8247 + Mcqs in Chemical Engineering Page 153 McqOptions

7601.	A pipeline buried in soil is commonly protected from corrosion by
A.	anodic protection.
B.	cathodic protection.
C.	using inhibitors.
D.	using a special alloy resistant to corrosion.
Answer» C. using inhibitors.

Discussion

7602.	Circulation of liquid metal (i.e. molten sodium) in a liquid metal cooled nuclear reactor is done by a/an __________ pump.
A.	electromagnetic
B.	axial flow
C.	diaphragm
D.	reciprocating
Answer» B. axial flow

Discussion

7603.	Titanium is produced by __________ of Ti Cl4.
A.	electrolytic reduction
B.	calcium reduction
C.	magnesium reduction
D.	thermal dissociation
Answer» D. thermal dissociation

Discussion

7604.	__________ strain gauge is the most sensitive sensing element for strain measurement.
A.	photoelastic
B.	semiconductor
C.	wire resistance
D.	none of these
Answer» C. wire resistance

Discussion

7605.	A simple closed grinding circuit may consist of
A.	a ball mill and a classifier.
B.	a rod mill and a hydrocyclone.
C.	a jaw crusher and a hydrocyclone.
D.	a ball mill and a froth floatation cell.
Answer» B. a rod mill and a hydrocyclone.

Discussion

7606.	The type of water filter normally employed/ preferred for treating small quantities of water in railway stations and individual industries is the __________ filter.
A.	rapid sand
B.	pressure
C.	gravity
D.	slow sand.
Answer» C. gravity

Discussion

7607.	Refrigerative cooling employed during long distance transportation of food stuffs is normally done by
A.	ice
B.	liquid nitrogen
C.	liquid oxygen
D.	vacuum evaporation
Answer» C. liquid oxygen

Discussion

7608.	Internal cracks in drawn bars are due to
A.	secondary tensile stresses.
B.	temperature gradient in the work piece.
C.	heated dies and grips.
D.	internal compressive residual stress.
Answer» B. temperature gradient in the work piece.

Discussion

7609.	The radioactive isotope of hydrogen is
A.	deuterium
B.	tritium
C.	protium
D.	none of these
Answer» C. protium

Discussion

7610.	What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m. K respectively.
A.	2
B.	5
C.	10
D.	20
Answer» B. 5

Discussion

7611.	Which set of materials is used as a moderator in nuclear reactor ?
A.	Zircalloy & berrylium.
B.	Zircalloy & heavy water.
C.	Zirconium & berrylium.
D.	Heavy water & berrelium.
Answer» E.

Discussion

7612.	Malleabilisation heat treatment is performed on
A.	cast steel
B.	grey cast iron
C.	white cast iron
D.	spheroidal graphite cast iron
Answer» D. spheroidal graphite cast iron

Discussion

7613.	For hardening high alloy steel, it is to be heated slowly and uniformly to avoid
A.	local hardening
B.	scale formation
C.	segregation
D.	warpage
Answer» E.

Discussion

7614.	Addition of __________ to steel can not impart it high strength at elevated temperature.
A.	nickel
B.	magnesium
C.	silicon
D.	manganese
Answer» C. silicon

Discussion

7615.	Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?
A.	Quartz
B.	Flourspar
C.	Dolomite
D.	Manganese ore
Answer» C. Dolomite

Discussion

7616.	1% concentration of water vapor in air is equivalent to __________ ppm (parts per million).
A.	10000
B.	1000
C.	100
D.	10
Answer» B. 1000

Discussion

7617.	The ratio of coil diameter to wire diameter of a spring is called the spring
A.	index
B.	deflection
C.	form co-efficient
D.	none of these
Answer» B. deflection

Discussion

7618.	Grinding wheel made of silicon carbide is most suitable for grinding materials of low tensile strength (e.g; tough bronze). Grinding is a __________ operation.
A.	turning
B.	dressing
C.	forming
D.	surface finishing
Answer» E.

Discussion

7619.	Which of the following is the most effective inhibitor of grain growth, when added in small quantity in steel ?
A.	Manganese
B.	Vanadium
C.	Cobalt
D.	Copper
Answer» C. Cobalt

Discussion

7620.	A controller action in which there is a con-tinous relation between the values of controlled variable and the rate of change of conrolled output signal is called the __________ action.
A.	proportional
B.	integral
C.	derivative
D.	none of these
Answer» C. derivative

Discussion

7621.	When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the
A.	partial pressure of water vapour is less than the total pressure.
B.	humidity is < 100% & dew point temperature of air has not reached.
C.	dew point temperature of air has not reached & air is not saturated fully.
D.	air is fully saturated.
Answer» E.

Discussion

7622.	An engineer's hammer is made of high __________ steel.
A.	carbon
B.	speed
C.	silicon
D.	chromium
Answer» B. speed

Discussion

7623.	Impeller & casing of centrifugal pump handling corrosive liquid and frequently running under cavitation condition is most prone to __________ corrosion.
A.	uniform
B.	oxygen diffusion
C.	pitting
D.	inter-granular
Answer» D. inter-granular

Discussion

7624.	Isotropic materials have the same __________ in all the directions.
A.	thermal properties
B.	elastic properties
C.	stresses
D.	all (a), (b) & (c)
Answer» C. stresses

Discussion

7625.	The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
A.	ambient
B.	dry bulb
C.	dew point
D.	wet bulb
Answer» D. wet bulb

Discussion

7626.	Dialysis is the process of separating substances in the
A.	colloidal state from those present in the true solutions.
B.	colloidal state from those present in the suspensions.
C.	suspension from those present in the solutions.
D.	none of these.
Answer» B. colloidal state from those present in the suspensions.

Discussion

7627.	Which of the following alloying elements reduces the formation of iron sulphide in steel ?
A.	Cobalt
B.	Nickel
C.	Manganese
D.	Vanadium
Answer» C. Manganese

Discussion

7628.	In age-hardenable alloys, maximum ductility is obtained
A.	in as cast state.
B.	immediately after solution treatment and subsequent quenching.
C.	after optimum ageing.
D.	after overageing.
Answer» D. after overageing.

Discussion

7629.	Prandtl mixing length in turbulent flow signifies the
A.	average distance perpendicular to the mean flow covered by the mixing particles.
B.	wavelength corresponding to the lowest frequency present in the flow field.
C.	ratio of mean free path to characteristic length of the flow field.
D.	magnitude of turbulent kinetic energy.
Answer» B. wavelength corresponding to the lowest frequency present in the flow field.

Discussion

7630.	Magnesium addition to cast iron increases its
A.	corrosion resistance.
B.	creep strength.
C.	ductility and strength in tension.
D.	hardness.
Answer» D. hardness.

Discussion

7631.	The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2 .
A.	273.15
B.	225.65
C.	100.03
D.	373.15
Answer» C. 100.03

Discussion

7632.	Value of a material is usually considered as a relationship between
A.	cost and profit.
B.	utility and appearance.
C.	utility and cost.
D.	reliability and utility.
Answer» D. reliability and utility.

Discussion

7633.	Hard magnetic materials have high
A.	coercive force.
B.	residual magnetic induction.
C.	both 'a' & 'b'.
D.	neither 'a' nor 'b'.
Answer» D. neither 'a' nor 'b'.

Discussion

7634.	The difference in the properties of a substance in three states of matter depends upon the
A.	binding energy of atoms.
B.	difference in molecular shape.
C.	difference in intermolecular forces.
D.	none of these.
Answer» D. none of these.

Discussion

7635.	Ignition of fuel in a diesel engine is by
A.	spark
B.	hot compressed air
C.	fuel injection
D.	none of these
Answer» C. fuel injection

Discussion

7636.	Which of the following is not an ore of zinc?
A.	Cerrusite
B.	Franklinite
C.	Calamine
D.	Troosite
Answer» B. Franklinite

Discussion

7637.	Phosphorous is added to copper melt to
A.	remove hydrogen.
B.	deoxidise the metal.
C.	improve fluidity.
D.	reduce shrinkage.
Answer» B. deoxidise the metal.

Discussion

7638.	Which of the following is not a suitable solid lubricant ?
A.	Talc
B.	Molybdenum disulphide
C.	Graphite
D.	None of these
Answer» E.

Discussion

7639.	The standard instrument used for calibrating the load applied by universal testing machine is called
A.	extensometer
B.	spring balace
C.	dynamometer
D.	none of these
Answer» E.

Discussion

7640.	The reductant used in the extraction of magnesium from calcined dolomite via Pidgeon's process is
A.	pure carbon
B.	pure silicon
C.	ferro silicon
D.	ferro manganese
Answer» D. ferro manganese

Discussion

7641.	The leg of a barometric leg pump is longer than the Toricellian leg, which is about __________ metres.
A.	1
B.	5
C.	34
D.	10
Answer» E.

Discussion

7642.	The moment of inertia of a body comes into play in __________ motion.
A.	curvilinear
B.	linear
C.	rotational
D.	none of these
Answer» D. none of these

Discussion

7643.	Thermoplastics are never moulded using
A.	injection moulding
B.	blow moulding
C.	extrusion
D.	compression moulding
Answer» E.

Discussion

7644.	Pick out the wrong statement. If the net positive suction head (NPSH) requirement of a pump is not satisfied, then
A.	it will deliver low discharge of liquid.
B.	its efficiency will not be affected.
C.	it will not develop sufficient head to raise water.
D.	it will be cavitated.
Answer» C. it will not develop sufficient head to raise water.

Discussion

7645.	While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
A.	low impact strength.
B.	high flexibility.
C.	better finish and surface appearance.
D.	high plastic deformation.
Answer» B. high flexibility.

Discussion

7646.	The stress at which a metal fails by fatigue lies
A.	near the fracture point of the stress-strain curve.
B.	in the plastic range.
C.	in the elastic range.
D.	none of these.
Answer» D. none of these.

Discussion

7647.	"Encyclopaedia of Chemical Technology" has been
A.	authored by Kirk Othmer.
B.	edited by Perry and Chilton.
C.	edited by Kirk Othmer.
D.	authored by Perry and Chilton.
Answer» D. authored by Perry and Chilton.

Discussion

7648.	Statistical quality control was developed by __________ , an American scientist during world war II.
A.	Water shewhart
B.	Fredric Taylor
C.	John Wright
D.	Woolmer
Answer» B. Fredric Taylor

Discussion

7649.	Surface tension of a liquid
A.	is due to intermolecular forces of cohesion.
B.	decreases with rise in temperature.
C.	is responsible for the spherical shape of an isolated liquid drop.
D.	all (a), (b) & (c).
Answer» E.

Discussion

7650.	A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is
A.	-0.8
B.	0.8
C.	+0.08
D.	-0.24
Answer» E.

Discussion

Explore topic-wise MCQs in Engineering.

A pipeline buried in soil is commonly protected from corrosion by

Circulation of liquid metal (i.e. molten sodium) in a liquid metal cooled nuclear reactor is done by a/an __________ pump.

Titanium is produced by __________ of Ti Cl4.

__________ strain gauge is the most sensitive sensing element for strain measurement.

A simple closed grinding circuit may consist of

The type of water filter normally employed/ preferred for treating small quantities of water in railway stations and individual industries is the __________ filter.

Refrigerative cooling employed during long distance transportation of food stuffs is normally done by

Internal cracks in drawn bars are due to

The radioactive isotope of hydrogen is

What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m. K respectively.

Which set of materials is used as a moderator in nuclear reactor ?

Malleabilisation heat treatment is performed on

For hardening high alloy steel, it is to be heated slowly and uniformly to avoid

Addition of __________ to steel can not impart it high strength at elevated temperature.

Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?

1% concentration of water vapor in air is equivalent to __________ ppm (parts per million).

The ratio of coil diameter to wire diameter of a spring is called the spring

Grinding wheel made of silicon carbide is most suitable for grinding materials of low tensile strength (e.g; tough bronze). Grinding is a __________ operation.

Which of the following is the most effective inhibitor of grain growth, when added in small quantity in steel ?

A controller action in which there is a con-tinous relation between the values of controlled variable and the rate of change of conrolled output signal is called the __________ action.

When dry bulb temperature &amp; wet bulb temperature of moist air is the same, it means that the

An engineer's hammer is made of high __________ steel.

Impeller &amp; casing of centrifugal pump handling corrosive liquid and frequently running under cavitation condition is most prone to __________ corrosion.

Isotropic materials have the same __________ in all the directions.

The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.

Dialysis is the process of separating substances in the

Which of the following alloying elements reduces the formation of iron sulphide in steel ?

In age-hardenable alloys, maximum ductility is obtained

Prandtl mixing length in turbulent flow signifies the

Magnesium addition to cast iron increases its

The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2 .

Value of a material is usually considered as a relationship between

Hard magnetic materials have high

The difference in the properties of a substance in three states of matter depends upon the

Ignition of fuel in a diesel engine is by

Which of the following is not an ore of zinc?

Phosphorous is added to copper melt to

Which of the following is not a suitable solid lubricant ?

The standard instrument used for calibrating the load applied by universal testing machine is called

The reductant used in the extraction of magnesium from calcined dolomite via Pidgeon's process is

The leg of a barometric leg pump is longer than the Toricellian leg, which is about __________ metres.

The moment of inertia of a body comes into play in __________ motion.

Thermoplastics are never moulded using

Pick out the wrong statement. If the net positive suction head (NPSH) requirement of a pump is not satisfied, then

While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the

The stress at which a metal fails by fatigue lies

"Encyclopaedia of Chemical Technology" has been

Statistical quality control was developed by __________ , an American scientist during world war II.

Surface tension of a liquid

A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is

When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

Impeller & casing of centrifugal pump handling corrosive liquid and frequently running under cavitation condition is most prone to __________ corrosion.