Chemical Engineering MCQs

Page No. 238

Colebrook equation for friction factor in turbulent flow is given by, f-0.5 = -4 loge [(ε/D) + (1.26/NRe √F). It reduces to Nikuradse equation for a value of (ϵ/D) equal to __________________?


a0


b1


c


d0.5


View Answer 1

Which of the following flow measuring devices is an area meter ?


aVenturimeter


bOrificemeter


cAnemometer


dRotameter


View Answer Rotameter

Which of the following equations applies to the fluid flow through a packed bed for very large Reynolds number ?


aFanning equation


bBlake-Plummer equation


cHagen-Poiseuille equation


dKozeny-Carman equation



The energy loss in flow through Venturimeter is less than that through flow nozzle, because in case of a flow nozzle, the ?


aLength is shorter


bThroat diameter is more


cSudden expansion of flow in the downstream occurs


dDistance between the throat and the inlet is more



The valve commonly used in pipes larger than 2″ dia is a______________?


aGlobe valve


bPlug-cock


cGate valve


dCheck valve


View Answer Gate valve

The ratio of maximum to average velocity in case of streamline flow between parallel plates is______________________?


a1


b1.5


c2


d2.5


View Answer 1.5

At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump ?


a40° and 140°


b45° and 60°


c90° and 80°


d20° and 120°


View Answer 40° and 140°

For the same terminal conditions and fitting size, the least friction loss is incurred in a/an ?


aT-joint


bUnion


c45° elbow


d90°bend


View Answer Union

Glass pipes can be joined by__________________?


aFlanges


bWelding


cSoldering


dBell and spigot joint


View Answer Bell and spigot joint

The percentage slip in a reciprocating pump set is given by the % of (where, Q1 = actual discharge Q2 = theoretical discharge) ?


aQ1/Q2


bQ2/Q1


c(Q2 – Q1)/Q1


d(Q2 – Q1)/Q2


View Answer (Q2 – Q1)/Q2

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