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Hassan
1.In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as ___________________ ?
A. 1/KG = 1/KL + m/KG
B. 1/KG = 1/KG + m/KL
C. KG = 1/KG + m/KL
D. 1/KG = 1/KL + m/KG
2.Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ?
A. Humidity ratio
B. Dew point
C. Wet bulb temperature
D. Humidity ratio
3.Steam distillation is used to__________________?
A. Increase the efficiency of separation
B. Avoid thermal decomposition of a component
C. Reduce the number of plates
D. Increase the efficiency of separation
4.Leaching of coarse solid lumps is also termed as _____________________?
A. Dissolution
B. Decoction
C. Percolation
D. Dissolution
5.In Lewis equation, gear tooth is considered as
A. Simply supported beam
B. Cantilever beam
C. Curved beam
D. Simply supported beam
6. According to Lewis equation
A. Pinion is always weaker than gear
B. Pinion is weaker than gear if made of same material
C. Gear is weaker than pinion if made of same material
D. Pinion is always weaker than gear
7. Which of the following type of gears are free from axial thrust?
A. Herringbone gears
B. Bevel gears
C. Worm gears
D. Herringbone gears
8.Maximum gear ratio for a pair of spur gears is
A. 10
B. 3
C. 100
D. 10
9.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
10.Which of the following types of gear is free from interference?
A. Cycloidal gears
B. Spiral gears
C. Involute gears
D. Cycloidal gears
11.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
12. Addendum of a cycloidal gear tooth is
A. Epicycloid
B. Hypocycloid
C. Cycloid
D. Epicycloid
13. 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
14.When the axes of two shafts are perpendicular and intersecting, use
A. Spur gears
B. Bevel gears
C. Worm gears
D. Spur gears
15.Maximum efficiency of a pair of spur gears is
A. 99 %
B. 80 %
C. 50 %
D. 99 %
16. In which type of gears, slight variation in center distance does not affect velocity ratio?
A. Cycloid
B. Epicycloid
C. Involute
D. Cycloid
17.The product of diametral pitch P and circular pitch p is equal to
A. 1/π
B. π
C. π/2
D. 1/π
18.Which of the following type of gears provide maximum velocity ratio?
A. Spur gears
B. Bevel gears
C. Worm gears
D. Spur gears
19. 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
20. 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
21.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
22. 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
23.Stub tooth are provided for
A. High velocity ratios
B. High power transmitting capacity
C. Low noise
D. High velocity ratios
24.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
25.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
26.The pressure angle in involute teeth gears
A. Remains constant
B. Often changes
C. Rarely changes
D. Remains constant
27.A man can develop
A. 0.1 hp
B. 0.5 hp
C. 0.75 hp
D. 0.1 hp
28.The average force that a bullock can exert
A. 1/5th of their body weight
B. 1/10th of their body weight
C. 1/20th of their body weight
D. 1/5th of their body weight
29. Medium size bullock can develop
A. 0.50 to 0.75 hp
B. 0.75 to 1.0 hp
C. 0.75 hp to 1.1 hp
D. 0.50 to 0.75 hp
30.The thermal efficiency of diesel engine varies between
A. 25 and 32 per cent
B. 32 and 38 per cent
C. 32 and 40 per cent
D. 25 and 32 per cent
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