MCQOPTIONS
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MCQOPTIONS
This section includes 324 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between ______________________ times the tank diameter? |
| A. | 1 to 1.5 |
| B. | 2.5 to 3.5 |
| C. | 4 to 5 |
| D. | 6 to 8 |
| Answer» B. 2.5 to 3.5 | |
| 252. |
For pipe flows, head is proportional to ______________ at constant capacity (where D = pipe diameter) ? |
| A. | 1/D |
| B. | 1/D2 |
| C. | 1/D5 |
| D. | D2 |
| Answer» D. D2 | |
| 253. |
For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by____________________? |
| A. | Di, opt = 3 Q0.36 ρ0.18 |
| B. | Di, opt = 3.9 Q0.45 ρ0.23 |
| C. | Di, opt = 7.6 Q0.36 ρ0.9 |
| D. | Di, opt = 3 Q0.36 ρ1.86 μ0.08 |
| Answer» B. Di, opt = 3.9 Q0.45 ρ0.23 | |
| 254. |
For identical situation, condensing film coefficient in case of a horizontal condenser is almost ______________ the value expected in case of vertical condenser? |
| A. | Half |
| B. | Twice |
| C. | Thrice |
| D. | Five times |
| Answer» D. Five times | |
| 255. |
For identical operating conditions, the pressure drop over _______________ tray is the highest out of the following? |
| A. | Sieve |
| B. | Valve |
| C. | Counter flow |
| D. | Bubble cap |
| Answer» E. | |
| 256. |
For high pressure process equipments/vessels, the connected nozzle should be____________________? |
| A. | Welded |
| B. | Screwed |
| C. | Flanged |
| D. | Brazed |
| Answer» D. Brazed | |
| 257. |
For given number of passes, pitch & tube diameter, the maximum number of tubes that can be accommodated in a shell of tripled inside diameter will be ____________ times? |
| A. | About 9 |
| B. | Considerably more than 9 |
| C. | Considerably less than 9 |
| D. | About 3 |
| Answer» C. Considerably less than 9 | |
| 258. |
For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is_________________? |
| A. | d1/(d1 + d2) |
| B. | d2/(d1 + d2) |
| C. | (d1 + d2)/d1 |
| D. | (d1 + d2)/d2 |
| Answer» B. d2/(d1 + d2) | |
| 259. |
For a given fluid, as the pipe diameter increases, the pumping cost ____________________? |
| A. | Decreases |
| B. | Increases |
| C. | Remain unaffected |
| D. | May increase or decrease depending upon whether the fluid is Newtonian or non-Newtonian |
| Answer» B. Increases | |
| 260. |
For a given design of bubble cap, the number of bubble caps to be used per tray is set by the _________________? |
| A. | Allowable gas velocity through the slots |
| B. | Plate spacing |
| C. | Diameter of the column |
| D. | All A., B. and C. |
| Answer» B. Plate spacing | |
| 261. |
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell_________________? |
| A. | Decreases upwards |
| B. | Increases upwards |
| C. | Remains same throughout |
| D. | May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell |
| Answer» B. Increases upwards | |
| 262. |
For a cylindrical vessel of moderate height, the weld joint efficiency for joints parallel to the cylindrical axis is given as 1.0; while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylindrical vessel, what value of weld joint efficiency should be used ? |
| A. | 0.8 |
| B. | 0.9 |
| C. | 1.0 |
| D. | (0.8)0.5 |
| Answer» B. 0.9 | |
| 263. |
For a cylindrical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness ? |
| A. | Hemispherical |
| B. | Ellipsoidal (2 : 1) |
| C. | Conical |
| D. | Flat plate |
| Answer» C. Conical | |
| 264. |
For a 25 mm hole drilled in plates to be riveted, the shank diameter of the rivet should be _______________ mm? |
| A. | 25 |
| B. | 23 |
| C. | 26 |
| D. | 27 |
| Answer» C. 26 | |
| 265. |
Floating head heat exchangers are used for the____________________? |
| A. | Heat transfer between corrosive fluids |
| B. | Cases where temperature difference between the shell and the tubes is more (>50°C) |
| C. | Co-current heat transfer systems |
| D. | Counter-current heat transfer systems |
| Answer» C. Co-current heat transfer systems | |
| 266. |
Flanges are connected to pipes by _______________________? |
| A. | Screwing |
| B. | Welding |
| C. | Brazing |
| D. | All A., B. and C. |
| Answer» E. | |
| 267. |
Filtration rate is affected by the________________? |
| A. | Pressure drop across the cake & filter medium |
| B. | Cake & filter medium resistance |
| C. | Area of filtering surface & the viscosity of filtrate |
| D. | All A., B. and C. |
| Answer» E. | |
| 268. |
Factor of safety (i.e., overdesign factor) in heat transfer equipments is about _____________ percent more than the actual/theoretical design factor? |
| A. | 5-10 |
| B. | 15-20 |
| C. | 30-35 |
| D. | 35-40 |
| Answer» C. 30-35 | |
| 269. |
Excessive liquid gradient on a tray may result in the______________________? |
| A. | Maldistribution of gas |
| B. | Back trapping |
| C. | Gas blowing beneath cap skit |
| D. | All A., B. and C. |
| Answer» E. | |
| 270. |
Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as ‘d’ will be__________________? |
| A. | d |
| B. | √d |
| C. | √(2πd) |
| D. | √(2d) |
| Answer» B. √d | |
| 271. |
Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, ζ = yield strength and E = modulus of elasticity) ? |
| A. | E |
| B. | ζ |
| C. | ζ/E |
| D. | E/ζ |
| Answer» D. E/ζ | |
| 272. |
_____________ dished head is the strongest of all? |
| A. | Hemispherical |
| B. | Elliptical |
| C. | Torispherical |
| D. | None of these |
| Answer» B. Elliptical | |
| 273. |
Diameter of the sieve tray column is determined by the_________________? |
| A. | Lower limit of vapour velocity |
| B. | Upper limit of the vapour velocity |
| C. | Hole diameter of the sieve tray |
| D. | Height of the plate spacing |
| Answer» C. Hole diameter of the sieve tray | |
| 274. |
Diameter of bubble caps used in high pressure columns is ______________ as compared to that used in identical vacuum columns? |
| A. | Less |
| B. | More |
| C. | Same |
| D. | Either A. or B.; no generalisation can be made |
| Answer» C. Same | |
| 275. |
Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as___________________? |
| A. | d = 1.1 t |
| B. | d = 1.6 √t |
| C. | d = 1.5 t |
| D. | d = 3 √t |
| Answer» C. d = 1.5 t | |
| 276. |
Cylindrical pressure vessels in horizontal condition is generally supported on a ________________ support? |
| A. | Lug |
| B. | Skirt |
| C. | Saddle |
| D. | Guy wire |
| Answer» D. Guy wire | |
| 277. |
Cylindrical shell thickness of rotary drier is generally _______________ mm? |
| A. | 2-3 |
| B. | 18-22 |
| C. | 6-8 |
| D. | 12-15 |
| Answer» D. 12-15 | |
| 278. |
Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have ______________ roofs? |
| A. | Conical |
| B. | Flat |
| C. | Floating |
| D. | Fixed |
| Answer» D. Fixed | |
| 279. |
Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if___________________? |
| A. | Plain carbon steel and cast iron parts are used |
| B. | Wall thickness is > 30 mm |
| C. | Material of construction is high alloy steel |
| D. | Both B. & C. |
| Answer» E. | |
| 280. |
Correct use of ‘factor of safety’ is very important in equipment design. It is defined as the ratio of the___________________? |
| A. | Ultimate stress to breaking stress |
| B. | Ultimate stress to working stress |
| C. | Working stress to ultimate stress |
| D. | None of these |
| Answer» C. Working stress to ultimate stress | |
| 281. |
Cooling water fouling factors vary in the range of 0.001 to 0.003____________________? |
| A. | (BTU/hr.ft2. °F)-1 |
| B. | (kcal/hr.m2.°C)-1 |
| C. | (W/m2.°K)-1 |
| D. | (kcal/hr. m. °C)-1 |
| Answer» B. (kcal/hr.m2.°C)-1 | |
| 282. |
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? |
| A. | Nozzle or rim |
| B. | Flared out |
| C. | Fluid in |
| D. | Ring plate |
| Answer» B. Flared out | |
| 283. |
Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height? |
| A. | 4-8 |
| B. | 17-34 |
| C. | 52-68 |
| D. | 88-105 |
| Answer» C. 52-68 | |
| 284. |
Column support for the roof of cylindrical storage tank must be provided for___________________? |
| A. | Small diameter tanks |
| B. | Large diameter tanks |
| C. | Small diameter tall tanks |
| D. | All tanks irrespective of their heights and diameters |
| Answer» C. Small diameter tall tanks | |
| 285. |
______________ closure is the weakest enclosure for cylindrical vessels? |
| A. | Hemispherical |
| B. | Torispherical |
| C. | Conical or flat plate |
| D. | Elliptical |
| Answer» D. Elliptical | |
| 286. |
Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is _____________ the longitudinal stress? |
| A. | Half |
| B. | Equal to |
| C. | Twice |
| D. | Eight times |
| Answer» D. Eight times | |
| 287. |
Bubble cap tray is the most commonly used tray in large distillation column, because______________? |
| A. | Of its flexibility and nearly constant efficiency under varying conditions of operation |
| B. | It incurs less pressure drop as compared to any other try designed for the same duty |
| C. | It eliminates the foaming and entrainment tendency during operation |
| D. | None of these |
| Answer» B. It incurs less pressure drop as compared to any other try designed for the same duty | |
| 288. |
Bubble cap plate column is___________________? |
| A. | A finite stage contactor |
| B. | Used only for distillation, not for absorption |
| C. | A differential stage contactor |
| D. | A continuous contactor |
| Answer» B. Used only for distillation, not for absorption | |
| 289. |
Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about ______________ mm? |
| A. | 10 |
| B. | 50 |
| C. | 100 |
| D. | 200 |
| Answer» D. 200 | |
| 290. |
Brass valves are usually made for pipe sizes ______________ inches? |
| A. | ≤ 1 |
| B. | ≤ 2 |
| C. | > 2.5 |
| D. | > 3.5 |
| Answer» C. > 2.5 | |
| 291. |
Baffles may be eliminated for_________________? |
| A. | Low viscosity liquids (< 200 poise) |
| B. | High viscosity liquids (> 600 poise) |
| C. | Large diameter tanks |
| D. | None of these |
| Answer» C. Large diameter tanks | |
| 292. |
Baffle width is normally taken as ______________ times the tank diameter? |
| A. | 0.1-0.12 |
| B. | 0.4-0.5 |
| C. | 0.45-0.6 |
| D. | 0.2-0.45 |
| Answer» B. 0.4-0.5 | |
| 293. |
Baffle spacing is generally _________________ the I.D. of the shell ? |
| A. | More than |
| B. | Not greater than |
| C. | Not less than one fifth of |
| D. | Both B. and C. |
| Answer» E. | |
| 294. |
Back-trapping in a distillation column results due to_________________? |
| A. | Low gas velocity |
| B. | High gas velocity |
| C. | Excessive liquid gradient over the tray |
| D. | Low reflux ratio |
| Answer» D. Low reflux ratio | |
| 295. |
At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | May increase or decrease depending upon the solubility of the gas in the liquid |
| Answer» D. May increase or decrease depending upon the solubility of the gas in the liquid | |
| 296. |
At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally ? |
| A. | Higher |
| B. | Lower |
| C. | Same |
| D. | Unpredictable |
| Answer» C. Same | |
| 297. |
Apex angle of conical heads used in the bottom heads of chemical process equipments is usually__________________? |
| A. | 30° |
| B. | 45° |
| C. | 60° |
| D. | 75° |
| Answer» D. 75° | |
| 298. |
Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of ____________________? |
| A. | Preventing the local overstressing of the shell around the opening |
| B. | Reduction of discontinuity in shape at the junction |
| C. | Making the joint leak proof |
| D. | None of these |
| Answer» B. Reduction of discontinuity in shape at the junction | |
| 299. |
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 viscosity above ____________________ poise? |
| A. | 300 |
| B. | 600 |
| C. | 1000 |
| D. | 1500 |
| Answer» C. 1000 | |
| 300. |
An under-designed steam trap will___________________? |
| A. | Waste steam |
| B. | Destroy itself of acceleration wear due to rapid recycling |
| C. | Back up condensate and cause water hammer in steam line |
| D. | None of these |
| Answer» D. None of these | |