynamics .
  1. A
    It is a science which deals with the relation between heat, work and properties of systems
  2. B
    It is a science which deals with work done
  3. C
    It deals with dynamics under thermal conditions
  4. D
    It is science which deals with the relation between work and properties
Question 27Single Answer
Which of the following statements is correct about a Benson boiler ?
  1. A
    Air is sent through the same direction
  2. B
    There is no recirculation of water
  3. C
    Steam is sent out in multiple directions
  4. D
    Flue gases pass only in one direction
Question 28Single Answer
Within a refrigeration system, the expansion valve is incorporated between the ________ .
  1. A
    Super-heater and sub-cooler 
  2. B
    compressor and condenser
  3. C
    evaporator and compressor
  4. D
    condenser and evaporator
Question 29Single Answer
The reversed ______ cycle employed for passenger aircraft systems . 
  1. A
    Carnot     
  2. B
    Atkinson
  3. C
    Ericsson
  4. D
    Brayton
Question 30Single Answer
Fusible plug in a steam boiler is placed ______ .
  1. A
    below the water level indicator
  2. B
    at he crown of the furnace
  3. C
    at the fire grate of the boiler
  4. D
    near the manhole
Question 31Single Answer
Aqua ammonia solution used in a vapour absorption refrigeration system is a solution of ammonia in ________ .
  1. A
    CF3              
  2. B
     LiBr       
  3. C
    H2O2  
  4. D
    H2O  
Question 32Single Answer
Coated electrodes are used in ______ .
  1. A
    gas tungsten arc welding 
  2. B
    submerged arc welding
  3. C
    tungsten insert gas welding
  4. D
    shielded metal arc welding
Question 33Single Answer
Where is air cycle refrigeration commonly used ?
  1. A
    Domestic refrigerator
  2. B
    Cold storage
  3. C
    Aircraft conditioning
  4. D
    Car air conditioning
Question 34Single Answer
________, is not a water tube boiler .
  1. A
    Benson boiler
  2. B
    Babcock-Wilcox boiler
  3. C
    Stirling boiler
  4. D
    Scotch marine
Question 35Single Answer
Stoke is another unit of -
  1. A
    kinematic viscosityy
  2. B
    velocity gradient
  3. C
    Shear stress
  4. D
    dynamic viscosit
Question 36Single Answer
For a refrigerating machine, capacity is expressed as ______ .
  1. A
    the lowest temperature attained    
  2. B
    inside volume of the cabinet
  3. C
    gross weight of the machine 
  4. D
    rate of heat extraction from the space being cooled
Question 37Single Answer
The value of quality or dryness fraction of a substance in saturated liquid-vapor mixture is ________ .
  1. A
    1         
  2. B
    2 
  3. C
    Zero
  4. D
    between Zero and 1
Question 38Single Answer
Uniform flow is the type of flow where in velocity at any given time ________- with respect to space .
  1. A
    Decreases
  2. B
    Does not change
  3. C
    Increases
  4. D
    Changes
Question 39Single Answer
______ falls under the category of a water tube boiler .
  1. A
    Locomotive boiler     
  2. B
    Lancashire boiler
  3. C
    Cornish boiler
  4. D
    LaMont boiler
Question 40Single Answer
Chaplets are used in ________ .
  1. A
    forging
  2. B
    casting  
  3. C
    welding
  4. D
    extrusion
Question 41Single Answer
Which of the following is NOT a unit of pressure ?
  1. A
    Pa  
  2. B
    Bar
  3. C
    N/m²
  4. D
    Joule
Question 42Single Answer
What was the first refrigerant used in continuous refrigeration system ?
  1. A
    Ammonia    
  2. B
    Water
  3. C
     Air
  4. D
    Carbon dioxide
Question 43Single Answer
For a 2 m deep swimming pool, pressure difference between the top and the bottom of the pool is ________ kPa .
  1. A
    22
  2. B
    19.6
  3. C
    11
  4. D
    12
Question 44Single Answer
Pressure measurement is done by ____. by measuring heat loss from a heated wire .
  1. A
     A pirani gauge
  2. B
    a manometer 
  3. C
    a barometer
  4. D
    an orifice meter
Question 45Single Answer
In the Rankine cycle, the fluid which enters the boiler is :
  1. A
    water
  2. B
    steam
  3. C
    mercury
  4. D
    oxygen
Question 46Single Answer
Percentage elongating measured during tensile testing indicates _____ .
  1. A
    malleability
  2. B
    fatigue strength
  3. C
    creep
  4. D
    ductility
Question 47Single Answer
For a given centrifugal pump, discharge varies _______ with speed .
  1. A
    fifth power of
  2. B
    linearly
  3. C
    inversely
  4. D
    square root of
Question 48Single Answer
Foaming is a phenomenon that occurs in the boiler feed water due to _____ .
  1. A
    nitrogen peroxide
  2. B
    manganese
  3. C
    sodium chloride
  4. D
    oil
Question 49Single Answer
Compounding of a steam turbine is done to ______ .
  1. A
    balance the rotor
  2. B
    reduce the rotor speed
  3. C
    reduce the blade friction
  4. D
    connect the shaft
Question 50Single Answer
Any change in entropy could be achieved by changing______ .
  1. A
    velocity
  2. B
    heat
  3. C
    acceleration
  4. D
    mass
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