Practice Test: Question Set - 19
1. For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
- (A) Increases
- (B) Decreases
- (C) Remain constant
- (D) Increases to a maximum before decreasing
2. The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.
- (A) 140
- (B) 180
- (C) 240
- (D) 280
3. To improve the machinability of steel, it is generally subjected to
- (A) Spheroidising
- (B) Tempering
- (C) Normalizing
- (D) Annealing
4. Difference at any instant between the value of the controlled variable and the set point is called the
- (A) Deviation
- (B) Derivative time
- (C) Error ratio
- (D) Differential gap
5. Dephosphorization of molten pig iron is favored by
- (A) Oxidizing and basic slag
- (B) Reducing and basic slag
- (C) High activity co-efficient of phosphorous in metal
- (D) Oxidizing and neutral slag
6. Cementite is in the lamellar form in the __________ phase of steel.
- (A) Martenistic
- (B) Bainitic
- (C) Pearlitic
- (D) Ferritic
7. Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
- (A) Mach
- (B) Froude
- (C) Reynolds
- (D) Euler
8. Brazing is the joining of metals
- (A) Without melting the base metal
- (B) With a non-ferrous filler
- (C) Both (a) & (b)
- (D) Neither (a) nor (b)
9. Metal shots used in shot blasting are made of
- (A) Stellite
- (B) Steel
- (C) Bronze
- (D) Lead
10. Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of
- (A) Lumps
- (B) Pellets
- (C) Briquettes
- (D) Sinter
11. Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot
- (A) Piercing
- (B) Spinning
- (C) Drawing
- (D) Extrusion
12. Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be
- (A) 5
- (B) 1.25
- (C) 2.5
- (D) 3.75
13. A pycnometer is used for the measurement of
- (A) Flow rate of molten metal
- (B) Specific gravity of a liquid
- (C) Composition of alloys
- (D) Concentration of a solution
14. Which of the following low melting alloy containing bismuth and lead is used for electric fuse?
- (A) Wood's metal
- (B) Babbitt metal
- (C) Monel metal
- (D) Duralumin
15. Wavelength of radiation emitted by a body depends on the __________ of its surface.
- (A) Temperature
- (B) Area
- (C) Nature
- (D) All 'a', 'b' & 'c'
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