Practice Test: Question Set - 13
1. Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?
- (A) Output & fineness
- (B) Velocity
- (C) Both (a) & (b)
- (D) None of these
2. Unit of viscosity in CGS system is
- (A) gm .cm-1 sec-1
- (B) gm . cm2 . sec-2
- (C) gm .cm-2. sec-1
- (D) gm . cm . sec-1
3. The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be
- (A) 0.8
- (B) 1
- (C) 1.4
- (D) 1.8
4. The refractory lining of the bottom in a basic electric arc furnace is made of
- (A) Silica
- (B) Alumina
- (C) Magnesia
- (D) Fireclay
5. 'Cryogenics' is concerned with the generation & use of low temperature in the range of
- (A) 0°K to 123°K
- (B) 0°C to - 123°C
- (C) 0°C to - 273°C
- (D) 0°K to 273°K
6. The specific gravity of coal depends mainly on its __________ content.
- (A) Carbon
- (B) Volatile matter
- (C) Ash
- (D) Moisture
7. The heat of neutralization remains constant, when there is a reaction between dilute solutions of strong
- (A) Base and strong acid
- (B) Base and weak acid
- (C) Acid and weak base
- (D) None of these
8. In practice, the compression ratio of compression-ignition (CI) engine ranges from
- (A) 15 to 25
- (B) 5 to 10
- (C) 40 to 55
- (D) 60 to 70
9. Carbon is present in the form of _________ in grey cast iron.
- (A) Spheroids
- (B) Nodular aggregates of graphite
- (C) Flakes
- (D) Cementite
10. Brittleness induced due to the presence of sulphur in steel can be reduced by adding
- (A) Manganese
- (B) Magnesium
- (C) Vanadium
- (D) Copper
11. Spherical shape of mercury droplets is due to its
- (A) High viscosity
- (B) Low surface tension
- (C) High density
- (D) High surface tension
12. With increase in temperature, the surface tension of water
- (A) Increases
- (B) Decreases
- (C) Remain constant
- (D) Increases linearly
13. Increase in the entropy of a system represents the
- (A) Degradation of energy
- (B) Decrease in system pressure
- (C) Increase in the availability of energy
- (D) Increase in the temperature
14. Compressed dry air is used as the cutting fluid, while machining
- (A) Steel
- (B) Cast iron
- (C) Aluminium
- (D) None of these
15. Minimum number of members required to form a Public Limited Joint Stock Company is
- (A) 7
- (B) 10
- (C) 12
- (D) 17
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