chemical engineering MCQs – Page 303

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

6041. Cold crushing strength of refractories depends upon its_________________?
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A. All A., B. and C.

B. Firing temperature

C. Composition

D. Texture

6042. Refractory bricks having lower porosity have_________________________?
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A. Low thermal conductivity

B. Greater strength

C. Low heat capacity

D. High insulating properties

6043. Drag force on the float of a Rotameter is (where Q = flow rate of the)__________________?
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A. ? ?Q

B. ? Q

C. Constant

D. ? Q2

6044. Faster rate of drying of moulded refractories results in high _____________ of refractories?
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A. Green strength

B. Voids

C. Shrinkage

D. Both B. and C.

6045. Air vessel of a reciprocating pump is initially filled with___________________?
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A. Atmospheric air

B. Water

C. None of these

D. Compressed air

6046. Carbon refractory blocks ___________________?
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A. Are wetted by molten iron

B. Are acidic in nature

C. Are used in the hearth of blast furnace

D. All A., B. and C.

6047. Tar bonded dolomite bricks__________________?
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A. Are used in outer lining of L.D. converters

B. All A., B. and C.

C. Are stored under controlled temperature & humidity to avoid hydration

D. Have poorer hydration resistance than pitch bonded bricks

6048. Pressure drop for turbulent fluid flow through a circular pipe is given by_________________?
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A. 64/Re

B. 32?LV/gc.D2

C. 4f (L/D) (v2/2gc). ?

D. f (L/D) (v2/2gc). ?

6049. Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around________________?
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A. 100

B. 1000

C. 2000

D. 10

6050. Bernoullis equation is not applicable, when the flow is___________________?
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A. Irrotational

B. Viscous

C. All A., B. & C.

D. Incompressible

6051. The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/?f)-0.4, is called the _____________ equation?
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A. Nikuradse

B. Blasius

C. Von-Karman

D. Colebrook

6052. Sillimanite is a _____________ refractory?
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A. Basic

B. Neutral

C. Insulating

D. High alumina

6053. Purpose of relief valve in a reciprocating pump is to___________________?
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A. Facilitate unidirectional flow of liquid

B. Control the rate of discharge

C. Protect the pump against developing excessive pressure

D. Reduce the discharge pressure

6054. The largest consumer of refractories is the _______________ industry?
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A. Power

B. Metallurgical

C. Fertiliser

D. Cement

6055. Chromite refractories are_____________________?
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A. Acidic refractory

B. Fired at a temperature of 600C only

C. Basic refractory

D. Neutral refractory

6056. Pascal law is not applicable for a/an ________________________ fluid?
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A. Static

B. None of these

C. Accelerating frictionless

D. Uniformly moving

6057. With decrease in porosity, the ______________ of the refractories decreases?
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A. Strength

B. Spalling resistance

C. Thermal conductivity

D. None of these

6058. As per Newtons law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to (where, ? = fluid viscosity) ?
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A. 1/?2

B. ?2

C. 1/?

D. ?

6059. For steady ideal fluid flow, the Bernoullis equation states that the_________________?
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A. Energy is constant along a stream line, but may vary across stream lines

B. None of these

C. Velocity is constant along a stream line

D. Energy is constant throughout the fluid

6060. Spalling resistance of a refractory cannot be increased by ____________________?
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A. Making it denser

B. Decreasing its thermal co-efficient of expansion

C. Using a coarser grog during its manufacture

D. Increasing its porosity

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