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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