Ammonia leakage in the refrigeration system is detected by

sulphur stick, which on detection gives white smoke.

By X-ray diffraction, it is not possible to determine the

ordered arrangement of magnetic moments.

For a spontaneous natural process at constant temperature and pressure, the free energy of the system always

increases to a maximum before decreasing.

Floating control action

changes the position of the final control element from on to off.

moves the final control element at constant speed in either direction in response to an error signal.

changes the position of the final control element from on to off.

is used to counteract rapid load changes.

fully opens the final control element, when the measured variable is below the set point.

fully closes the final control element, when the measured variable is above the set point.

is a two position control (fully open or fully closed) control adequate to control a process with slow reaction and minimum dead time or transfer lag.

Multistage compression is necessary for high efficiency,

when large amount of gas is to be compressed.

if the ratio of the delivery pressure to the intake pressure exceeds 5:1.

when large amount of gas is to be compressed.

when the delivered gas is desired at very high velocity.

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

condenser can act as a storage unit for condensed steam.

compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller.

maintaining vacuum on tube side is more difficult than that on the shell side.

water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.

condenser can act as a storage unit for condensed steam.

The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.

either (a), (b) or (c); depends on the size of atom

contain not even traces of sulphur & phosphorous.

are produced by L.D. process only.

contain minimum impurity level.

Function of blow down valve in a boiler is to

empty the boiler during shutdown.

keep the drum pressure constant.

drain out the sludge from the drum.

empty the boiler during shutdown.

During solid state sintering of powders, the following mechanism can be active.

Liquid formation in grain boundaries.

Solid state diffusion processes.

Liquid formation in grain boundaries.

Powder metallurgy processing can be used for making

dispersion strengthened copper rod.

self lubricating bearing and cemented carbide.

should have low refractoriness.

is made up of large size of crystals.

Dry saturated steam can be converted into superheated steam by

forcing it downwards through a vertical tube.

increasing its cross-sectional area of flow.

passing it through a pressure reducing valve.

forcing it downwards through a vertical tube.

'Flare tower' used in industry is meant for

absorbing the pollutant gases from the furnace exhaust.

venting off (after burning) the excess inflammable/toxic gases at high pressure.

absorbing the pollutant gases from the furnace exhaust.

cooling of furnace exhaust gases.

2253 + Mcqs in Chemical Engineering Basics Page 39 McqOptions

1901.	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

1902.	Ammonia leakage in the refrigeration system is detected by
A.	sulphur stick, which on detection gives white smoke.
B.	using chemical reagents.
C.	its smell.
D.	soap solution.
Answer» B. using chemical reagents.

1903.	Carbon supply in pack carburising process is in the form of
A.	charcoal
B.	calcium carbide
C.	hydrocarbon oil
D.	graphite
Answer» B. calcium carbide

1904.	__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
A.	Beryllia
B.	Zirconia
C.	Alumina
D.	Magnesia
Answer» D. Magnesia

1905.	By X-ray diffraction, it is not possible to determine the
A.	preferred orientation.
B.	residual localised stresses.
C.	particle size.
D.	ordered arrangement of magnetic moments.
Answer» C. particle size.

1906.	In continuous casting process, graphite moulds are used with a view to providing
A.	heat resisting medium.
B.	self lubricating qualities.
C.	non-wetting surfaces.
D.	chilling effect.
Answer» C. non-wetting surfaces.

1907.	For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
A.	increases.
B.	decreases.
C.	remains constant.
D.	increases to a maximum before decreasing.
Answer» B. decreases.

1908.	Floating control action
A.	moves the final control element at constant speed in either direction in response to an error signal.
B.	changes the position of the final control element from on to off.
C.	is used to counteract rapid load changes.
D.	none of these.
Answer» B. changes the position of the final control element from on to off.

1909.	Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.
A.	atoms
B.	neutrons
C.	nucleons
D.	electrons
Answer» B. neutrons

1910.	The refractory lining of the bottom in a basic electric arc furnace is made of
A.	silica
B.	alumina
C.	magnesia
D.	fireclay
Answer» D. fireclay

1911.	__________ metal is used as a bearing liner material.
A.	Pewter
B.	White
C.	Babbit
D.	Gun
Answer» D. Gun

1912.	Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
A.	invar
B.	hastealloy
C.	duralumin
D.	monel metal
Answer» B. hastealloy

1913.	Nitriding of steel is a process for
A.	case hardening
B.	spheroidising
C.	normalising
D.	annealing
Answer» B. spheroidising

1914.	Lubrication is done to control
A.	friction
B.	wear
C.	temperature
D.	all (a), (b) & (c)
Answer» E.

1915.	The co-ordination number in simple cubic structure is
A.	4
B.	6
C.	8
D.	12
Answer» C. 8

1916.	Young's modulus of a material is the measure of its
A.	stiffness
B.	malleability
C.	creep resistance
D.	tensile strength
Answer» B. malleability

1917.	On-off control
A.	fully opens the final control element, when the measured variable is below the set point.
B.	fully closes the final control element, when the measured variable is above the set point.
C.	is a two position control (fully open or fully closed) control adequate to control a process with slow reaction and minimum dead time or transfer lag.
D.	none of these.
Answer» D. none of these.

1918.	If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity
A.	is trebled.
B.	remains unchanged.
C.	decreases by a factor of 3.
D.	decreases by a factor of 1/3.
Answer» C. decreases by a factor of 3.

1919.	First empirical temperature scale conceived is the __________ temperature scale.
A.	Absolute
B.	Reaumer
C.	Farenhite
D.	Celcius
Answer» D. Celcius

1920.	The Al2 O3 content of cryolite in Hall-Heroult's cell is maintained between __________ percent.
A.	43587
B.	18-20
C.	42339
D.	43805
Answer» B. 18-20

1921.	Hot extrusion of aluminium is done in the temperature range of __________ ¬∞C.$
A.	550-600
B.	450-500
C.	350-400
D.	250-300
Answer» D. 250-300

1922.	Multistage compression is necessary for high efficiency,
A.	if the ratio of the delivery pressure to the intake pressure exceeds 5:1.
B.	when large amount of gas is to be compressed.
C.	when the delivered gas is desired at very high velocity.
D.	none of these
Answer» B. when large amount of gas is to be compressed.

1923.	During brazing, if the fluxes are entrapped, it results in the
A.	distortion of brazed joints.
B.	cracking of joints.
C.	presence of gas pockets.
D.	corrosion.
Answer» E.

1924.	Corrosion of metals can not be prevented by its
A.	tempering
B.	chromising
C.	aluminising
D.	alloying
Answer» B. chromising

1925.	__________ iron is produced by the annealing of white cast iron.
A.	Malleable
B.	Nodular
C.	Ductile
D.	Grey
Answer» B. Nodular

Explore topic-wise MCQs in Chemical Engineering.

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.$

Ammonia leakage in the refrigeration system is detected by

Carbon supply in pack carburising process is in the form of

__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.

By X-ray diffraction, it is not possible to determine the

In continuous casting process, graphite moulds are used with a view to providing

For a spontaneous natural process at constant temperature and pressure, the free energy of the system always

Floating control action

Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.

The refractory lining of the bottom in a basic electric arc furnace is made of

__________ metal is used as a bearing liner material.

Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.

Nitriding of steel is a process for

Lubrication is done to control

The co-ordination number in simple cubic structure is

Young's modulus of a material is the measure of its

On-off control

If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity

First empirical temperature scale conceived is the __________ temperature scale.

The Al2 O3 content of cryolite in Hall-Heroult's cell is maintained between __________ percent.

Hot extrusion of aluminium is done in the temperature range of __________ ¬∞C.$

Multistage compression is necessary for high efficiency,

During brazing, if the fluxes are entrapped, it results in the

Corrosion of metals can not be prevented by its

__________ iron is produced by the annealing of white cast iron.

Titanium alloys are welded using the Following process:

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.

__________ is a non volatile film forming constituent of a paint.

Killed steels

Which of the following forces does not act on a fluid at rest ?

The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.

Function of blow down valve in a boiler is to

Rate of chemical reaction is not much affected, if the reactants are in __________ form.

During solid state sintering of powders, the following mechanism can be active.

Powder metallurgy processing can be used for making

Fibrous fracture is normally encountered in the __________ materials.

Hot working of lead is carried out at

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

The most important consideration in value engineering is the

A good abrasive

The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.

Dry saturated steam can be converted into superheated steam by

The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm.

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

'Flare tower' used in industry is meant for

Which of the following is not a cupro-nick-el alloy ?

Cold chiesel's hammers are made of

Existence of velocity potential implies that the fluid is

No cutting fluid is normally used, while machining

1926.	Titanium alloys are welded using the Following process:
A.	TIG welding.
B.	Submerged arc welding.
C.	Butt welding.
D.	Electron beam welding.
Answer» B. Submerged arc welding.

1927.	In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that
A.	compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller.
B.	maintaining vacuum on tube side is more difficult than that on the shell side.
C.	water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.
D.	condenser can act as a storage unit for condensed steam.
Answer» D. condenser can act as a storage unit for condensed steam.

1928.	The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.
A.	equal to
B.	greater than
C.	less than
D.	either (a), (b) or (c); depends on the size of atom
Answer» D. either (a), (b) or (c); depends on the size of atom

1929.	__________ is a non volatile film forming constituent of a paint.
A.	Thinner
B.	Dryer
C.	Drying oil
D.	none of these
Answer» D. none of these

1930.	Killed steels
A.	are free from oxygen.
B.	contain not even traces of sulphur & phosphorous.
C.	are produced by L.D. process only.
D.	contain minimum impurity level.
Answer» B. contain not even traces of sulphur & phosphorous.

1931.	Which of the following forces does not act on a fluid at rest ?
A.	Viscous force
B.	Gravity force
C.	Hydrostatic force
D.	Surface tension force
Answer» B. Gravity force

1932.	The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.
A.	0.5
B.	3
C.	10
D.	25
Answer» C. 10

1933.	Function of blow down valve in a boiler is to
A.	maintain the drum level.
B.	keep the drum pressure constant.
C.	drain out the sludge from the drum.
D.	empty the boiler during shutdown.
Answer» D. empty the boiler during shutdown.

1934.	Rate of chemical reaction is not much affected, if the reactants are in __________ form.
A.	solids
B.	liquids
C.	either (a) or (b)
D.	gaseous
Answer» D. gaseous

1935.	During solid state sintering of powders, the following mechanism can be active.
A.	Evaporation and condensation.
B.	Solid state diffusion processes.
C.	Liquid formation in grain boundaries.
D.	Creation of more dislocations.
Answer» C. Liquid formation in grain boundaries.