Assistant Professor Chemical Engineering 542/2014 Answer Key

Post : Assistant Professor Chemical Engineering
Department : Technical Education
Category Code : 542/14
Question Paper Code : 71/2017/OL
Date of Test : 21-08-2017

Coating of fluorescent lamps
- Reduces glare
- Converts UV rays to visible light
- Converts visible light to UV rays
- Converts visible light to IR rays
If the supply frequency of a 4 pole induction motor is 50 Hz and that of rotor induced emf is 1.5 Hz, at what speed the motor is running?
- 1500 rpm
- 1490 rpm
- 1455 rpm
- 1425 rpm
Calculate the average value of a sinusoidal voltage with a maximum value of 100 V.
- 63.66 V
- 70.71 V
- 31.84 V
- 141.4 V
A coil consists of 700 turns and a current of 10 A on the coil gives rise to a flux of 1.2 mWb. Find the voltage induced in the coil if the current is reversed in 0.02 second.
- 0.9 mV
- 1.43 mV
- 1.96 mV
- 1.68 mV
The open circuit test on transformer will provide the value of
- Core loss
- Full load Cu loss
- Cu loss at half load
- Total full load loss
As per IS classification, the minimum compressive strength of a first class brick should be
- 75 Kg/cm²
- 100 Kg/cm²
- 125 Kg/cm²
- 150 Kg/cm²
The workability of concrete is assessed through
1. Slump test
2. Compaction factor test
3. Setting time of cement
4. Le-Chatelier's apparatus
- 1 and 2
- 2 and 3
- 3 and 4
- 4 and 1
A 30 m metric chain is found to be 10 cm too short throughout a measurement. If the distance measured is recorded as 300 m, what is the actual distance?
- 300.1 m
- 301.0 m
- 299.0 m
- 310.0 m
Consider the following statements :
1. Ranging
2. Levelling
3. Contouring
Which of these statements is/are correct?
- 1 only
- 1 and 2
- 2 and 3
- 1, 2 and 3
Question error
Soundness test of cement is carries out to determine its
- Alumina content
- Iron oxide content
- Free lime content
- Durability under sea water
How many molecules of nitrogen will be present in 28g of nitrogen at standard temperature and pressure?
- 1 molecule
- 2 molecule
- 6.023×10²³ molecule
- 12.046×10²³ molecule
Which of the following ratios defines the recycle ratio in a chemical process?
- recycle stream/fresh feed stream
- gross feed stream/recycle feed stream
- recycle stream/gross feed stream
- None of these
The molar composition of a gas is 10% H₂ , 10% O₂, 30% CO₂ and balance H₂O. If 50% H₂O condenses, the final mole% of H₂ in the gas on a dry basis will be
- 10%
- 5%
- 18.18%
- 20%
The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol X_m satisfies
- X_m < 0.5
- X__m= 0.5
- 0.5 < X_m < 0.64
- X_m >=` 0.64
The necessary and sufficient condition for equilibrium between two phase is
- concentration of each component should be same in the two phase
- the temperature of each phase should be same
- the pressure should be same in the two phases
- the chemical of each component should be same in the two phases
Question error
Van Laar equation deals with the activity coefficients in
- binary solutions
- ternary solutions
- azeotropic mixture only
- none of these
Entropy is a measure of the __________ of a system.
- temperature changes only
- disorder
- orderly behaviour
- none of these
Which of the following is a characteristic of an adiabatic process?
- ΔU = 0
- W = 0
- Q = 0
- ΔV = 0
The number of degrees of freedom for a mixture of ice and water are
- 2
- 1
- 3
- 0
The equation dU = TdS - PdV is applicable to infinitesimal changes occurring in
- an open system of constant composition
- a closed system of constant composition
- an open system with changes in composition
- a closed system with changes in composition
In case of a pressure driven laminar flow of a Newtonian fluid of viscosity (μ) through a horizontal circular pipe, the velocity of the fluid is proportional to
- μ
- μ^0.5
- μ^-1
- μ^-0.5
Losses for flow through valves and fittings are expressed in terms of
- drag coefficient
- equivalent length of a straight pipe
- shape factor
- roughness factor
The local velocity of a fluid along a streamline can be measured by
- Pitot tube
- Venturi meter
- Rota meter
- Orifice meter
Water is flowing under laminar condition in a pipe of length L if the diameter of the pipe is doubled, for a constant volumetric flow rate, the pressure drop across the pipe
- decreases 2 times
- decreases 16 times
- increases 2 times
- increases 16 times
Bernoulli's equation cannot be applied when the flow is
- rotational
- turbulent
- unsteady
- all of these
In pipe flow, heat is transferred from hot wall to the liquid by
- conduction only
- forced convection only
- forced convection and conduction
- free and forced convection
LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is
- higher
- lower
- same
- depends on the area of heat exchanger
Which mechanism of heat transfer is involved in heating a pot with water on a stove?
- Convection
- Conduction
- Radiation
- Induction
Question error
The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by
- painting the surface black
- roughening the surface
- surface a mirror finish
- none of these
Water enters a thin walled tube (L=1m, D=3mm) at an inlet temperature of 97°C and mass flow rate 0.015 kg/s. The tube wall is maintained at a constant temperature of 27°C. Given the following data for water Density ρ = 1000 kg/m³, Viscosity μ = 489×10^-6 Ns/m², Specific heat Cp = 4184J/kg/K Inside heat transfer coefficient h = 12978 W/(m²K) The outlet temperature of water in °C is
- 28
- 37
- 62
- 96
Prandtl number is the ratio of
- mass diffusivity to thermal diffusivity
- Momentum diffusivity to thermal diffusivity
- Thermal diffusivity to mass diffusivity
- thermal diffusivity to momentum diffusivity
Which one of the following statements is true with regards to the percentage saturation (P.S) and relative saturation (R.S)?
- P.S = R.S
- P.S > R.S
- P.S < R.S
- P.S and R.S are not inter related
The feed to a binary distillation column has 40 mole% vapour and 60 mole% liquid. Then the slope of the q-line in the McCabe-Thiele plot is
- -1.5
- -0.6
- 0.6
- 1.5
1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is
- 100 kg
- 200 kg
- 500 kg
- 400 kg
When a multistage try tower uses a minimum reflux ratio it implies?
- infinite trays and maximum reboiler heat load
- minimum trays and minimum reboiler heat load
- infinite trays and minimum reboiler heat load
- minimum trays and maximum reboiler heat load
The absorption factor is defined as
- mG/L
- mL/G
- L/mG
- LG/m
Mass transfer coefficient, k according to penetration theory various with mass diffusivity as
- D^0.5
- D
- 1/D
- D^1.5
Size reduction of coarse hard solids using a crusher is accomplished by
- Attrition
- Compression
- Cutting
- Impact
Sticky materials are transported by
- Apron conveyor
- Screw conveyor
- Belt conveyor
- Hydraulic conveyor
A filtration is conducted at constant pressure to recover solids from dilute slurry. To reduce the time of filtration, the solids concentration in the feed slurry is increased by evaporating half the solvent. If the resistance of the filter medium is negligible, the filtration time will be reduced by a factor of
- 1
- 2
- 4
- 8
The gas phase reaction 2 A -> B is carries out in an isothermal plug flow reactor. The feed consists of 80 mole% A and 20 mole% inert. If the conversion of A at the reactor exit is 50% then C_A/C_Ao at the outlet of the reactor is
- 2/3
- 5/8
- 1/3
- 3/8
The reaction 2A + B -> 2C occurs on a catalyst surface. The reactants A and B diffuse to the catalyst surface and get converted completely to the product C, which diffuses back. The steady state molar fluxes of A, B and C are related by
- N_A = 2N_B = N_C
- N_A = -1/2N_B = -N_C
- N_A = 2N_B = -N_C
- N_A = -1/2N_B = N_C
Overall order of reaction for which rate constant has units of (mol/L)^-3/2 sec^-1 is
- -3/2
- 1/2
- 3/2
- 5/2
The rate constant of a reaction depends upon
- time
- temperature
- weight
- mass
Fora first order isothermal catalytic reaction A -> P, occurring in an infinitely long cylindrical pore, the relationship between effectiveness factor, ε, and Thiele modulus, φ, is
- ε = 1/φ ²
- ε = φ
- ε = 1
- ε = 1/φ
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the
- catalyst size is reduced or the catalyst diffusivity is reduced
- catalyst size is reduced or the catalyst diffusivity is increased
- catalyst size is increased or the catalyst diffusivity is reduced
- catalyst size is increased or the catalyst diffusivity is increased
Static characteristics of an instrument is
- response
- drift
- dynamic error
- time lag
U-tube type manometer is
- half order system
- second order system
- zero order system
- first order system
Bimetallic thermometers are used to measure the temperature in the range of
- -20° to 1600°C
- 300° to 1100°C
- 800° to 2000°C
- -20° to 300°C
Gas chromatography is used for measurement of
- temperature
- pressure
- concentration
- flow rate
Styrene - Butadiene rubber is commercially manufactured by
- bulk polymerization
- suspension polymerization
- solution polymerization
- emulsion polymerization
Triple superphosphate is manufactured by reacting
- Phosphate rock with phosphoric acid
- Phosphate rock with sulphuric acid
- Phosphate rock with nitric acid
- Ammonium phosphate with phosphoric acid
In petroleum refining, the process used for conversion of hydrocarbons to aromatics is
- catalytic cracking
- catalytic reforming
- hydro treating
- alkylation
One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to
- adjust the pH of the syrup
- remove the coloring matter from the syrup
- reduce the viscosity of the syrup
- improve the rate of crystallization of sugar
Which of the following fine dust removal equipment is the most efficient?
- bag filter
- scrubber
- electrostatic precipitator
- cyclone separator
The biological decomposition of organic substances in waste controlled conditions is called
- incineration
- biological oxidation
- composting
- none of these
The resistance of water to the passage of light through it is measure of the
- turbidity
- colour
- hardness
- dissolved gases
In a shell and tube heat exchanger, the 'tube pitch' is defined as the
- O.D. of the tube for square pitch
- shortest distance between two adjacent tube holes
- shortest centre to centre distance between adjacent tubes
- none of these
Spherical shaped pressure vessel is considered to be the most ideal, because
- withstand higher pressure
- fabrication very easy
- designed without wind load considerations
- supported very easily
Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than
- 5 mm
- 10 mm
- 20 mm
- 30 mm
For the same compression ratio and heat input which cycle has maximum thermal efficiency?
- Diesel cycle
- Otto cycle
- Dual cycle
- None of these
A circular disc rolls on the inside surface of a base circle. The radius of the circular disc is equal to half the radius of the base circle. The locus of a point on the circumference of the disc is
- Straight line
- Epicycloid
- Hypocycloid
- Involute
When a belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the
- Tension on the tight side of the belt
- Tension on the slack side of the belt
- Some of tension in the tight side and slack side
- Average tension of the tight side and slack side of the belt
The tenacity or hardness with which the bond holds the cutting point or abrasives in place of a grinding wheel is defined by the term?
- Structure
- Grit size
- Grain size
- Grade
Two geometrically similar pump are run at the same speed. One pump lifts water at the rate of 20 litres per second against a head of 15 meters. The head of the other pump in metres to deliver half the discharge is
- 4.73
- 0.5
- 9.45
- 2.38
The phase difference between the input voltage and output voltage in a common base configuration is ___________
- 0°
- 90°
- 180°
- 270°
An ac supply of 200 V is applied to a half-wave rectifier circuit through a 10 : 1 turns ratio transformer, the Peak Inverse voltage of the diode is _________, assume the diode to be an ideal.
- 14.14 V
- 20 V
- 28.28 V
- 56.56 V
The slew rate of an Op-amp is 2V/μ s. The closed loop voltage gain when the input signal various by 0.5 V in 10μ s is __________
- 2
- 10
- 20
- 40
At 100% modulation in AM, the power in each side band is __________ of that of carrier.
- 50%
- 25%
- 33.3%
- 66.6%
The resistance of an ideal voltmeter is _________
- Zero
- Low
- High
- Infinite
The product of the characteristic roots of a square matrix A is
- 0
- 1
- |A|
- |A-I|
The complete solution of (D²+ a²) y = sin ax is
- Ae^ax + Be^-ax
- A cos ax + B sin ax
- A cos ax + B sin ax + sinax/(2a^2⁾
- none of these
The value of m if F = e^mx ((2y + 3z) i + 2j + 3k) is irrotational is
- 0
- 1
- -1
- 2
The image of the straight line y = k under the mapping w = sinz is
- straight line
- parabola
- ellipse
- hyperbola
The Laplace transform of e^at sinhat is
- a/(s² - 2as + 2a²)
- a/(s² - 2as)
- s/(s² + 2as + 2a²)
- s/(s² + 2as)
The 8-bit encoding format used to store data in a computer is
- ASCII
- EBCDIC
- ANCI
- USCII
SIMD represents an organization that
- refers to a computer system capable of processing several programs at the same time
- represents oprganization of single computer containing a control unit, processor unit and a memory unit
- includes many processing units under the supervision of a common control unit
- none of these
#include<stdio.h>
main()
{
      int x = 0;
      for (; ;)
{
     if (x++ == 4) break;
     continue;
    }
printf("x=%d\n", x);
      }
What will be printed when the above code is executed?
- x = 0
- x = 1
- x = 4
- x = 5
How can one convert numbers to strings?
- Using atoi()
- Using printf()
- Using sprint()
- Using nsprintf()
What will be the data type returned for the following function?
int func()
{
return(double)(char)5.0;
}
- char
- int
- double
- multiple type-casting in return is illegal
The first Attornigeneral of India
- M.C. Sedalvad
- C.K. Daftari
- V. Narahari Rao
- Gulsarilal Nanda
In which newspaper "Veenapoov" of Kumaranasan firstly published?
- Mathrubhoomi
- Kerala Kaumudi
- Mithavadi
- Vivekodayam
Who write the Mahakavya named 'Vishaka Vijayam'?
- A.R. Raja Raja Varma
- Ulloor
- Kerala Varma Valiya Koyithamburan
- Vallathol
Which Part of Indian Constitution deals about State Administration?
- 5th Part
- 7th Part
- 6th Part
- 8th Part
Which book is also known as 'Keralaramam'?
- Nijananda Vilasam
- Hortus Malabaricus
- Samshepa Vedartham
- Vasantholsavam
The year of 'Temple entry proclamation.'
- 1936 Dec. - 12
- 1936 Nov. - 12
- 1936 Sept. - 12
- 1936 Oct. - 12
'Mundhiri Kinar' is related to which social reformer?
- Ananda Thirthan
- Ayyankali
- Agamananda Swami
- Vaikunda Swamikal
Chattambi Swamikal born in
- Patyam
- Venganoor
- Kannamoola
- Chavara
The first Butterfly Safari Park in Asia.
- Thenmala
- Mathikettan Chola
- Shalimar
- Kaziranga National Park
Right to Education Act passed by Indian Parliament.
- August - 2009
- August - 2008
- September - 2009
- August - 2010
The first RTI Application submitted by
- M. Vijaya Kumar
- Theresa Bhattacharya
- Shahid Raza Burney
- P.A. Abraham
The drama 'Punarjanmam' written by
- Thakazhi Sivasankara Pilla
- P. Kesava Dev
- Lalithambika Anthrjanam
- S.K. Pottakkad
Who said "I am the leader, shoot me first before you kill others"?
- Sarojini Naidu
- A.V. Kuttimalu Amma
- Annie Besent
- Akkammacheriyan
The Autobiography of A.K Gopalan
- Jeevitha Katha
- In the cause of the people
- Marakkatha Ormakal
- Ente Jeevithanubhavangal
Question error
The statue of Akkammacheriyan erected at
- Venganoor
- Thrissur
- Thycaud
- Vellayambalam
Which novel of Kesava Dev based the tragedy of partition of India?
- Ayalkar
- Bhranthalayam
- Adhikaram
- Munnottu
The National Food Security Act was signed into law on
- 12th Sept. - 2013
- 12th Nov. - 2013
- 22nd Sept. - 2013
- 22nd Nov. - 2013
Which Article of Indian Constitution deals with the prevention of untouchability?
- Article - 16
- Article - 14
- Article - 21
- Article - 17
Among the following which is the book of Herman Gundert?
- Puthan Pana
- Mishiha Charitham
- Sathyaveda ltihasam
- Janova Parvam
The Araya Samajam was founded by
- Sahodaran Ayyappan
- Pandit Karuppan
- Ayyankali
- Ayya Vaikunda Swamikal

Assistant Professor Chemical Engineering 542/2014 Answer Key

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