8247 + Mcqs in Chemical Engineering Page 142 McqOptions

7051.	In chemical dehumidification of air
A.	both specific humidity & dry bulb temperature increases.
B.	both specific humidity & dry bulb temperature decreases.
C.	specific humidity decreases & dry bulb temperature increases.
D.	specific humidity increases & dry bulb temperature decreases.
Answer» D. specific humidity increases & dry bulb temperature decreases.

Discussion

7052.	What is the pH of distilled water ?
A.	0
B.	1
C.	7
D.	14
Answer» D. 14

Discussion

7053.	The process by which fine solids is removed from liquids is termed as
A.	decantation
B.	flocculation
C.	sedimentation
D.	classification
Answer» D. classification

Discussion

7054.	Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?
A.	Bond's crushing law
B.	Kick's law
C.	Rittinger's law
D.	None of these.
Answer» D. None of these.

Discussion

7055.	Direct conversion of thermal energy to electrical energy is facilitated by the
A.	fuel cells.
B.	photo voltaic cell.
C.	magneto hydrodynamic generator.
D.	none of these.
Answer» D. none of these.

Discussion

7056.	The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.
A.	0.2
B.	0.4
C.	0.6
D.	0.8
Answer» B. 0.4

Discussion

7057.	Angular displacement can be measured suitably by a
A.	shaft encoder.
B.	linear variable differential transducer (LVDT).
C.	stroboscope.
D.	tachometer.
Answer» B. linear variable differential transducer (LVDT).

Discussion

7058.	Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
A.	wet bulb
B.	dry bulb
C.	saturation
D.	dew point
Answer» B. dry bulb

Discussion

7059.	Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
A.	conduction
B.	convection
C.	both 'a' & 'b'
D.	radiation
Answer» E.

Discussion

7060.	Shell and leaf filter as compared to plate and frame filter
A.	entails less labor cost.
B.	facilitates filtration under higher pressure.
C.	provides more effective washing.
D.	all (a), (b) & (c)
Answer» E.

Discussion

7061.	__________ mills fall in the category of tumbling mills,
A.	Ball and pebble
B.	Rod and tube
C.	Compartment
D.	all (a), (b) & (c)
Answer» E.

Discussion

7062.	Which of the following is not a cutting machine?
A.	Dicers
B.	Knife cutters
C.	Slitters
D.	Tube mills
Answer» E.

Discussion

7063.	Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.
A.	viscosity
B.	thermal conductivity
C.	surface tension
D.	density
Answer» E.

Discussion

7064.	In connection with corrosion of metals, passivation is the process that
A.	intensifies deterioration.
B.	changes the composition of the metal.
C.	inhibits further deterioration.
D.	none of these.
Answer» D. none of these.

Discussion

7065.	With increase in impurities in metals, their corrosion resistances
A.	increase
B.	decrease
C.	remain same
D.	may increase or decrease ; depending on the type of metal
Answer» C. remain same

Discussion

7066.	Most important property of steels for use in automobile bodies is the
A.	formability
B.	yield strength
C.	toughness
D.	resilience
Answer» B. yield strength

Discussion

7067.	Consideration of the creep is the most important in case of the
A.	blades of gas turbine.
B.	piston of an I. C. engine.
C.	flywheel of steam engine.
D.	cycle chain.
Answer» B. piston of an I. C. engine.

Discussion

7068.	The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system
A.	is as light as possible.
B.	has very high C.O.P.
C.	employs minimum quantity of refrigerant.
D.	consumer minimum horse power.
Answer» B. has very high C.O.P.

Discussion

7069.	Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its
A.	lower cost.
B.	abundant availability.
C.	resistance to vegetable acids as the tin plate are commercially used in 'canning' industry.
D.	none of these.
Answer» D. none of these.

Discussion

7070.	Which of the following is resistant to the action of both heat & chemicals ?
A.	Boro silicate glass,
B.	Silica glass.
C.	Soda lime glass.
D.	none of these.
Answer» B. Silica glass.

Discussion

7071.	The emf of a Deniell cell can be increased by
A.	decreasing the surface area of the electrodes.
B.	increasing the concentration of zinc sulphate solution.
C.	increasing the surface area of the electrodes.
D.	increasing the concentration of copper sulphate solution.
Answer» E.

Discussion

7072.	A hot short metal is
A.	hard when hot.
B.	brittle when cold.
C.	brittle when hot.
D.	brittle under all conditions.
Answer» D. brittle under all conditions.

Discussion

7073.	Corrosion rate can not be lowered by reducing the __________ of the corroding medium.
A.	concentration
B.	velocity
C.	temperature
D.	none of these
Answer» B. velocity

Discussion

7074.	Routing in production, planning & control is concerned with the
A.	sequence of operation to be performed.
B.	progress of work performed.
C.	authorisation of work to be performed.
D.	balancing of load on machines.
Answer» B. progress of work performed.

Discussion

7075.	A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.
A.	6
B.	18
C.	38
D.	52
Answer» C. 38

Discussion

7076.	Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is
A.	R ln 2
B.	-R ln 2
C.	3 R ln 2
D.	-3R ln 2
Answer» B. -R ln 2

Discussion

7077.	Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.
A.	hexagonal close, packed (hcp)
B.	face centred cubic (fcc)
C.	body centred cubic (bcc)
D.	simple cubic
Answer» E.

Discussion

7078.	__________ can replace tungsten in high speed steel.
A.	Chromium
B.	Vanadium
C.	Cobalt
D.	Molybdenum
Answer» D. Molybdenum

Discussion

7079.	Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
A.	300
B.	800
C.	1400
D.	2000
Answer» D. 2000

Discussion

7080.	Fatigue strength of a material can not be increased by
A.	cold working
B.	hot working
C.	shot peening
D.	any of these
Answer» C. shot peening

Discussion

7081.	Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal
A.	tensile strength.
B.	compressive strength.
C.	Young's modulus.
D.	thermal co-efficient of expansion.
Answer» E.

Discussion

7082.	Out of the following the refractive index is the highest for
A.	glass
B.	diamond
C.	brine
D.	kerosene
Answer» C. brine

Discussion

7083.	Cadmium in zinc leach liquor is removed by cementation using
A.	zinc
B.	iron
C.	nickel
D.	copper
Answer» B. iron

Discussion

7084.	Adhesives
A.	can't be used in the form of pressure sensitive tapes.
B.	can't join two dissimilar metals.
C.	cure instantaneously after application on a surface.
D.	none of these.
Answer» E.

Discussion

7085.	In a counter flow heat exchanger, hot fluid enters at 170 C & leaves at 150 C, while the cold fluid enters at 50 C & leaves at 70 C. The arithmetic mean temperature difference in this case is __________ C.
A.	20
B.	60
C.	120
D.
Answer» E.

Discussion

7086.	Normalising of a casting does not
A.	induce stresses in it.
B.	refine its grain structure.
C.	reduce seggregation.
D.	improve its mechanical properties.
Answer» B. refine its grain structure.

Discussion

7087.	The swift cup test evaluates the following property of a sheet metal.
A.	Stretchability
B.	Drawability
C.	Bendability
D.	None of these
Answer» C. Bendability

Discussion

7088.	__________ is the most important element, which controls the physical properties of steel.
A.	Manganese
B.	Silicon
C.	Carbon
D.	Vanadium
Answer» D. Vanadium

Discussion

7089.	Which of the following approaches the ideal gas behaviour most closely ?
A.	Wet steam
B.	Saturated steam
C.	Superheated steam
D.	Saturated water
Answer» D. Saturated water

Discussion

7090.	Which of the following is not the function of a volute casing provided in a centrifugal pump ?
A.	To reduce the head loss in discharge.
B.	To increase the pump efficiency.
C.	To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity.
D.	To increase the pump discharge rate.
Answer» E.

Discussion

7091.	Joining of thin foils is preferred to be done by
A.	gamma rays
B.	X-rays
C.	microwaves
D.	gas welding
Answer» D. gas welding

Discussion

7092.	Which of the following metals reacts violently with water ?
A.	Mercury
B.	Sodium
C.	Calcium
D.	Magnesium
Answer» C. Calcium

Discussion

7093.	A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
A.	increase.
B.	decrease.
C.	remain unaffected.
D.	may increase or decrease; depends on the thickness of each layer.
Answer» D. may increase or decrease; depends on the thickness of each layer.

Discussion

7094.	Damage to metal surface by mechanical action is called
A.	pitting
B.	corrosion
C.	erosion
D.	none of these
Answer» D. none of these

Discussion

7095.	The escape velocity of a body on earth which is independent of its mass is about __________ km/second.
A.	3
B.	7
C.	11
D.	15
Answer» D. 15

Discussion

7096.	The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?
A.	Lead
B.	Copper
C.	Aluminium
D.	Wrought iron
Answer» B. Copper

Discussion

7097.	Particle nature of cathode rays is proved due to the fact that they
A.	travel in a straight line.
B.	get deflected by magnetic electric field.
C.	produce fluorescence.
D.	heat the exposed material.
Answer» C. produce fluorescence.

Discussion

7098.	The most commonly used moderator in nuclear power plants is
A.	graphite
B.	light water
C.	heavy water
D.	berellium
Answer» B. light water

Discussion

7099.	Babbit lining is used on brass/bronze bearings to increase the
A.	antifriction properties.
B.	compressive strength.
C.	bearing resistance.
D.	wear resistance.
Answer» E.

Discussion

7100.	The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong
A.	base and strong acid.
B.	base and weak acid.
C.	acid and weak base.
D.	none of these.
Answer» B. base and weak acid.

Discussion

Explore topic-wise MCQs in Engineering.

In chemical dehumidification of air

What is the pH of distilled water ?

The process by which fine solids is removed from liquids is termed as

Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?

Direct conversion of thermal energy to electrical energy is facilitated by the

The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.

Angular displacement can be measured suitably by a

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.

Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by

Shell and leaf filter as compared to plate and frame filter

__________ mills fall in the category of tumbling mills,

Which of the following is not a cutting machine?

Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.

In connection with corrosion of metals, passivation is the process that

With increase in impurities in metals, their corrosion resistances

Most important property of steels for use in automobile bodies is the

Consideration of the creep is the most important in case of the

The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system

Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its

Which of the following is resistant to the action of both heat &amp; chemicals ?

The emf of a Deniell cell can be increased by

A hot short metal is

Corrosion rate can not be lowered by reducing the __________ of the corroding medium.

Routing in production, planning &amp; control is concerned with the

A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.

Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is

Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.

__________ can replace tungsten in high speed steel.

Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.

Fatigue strength of a material can not be increased by

Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal

Out of the following the refractive index is the highest for

Cadmium in zinc leach liquor is removed by cementation using

Adhesives

In a counter flow heat exchanger, hot fluid enters at 170 C &amp; leaves at 150 C, while the cold fluid enters at 50 C &amp; leaves at 70 C. The arithmetic mean temperature difference in this case is __________ C.

Normalising of a casting does not

The swift cup test evaluates the following property of a sheet metal.

__________ is the most important element, which controls the physical properties of steel.

Which of the following approaches the ideal gas behaviour most closely ?

Which of the following is not the function of a volute casing provided in a centrifugal pump ?

Joining of thin foils is preferred to be done by

Which of the following metals reacts violently with water ?

A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will

Damage to metal surface by mechanical action is called

The escape velocity of a body on earth which is independent of its mass is about __________ km/second.

The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?

Particle nature of cathode rays is proved due to the fact that they

The most commonly used moderator in nuclear power plants is

Babbit lining is used on brass/bronze bearings to increase the

The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong

Which of the following is resistant to the action of both heat & chemicals ?

Routing in production, planning & control is concerned with the

In a counter flow heat exchanger, hot fluid enters at 170 C & leaves at 150 C, while the cold fluid enters at 50 C & leaves at 70 C. The arithmetic mean temperature difference in this case is __________ C.