Practice Test: Question Set - 07
1. Corona discharge is related to the operation of a/an
- (A) Induction motor
- (B) Electrostatic precipitator
- (C) Fast breeder reactor
- (D) Magneto hydrodynamic generator (MHD)
2. With increase in annealing temperature, the following defect density decreases.
- (A) Vacancy
- (B) Dislocation
- (C) Grain boundary
- (D) All of these
3. Minimum thermal efficiency of a steam boiler may be around __________ percent
- (A) 25
- (B) 45
- (C) 65
- (D) 20
4. The leaching solvent used in Baeyer's process for the purification of bauxite is
- (A) Ammonium hydroxide
- (B) Sodium carbonate
- (C) Sodium hydroxide
- (D) Ammonium carbonate
5. Eutectic reaction for iron-carbon system occurs at a temperature of _________ °C.
- (A) 723
- (B) 959
- (C) 1147
- (D) 1493
6. Boiling point of water gets lowered at high altitudes (e.g., hills), because
- (A) Temperature is low
- (B) Atmospheric pressure is low
- (C) Atmospheric pressure is high
- (D) None of these
7. Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10-2 atm, the partial pressure of B is 10-3 atm and the partial pressure of AB is 1 atm, the equilibrium constant 'K' is
- (A) 10 atm-1
- (B) 105 atm-1
- (C) 10 (dimensionless)
- (D) 105 (dimensionless)
8. The process of removal of scale formed during hot rolling of steel is termed as
- (A) Descaling
- (B) Shot blasting
- (C) Pickling
- (D) Skimming
9. Tesla meter per ampere (T. m/A) is the unit for the measurement of
- (A) Magnetic susceptibility
- (B) Magnetic moment
- (C) Permeability of free space
- (D) Flux density
10. Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is
- (A) Very low which prevents their ignition by
compression
- (B) Very high which prevents their ignition by
compression
- (C) Zero
- (D) None of these
11. The joint for soldering is supported by binding wire made of
- (A) Mild steel
- (B) Copper
- (C) Soft iron
- (D) Stainless steel
12. Which of the following is used to produce draught in the locomotive boilers?
- (A) Chimney
- (B) Induced draught fan
- (C) Forced draught fan
- (D) Steam jet arrangement
13. The bolt is subjected to _________ when the nut is tightened by putting the washer beneath it.
- (A) Tension
- (B) Shear
- (C) Compression
- (D) Bending & tension
14. Which of the following materials has the least scrap value?
- (A) Aluminium
- (B) Stainless steel
- (C) Brass
- (D) Copper
15. Temperature profile along the length of a gas-gas counter flow heat exchanger is correctly represented by