Amortization' in respect of financial obligation of a company means the

commitment of financial obligation on priority.

liquidation of financial obligations on instalment basis.

commitment of financial obligation on priority.

liquidation of all the obsolete equipments of the company.

modernisation of the plant equipments.

The thermodynamic law, PV y = constant, is not followed by the

adiabatic expansion of steam in turbine.

free expansion of an ideal gas.

adiabatic expansion of steam in turbine.

What happens, when SO 2 is passed through a solution of H 2 S in water ?

Precipitation of sulphur takes place.

Two solutions A 1 & A 2 have pH value of 2 & 6 respectively. It implies that the solution

A 1 is more alkaline than solution A 2 .

97 + Mcqs in Chemical Engineering Basics in Chemical Engineering Page 1 McqOptions

1.	In troposphere (the weather domain), the temperature ' t ' at height ' h ' above the sea level in metres is given by (where, temperature at sea level is 15Â°C and t is in Â°C.)
A.	t = 15 - 0.0065 h
B.	t = 15 + 0.0065 h
C.	t = 0.0035 h - 15
D.	t = 15 - 0.0035 h
Answer» B. t = 15 + 0.0065 h

Discussion

2.	A high pressure boiler generates steam at a pressure greater than __________ kg/cm 2 .
A.	10
B.	30
C.	50
D.	80
Answer» E.

Discussion

3.	Which of the following is not an ore of copper?
A.	Cryolite
B.	Azurite
C.	Chalcopyrite
D.	Malachite
Answer» B. Azurite

Discussion

4.	Amortization' in respect of financial obligation of a company means the
A.	liquidation of financial obligations on instalment basis.
B.	commitment of financial obligation on priority.
C.	liquidation of all the obsolete equipments of the company.
D.	modernisation of the plant equipments.
Answer» B. commitment of financial obligation on priority.

Discussion

5.	The cooling rate required to freeze 1 ton of water at 0Â°C into ice at 0Â°C in 24 hours is __________ BTU/hr.
A.	100
B.	200
C.	1000
D.	2000
Answer» C. 1000

Discussion

6.	Ice point' is designated on Farenhite temperature scale by
A.	0Â°
B.	32Â°
C.	62Â°
D.	212Â°
Answer» C. 62Â°

Discussion

7.	Recrystallisation temperature of steel is __________ Â°C.
A.	50
B.	300
C.	500
D.	800
Answer» E.

Discussion

8.	One face of a furnace wall is at 1030Â°C and the other face is exposed to room temperature (30Â°C). If the thermal conductivity of furnace wall is 3 W . m -1 . k -1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is
A.	100
B.	900
C.	9000
D.	10000
Answer» E.

Discussion

9.	Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler. A. Induced draft fan B. Economiser C. Air preheater D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories ?
A.	A, C, B, D
B.	D, B, C, A
C.	D, C, B, A
D.	D, A, B, C
Answer» C. D, C, B, A

Discussion

10.	What is the value of entropy at 273Â°K ?
A.	0
B.	1
C.	?
D.	none of these
Answer» B. 1

Discussion

11.	Heating the hypoeutectoid steels to 30Â°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called
A.	tempering
B.	hardening
C.	annealing
D.	normalising
Answer» D. normalising

Discussion

12.	Plants produce carbohydrates from the CO 2 present in the atmosphere by
A.	polymerisation.
B.	photochemical reaction.
C.	oxidation.
D.	none of these.
Answer» C. oxidation.

Discussion

13.	In case of a, centrifugal pump, the ratio h 1 / h 2 is termed as the __________ efficiency (where, h 1 = actual measured head & h 2 = head imparted to the fluid by impeller).
A.	mechanical
B.	overall
C.	volumetric
D.	impeller
Answer» B. overall

Discussion

14.	Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats ( C p / C v ) ? = specific weight of the gas)
A.	T
B.	1/ p
C.	y
D.	1/ ?
Answer» C. y

Discussion

15.	A solid aluminium ball, when quenched in a water bath maintained at 40Â°C, cools down from 550Â°C to 450Â°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ Â°C.
A.	370
B.	340
C.	320
D.	300
Answer» B. 340

Discussion

16.	For an ideal gas, C p - C v is
A.	R
B.	-R
C.	0
D.	(3/2) R
Answer» B. -R

Discussion

17.	While the oxy-acetylene flame produces a temperature of 3200Â°C, the temperature produced by oxy-hydrogen flame is about __________ Â°C.
A.	1800
B.	2000
C.	2400
D.	3000
Answer» C. 2400

Discussion

18.	__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700Â°C.
A.	Vaneering
B.	Galvanising
C.	Electroplating
D.	Calorising
Answer» E.

Discussion

19.	The value of y = c p / c v . at < 500Â°C for air & most common gases can be safely assumed to be
A.	0.8
B.	1
C.	1.4
D.	1.8
Answer» D. 1.8

Discussion

20.	Tesla metre per ampere ( T . m / A ) is the unit for the measurement of
A.	magnetic succeptibility.
B.	magnetic moment.
C.	permeability of free space.
D.	flux density.
Answer» D. flux density.

Discussion

21.	The thickness of oxide film is y at time t . If K 1 , K 2 and K 3 are the temperature dependent constants, the parabolic law of oxidation is given by
A.	y 2 = 2 k 1 t + k 2
B.	y = k 1 ln ( k 2 t + k 3 )
C.	y = k 1 t + k 2
D.	y = k 1 t 3 + k 2
Answer» B. y = k 1 ln ( k 2 t + k 3 )

Discussion

22.	The thermodynamic law, PV y = constant, is not followed by the
A.	free expansion of an ideal gas.
B.	adiabatic expansion of steam in turbine.
C.	adiabatic compression of air.
D.	ideal compression of air.
Answer» B. adiabatic expansion of steam in turbine.

Discussion

23.	A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.Â°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.
A.	0.01
B.	0.1
C.	0.25
D.	0.5
Answer» C. 0.25

Discussion

24.	The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x 0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)
A.	x 1.5
B.	x 0.8
C.	x -1.5
D.	x -0.8
Answer» C. x -1.5

Discussion

25.	A thin, flat & square plate measuring 2 m x 2 m is freely hanging in ambient air at 25Â°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m 2 . The plate temperature will remain constant at 30Â°C, if the convective heat transfer co-efficient is __________ W/m 2 Â°C.
A.	50
B.	100
C.	150
D.	200
Answer» C. 150

Discussion

26.	Sterilised zone' around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less than 20000 preferably in the upwind direction.
A.	0.5
B.	5
C.	25
D.	50
Answer» C. 25

Discussion

27.	Maximum heat dissipation occurs from a steel wire ( k = 0.5 W/m. k) of 15 mm diameter exposed to air ( h = 20W/m 2 .k), when the insulation thickness is __________ mm.
A.	15
B.	25
C.	10
D.	30
Answer» C. 10

Discussion

28.	Titanium is produced by __________ of Ti Cl 4 .
A.	electrolytic reduction
B.	calcium reduction
C.	magnesium reduction
D.	thermal dissociation
Answer» D. thermal dissociation

Discussion

29.	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/m 2 . Â°K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.Â°K respectively.
A.	2
B.	5
C.	10
D.	20
Answer» B. 5

Discussion

30.	The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm 2 .
A.	273.15
B.	225.65
C.	100.03
D.	373.15
Answer» C. 100.03

Discussion

31.	The tensile strength of plastics ranges from __________ kg/mm 2 .
A.	10 to 50
B.	50 to 100
C.	0.01 to 0.1
D.	0.1 to 10
Answer» E.

Discussion

32.	What is the range of tempering temperature (Â°C) for most of the materials ?
A.	75-100
B.	200-300
C.	350-450
D.	500-600
Answer» C. 350-450

Discussion

33.	What happens, when SO 2 is passed through a solution of H 2 S in water ?
A.	Precipitation of sulphur takes place.
B.	H 2 SO 3 is formed.
C.	Oleum is formed.
D.	None of these.
Answer» B. H 2 SO 3 is formed.

Discussion

34.	The fugacity of liquid water at 298 K is approximately 3171 P a . Considering the ideal heat of vaporisation as 43723 J/gm mole, its fugacity at 300 K would be
A.	3171 P a
B.	3567 P a
C.	1.01 x 10 5 P a
D.	5000 P a
Answer» C. 1.01 x 10 5 P a

Discussion

35.	The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, Â°K)
A.	T
B.	1/ T
C.	T 2
D.	1/ T 2
Answer» B. 1/ T

Discussion

36.	__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500Â°C.
A.	Borosilicate
B.	High silica
C.	Supermax
D.	Lead
Answer» D. Lead

Discussion

37.	High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27Â°C with relative humidity ranging from __________ percent.
A.	5 to 10
B.	15 to 25
C.	45 to 50
D.	75 to 80
Answer» D. 75 to 80

Discussion

38.	The following thermocouple may be used for measuring temperature upto 1873Â°K.
A.	Chromel-alumel
B.	Copper-constantan
C.	Platinum-platinum rhodium
D.	Iron-constatan
Answer» D. Iron-constatan

Discussion

39.	Gage pressure within a spherical droplet of a fluid is ' p '. What will be gage pressure within a bubble of the same size & of the same fluid ?
A.	p
B.	2 p
C.	0.5 p
D.	0.25 p
Answer» C. 0.5 p

Discussion

40.	The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10 -16 m 2 . S -1 and it is 1.94 x 10 -14 m 2 S -1 at 1200 K. The activation energy (in k. J.mole -1 ) for the diffusion of Ni in Cu is
A.	130
B.	180
C.	230
D.	250
Answer» D. 250

Discussion

41.	Two solutions A 1 & A 2 have pH value of 2 & 6 respectively. It implies that the solution
A.	A 1 is more alkaline than solution A 2 .
B.	A 1 is highly acidic.
C.	A 2 is very slightly acidic.
D.	both(b) & (c).
Answer» E.

Discussion

42.	Saturated steam at a pressure of 25 kg/cm 2 is throttled to attain 5 kg/cm 2 . Then the outcoming steam will be
A.	wet
B.	saturated
C.	superheated
D.	none of these
Answer» D. none of these

Discussion

43.	Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs.
A.	enthalpy
B.	relative humidity
C.	wet bulb temperature
D.	dew point temperature
Answer» E.

Discussion

44.	Basicity [%Cao + %MgO/% SiO 2 ) of the slag in Indian blast furnace is in the range of
A.	0.7-1.0
B.	1.1-1.4
C.	1.5 - 1.8
D.	2.0 - 2.5
Answer» C. 1.5 - 1.8

Discussion

45.	Cryogenics' is concerned with the generation & use of low temperature in the range of
A.	0Â°K to 123Â°K
B.	0Â°C to - 123Â°C
C.	0Â°C to - 273Â°C
D.	0Â°K to 273Â°K
Answer» B. 0Â°C to - 123Â°C

Discussion

46.	Between 230 and 370Â°C, blue brittleness is caused in mild steel because of the
A.	immobility of dislocation.
B.	strain-ageing.
C.	increase in Young's modulus.
D.	strain hardening.
Answer» C. increase in Young's modulus.

Discussion

47.	Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m 2 of steel strip.
A.	5-10
B.	1000-1500
C.	120-500
D.	1500-3000
Answer» D. 1500-3000

Discussion

48.	Current employed in resistance welding ranges from __________ kVA/cm 2 .
A.	1.2 to 2.5
B.	4.5 to 6.2
C.	7.5 to 8.5
D.	10.5 to 15.5
Answer» C. 7.5 to 8.5

Discussion

49.	For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm 3 ) while the C.V. is same on weight basis (i.e., kcal/kg) ?
A.	Propane and acetylene
B.	Propane and LPG
C.	Sewage gas and gobar gas
D.	B.F gas and coke oven gas
Answer» E.

Discussion

50.	While the recrystallisation temperature for pure metals is 0.3 T m , the same for alloys is equal to __________ x T m (where, T m Melting temperature).
A.	0.25
B.	0.45
C.	0.70
D.	0.95
Answer» D. 0.95

Discussion

Explore topic-wise MCQs in Chemical Engineering.

In troposphere (the weather domain), the temperature ' t ' at height ' h ' above the sea level in metres is given by (where, temperature at sea level is 15Â°C and t is in Â°C.)

A high pressure boiler generates steam at a pressure greater than __________ kg/cm 2 .

Which of the following is not an ore of copper?

Amortization' in respect of financial obligation of a company means the

The cooling rate required to freeze 1 ton of water at 0Â°C into ice at 0Â°C in 24 hours is __________ BTU/hr.

Ice point' is designated on Farenhite temperature scale by

Recrystallisation temperature of steel is __________ Â°C.

One face of a furnace wall is at 1030Â°C and the other face is exposed to room temperature (30Â°C). If the thermal conductivity of furnace wall is 3 W . m -1 . k -1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is

What is the value of entropy at 273Â°K ?

Heating the hypoeutectoid steels to 30Â°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called

Plants produce carbohydrates from the CO 2 present in the atmosphere by

In case of a, centrifugal pump, the ratio h 1 / h 2 is termed as the __________ efficiency (where, h 1 = actual measured head & h 2 = head imparted to the fluid by impeller).

Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats ( C p / C v ) ? = specific weight of the gas)

A solid aluminium ball, when quenched in a water bath maintained at 40Â°C, cools down from 550Â°C to 450Â°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ Â°C.

For an ideal gas, C p - C v is

While the oxy-acetylene flame produces a temperature of 3200Â°C, the temperature produced by oxy-hydrogen flame is about __________ Â°C.

__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700Â°C.

The value of y = c p / c v . at < 500Â°C for air & most common gases can be safely assumed to be

Tesla metre per ampere ( T . m / A ) is the unit for the measurement of

The thickness of oxide film is y at time t . If K 1 , K 2 and K 3 are the temperature dependent constants, the parabolic law of oxidation is given by

The thermodynamic law, PV y = constant, is not followed by the

A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.Â°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x 0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

Sterilised zone' around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less than 20000 preferably in the upwind direction.

Maximum heat dissipation occurs from a steel wire ( k = 0.5 W/m. k) of 15 mm diameter exposed to air ( h = 20W/m 2 .k), when the insulation thickness is __________ mm.

Titanium is produced by __________ of Ti Cl 4 .

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/m 2 . Â°K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.Â°K respectively.

The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm 2 .

The tensile strength of plastics ranges from __________ kg/mm 2 .

What is the range of tempering temperature (Â°C) for most of the materials ?

What happens, when SO 2 is passed through a solution of H 2 S in water ?

The fugacity of liquid water at 298 K is approximately 3171 P a . Considering the ideal heat of vaporisation as 43723 J/gm mole, its fugacity at 300 K would be

The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, Â°K)

__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500Â°C.

High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27Â°C with relative humidity ranging from __________ percent.

The following thermocouple may be used for measuring temperature upto 1873Â°K.

Gage pressure within a spherical droplet of a fluid is ' p '. What will be gage pressure within a bubble of the same size & of the same fluid ?

The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10 -16 m 2 . S -1 and it is 1.94 x 10 -14 m 2 S -1 at 1200 K. The activation energy (in k. J.mole -1 ) for the diffusion of Ni in Cu is

Two solutions A 1 & A 2 have pH value of 2 & 6 respectively. It implies that the solution

Saturated steam at a pressure of 25 kg/cm 2 is throttled to attain 5 kg/cm 2 . Then the outcoming steam will be

Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs.

Basicity [%Cao + %MgO/% SiO 2 ) of the slag in Indian blast furnace is in the range of

Cryogenics' is concerned with the generation & use of low temperature in the range of

Between 230 and 370Â°C, blue brittleness is caused in mild steel because of the

Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m 2 of steel strip.

Current employed in resistance welding ranges from __________ kVA/cm 2 .

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm 3 ) while the C.V. is same on weight basis (i.e., kcal/kg) ?

While the recrystallisation temperature for pure metals is 0.3 T m , the same for alloys is equal to __________ x T m (where, T m Melting temperature).