76. In a __________ rivetted joint, the rivets in the various rows are opposite to each other.
77. Generally, elliptical dished heads
78. Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.
79. The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is
80. for fully open gate valves would be
81. LMTD correction factor is used in heat exchanger design for
82. Floating head heat exchangers are used for the
83. The most common standard size of bubble caps used in industrial operation is
84. Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of __________ type.
85. In case of a continuous distillation column, increase in reflux ratio may result in the
86. In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.
87. Thickness of the frame of a plate and frame filter as compared to that of plates is
88. Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower ?
89. The thickness of heat transfer plates used in the plate type heat exchanger ranges from __________ mm, pressed in a single piece provided with grooves & corrugations.
90. Rivets are generally specified by the
91. Length to diameter ratio of most rotary driers is in the range of
92. Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.
93. Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise.
94. Ratio of tube length to shell diameter for a shell and tube heat exchanger is
95. The dust collection efficiency of a cyclone separator
96. In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to
97. Which of the following types of reactors is the safest from operation point of view ?
98. In a bag filter, the pressure drop increases directly as the
99. The LMTD correction factor (FT) is applied in __________ heat exchangers.
100. Movement of pipeline caused by thermal expansion is taken care by providing