Practice Test: Question Set - 03
1. The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then
- (A) Wet bulb temperature = dry bulb temperature
- (B) Wet bulb temperature = dew point temperature
- (C) Saturation temperature = dew point temperature
- (D) All 'a', 'b' & 'c'
2. Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails
- (A) Below the yield point
- (B) Above the yield point
- (C) Below the elastic limit
- (D) At the elastic limit
3. Addition of silicon to cast iron
- (A) Promotes graphite module formation
- (B) Improves its ductility
- (C) Does not promote graphite flakes formation
- (D) Increases the fluidity of molten metal
4. The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as
- (A) Rigid
- (B) Tough
- (C) Ductile
- (D) Plastic
5. ________ is used as a material of construction for the blade of power saw.
- (A) Wrought iron
- (B) Stainless steel
- (C) Mild steel
- (D) High speed steel
6. A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
- (A) Increase
- (B) Decrease
- (C) Remain unaffected
- (D) May increase or decrease; depends on the
thickness of each layer
7. Pick out the wrong statement.
- (A) Cold cracking of a weld is due to the presence of hydrogen gas in
the weld
- (B) True stress is given by, σ = σE (1 + εE), where
σE and εE are engineering stress and engineering strain respectively
- (C) Phosphorous can be easily recovered in the iron blast furnace
- (D) High residual stress at the surface is beneficial for fatigue
properties of a material
8. The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the
- (A) Ability to absorb shock
- (B) Capacity to store energy
- (C) Ratio of the wire & coil diameters
- (D) Load to produce unit deflection
9. The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is
- (A) More
- (B) Equal
- (C) Less
- (D) Double
10. Which of the following is not the function of a volute casing provided in a centrifugal pump?
- (A) To reduce the head loss in discharge
- (B) To increase the pump efficiency
- (C) To collect liquid from the periphery of the
impeller and to transmit it to the delivery pipe at constant velocity
- (D) To increase the pump discharge rate
11. Pick out the wrong statement.
- (A) For a pressure vessel to be classified as 'thin vessel', the ratio
of wall thickness to mean radius is less than 0.1
- (B) For calculating forces and efficiency of riveted
joint, either rivet diameter or rivet hole diameter is used in case of pressure
vessel and in structural work
- (C) Longitudinal joint is normally made butt joint
to maintain the circularity of the vessel
- (D) Maximum diameter of the opening provided in a
pressure vessel, which does not require any compensation is 200 mm
12. The main reducing agent in iron blast furnace is
- (A) Carbon dioxide
- (B) Carbon monoxide
- (C) Oxygen
- (D) Air
13. Broaching tools are usually made of
- (A) Cermets
- (B) High speed steel
- (C) Tungsten carbide
- (D) Stellite
14. Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?
- (A) Aluminium
- (B) Copper
- (C) Titanium
- (D) Stainless steel
15. FeO (s) + CO (g) = Fe (s) + CO2 (g), k = 0. 435 at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K?
- (A) 1.0
- (B) 1.3
- (C) 2.3
- (D) 3.3
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