Chemical Engineering :: All Aptitude Test ::

1. Which of the following type of gears are free from axial thrust?
A. Herringbone gears
B. Bevel gears
C. Worm gears
D. Herringbone gears

2.Maximum gear ratio for a pair of spur gears is
A. 10
B. 3
C. 100
D. 10

3.The working depth for a pair of gears is given by
A. Addendum plus dedendum
B. Twice the addendum
C. Twice the dedendum
D. Addendum plus dedendum

4.Which of the following types of gear is free from interference?
A. Cycloidal gears
B. Spiral gears
C. Involute gears
D. Cycloidal gears

5.Backlash is
A. Sum of the clearances of pinion and gear teeth
B. The amount by which the width of a tooth space exceeds the thickness of meshing tooth on pitch circle
C. Difference between the pitch circles of meshing gears
D. Sum of the clearances of pinion and gear teeth

6. Addendum of a cycloidal gear tooth is
A. Epicycloid
B. Hypocycloid
C. Cycloid
D. Epicycloid

7. Buckingham’s equation of gear tooth is based on
A. Maximum crushing stress in gear tooth
B. Maximum bending stress in gear tooth
C. Maximum shear stress in gear tooth
D. Maximum crushing stress in gear tooth

8.When the axes of two shafts are perpendicular and intersecting, use
A. Spur gears
B. Bevel gears
C. Worm gears
D. Spur gears

9.Maximum efficiency of a pair of spur gears is
A. 99 %
B. 80 %
C. 50 %
D. 99 %

10. In which type of gears, slight variation in center distance does not affect velocity ratio?
A. Cycloid
B. Epicycloid
C. Involute
D. Cycloid

11.The product of diametral pitch P and circular pitch p is equal to
A. 1/π
B. π
C. π/2
D. 1/π

12.Which of the following type of gears provide maximum velocity ratio?
A. Spur gears
B. Bevel gears
C. Worm gears
D. Spur gears

13. In case of spur gears, increasing pressure angle results in
A. Weaker teeth
B. Bigger size of gear
C. Higher pitch line velocity
D. Weaker teeth

14. Beam strength of gear tooth is
A. Maximum tangential force that the tooth can transmit without bending failure
B. Maximum bending stress that the tooth can transmit without failure
C. Maximum tangential force that the tooth can transmit without pitting failure
D. Maximum tangential force that the tooth can transmit without bending failure

15.In case of cycloidal tooth gears, which of the following statement is correct?
A. Simple to manufacture
B. Pressure angle remains constant
C. No interference occurs between meshing teeth
D. Simple to manufacture

16. The tooth thickness of an involute gear in terms of module ‘m’ is
A. 1.157 m
B. 1.5 m
C. 2 m
D. 1.157 m

17.Stub tooth are provided for
A. High velocity ratios
B. High power transmitting capacity
C. Low noise
D. High velocity ratios

18.Dynamic force on gear tooth is induced due to
A. Inaccuracies of tooth profile and errors in tooth spacing
B. Misalignment in bearings
C. Elasticity of parts and inertia of rotating masses
D. Inaccuracies of tooth profile and errors in tooth spacing

19.The interference in cycloidal tooth gears
A. Depends upon pressure angle
B. Depends upon number of teeth
C. Is completely absent
D. Depends upon pressure angle

20.The pressure angle in involute teeth gears
A. Remains constant
B. Often changes
C. Rarely changes
D. Remains constant

21.Raw materials for nitric acid manufacture are____?
A. Hydrogen peroxide, air and water
B. Anhydrous ammonia and air
C. Anhydrous ammonia, air and water
D. Hydrogen peroxide, air and water

22.Plant tranquillisers____?
A. Hold back stem growth and halt plants at a desired height
B. Cause early maturation of plants
C. Accelerate ripening of food and grain
D. Hold back stem growth and halt plants at a desired height

23.Nitrogen content of a nitrogenous fertiliser is 35%. It could be?
A. Urea
B. Ammonium nitrate
C. Calcium ammonium nitrate (CAN)
D. Urea

24.Nitrogen content of urea is about _______ percent ?
A. 10
B. 46
C. 80
D. 10

25.With increases in pressure, the conversion of Ammonium carbamate into urea?
A. Increases
B. Decreases
C. Remains unaltered
D. Increases

26.Nitric acid is produced on commercial scale in a fertiliser plant by?
A. Oxidation of ammonia
B. CaNO3 + H2SO4 reaction
C. Passing air through high voltage electric arc
D. Oxidation of ammonia

27.In ammonia synthesis (N2 + 3H2 = 2NH3), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at?
A. Low pressure
B. High pressure
C. Very high temperature
D. Low pressure

28.Reaction of anhydrous liquid ammonia with ortho-phosphoric acid produces?
A. Ammonium phosphate
B. Superphosphate
C. Triple superphosphate
D. Ammonium phosphate

29.H4P2O7 is the chemical formula of ______ phosphoric acid?
A. Pyro
B. Ortho
C. Meta
D. Pyro

30.Catalytic ammonia synthesis reaction as in Haber�s process is___?
A. Endothermic
B. Exothermic
C. Irreversible
D. Endothermic


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