Practice Test: Question Set - 21
1. Runge-Kutta method is used to solve a/an
- (A) Ordinary differential equation of nth order
- (B) Simultaneous non-linear equation
- (C) Linear differential equation
- (D) None of these
2. Which of the following fastening devices has a head at one end and a nut fitted to the other?
- (A) Bolt
- (B) Stud
- (C) Top bolt
- (D) None of these
3. Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.
- (A) Working
- (B) Bearing
- (C) Yield
- (D) None of these
4. __________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten.
- (A) Stellite
- (B) High speed steel
- (C) Cermet
- (D) Alnico
5. Chromium molybdenum steel cannot be welded using __________ welding.
- (A) Thermit
- (B) Electrical resistance
- (C) Oxy-acetylene
- (D) Any of these
6. The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.
- (A) 0.2
- (B) 0.4
- (C) 0.6
- (D) 0.8
7. Nitriding of a steel part does not increase its
- (A) Grain size
- (B) Fatigue limit
- (C) Surface hardness
- (D) Wear resistance
8. Which one of the following is incombustible?
- (A) H2
- (B) CCl4
- (C) C2H2
- (D) S
9. Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
- (A) Conduction
- (B) Convection
- (C) Radiation
- (D) Both 'a' & 'b'
10. As the fluid flow rate increases, the float of the Rotameter
- (A) Rises in the tube
- (B) Rotates at higher speed
- (C) Rotates at lower speed
- (D) Drops down in the tube
11. Evaporative cooling process employs a combination of cooling and humidification in which the
- (A) Sensible heat is added
- (B) Sensible heat is removed and the latent heat is added
- (C) Latent heat is removed
- (D) Sensible heat is added and latent heat is removed
12. High speed steel tools retain their hardness upto a temperature of __________ °C.
- (A) 500
- (B) 750
- (C) 900
- (D) 1100
13. Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called
- (A) Tempering
- (B) Hardening
- (C) Annealing
- (D) Normalizing
14. Pick out the wrong statement.
- (A) A ferromagnetic material becomes paramagnetic above the 'Curie
temperature'
- (B) Permanent magnets are made of hard materials, whereas electromagnets
require soft magnetic materials
- (C) Soft magnetic materials (e.g., pure iron) have
higher permeability and low hysterisis loss and coercive forces
- (D) Tungsten steel and alnico are not hard magnetic materials
15. The elastic strain in copper is due to the
- (A) Motion of dislocations
- (B) Stretching of atomic bonds
- (C) Breakage of atomic bonds
- (D) None of the above
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