Chemical Heat Transfer MCQs

Option A: 1 and 0

Option B: 0 and 1

Option C: 1 and ∞

Option D: 0 and 0.5

Correct Answer: 1 and 0 ✔

Option A: Abundance & high heat capacity

Option B: Low density

Option C: Low viscosity

Option D: High fluidity

Correct Answer: Abundance & high heat capacity ✔

Option A: Black

Option B: White

Option C: Grey

Option D: Any colour

Correct Answer: Black ✔

Option A: 1 kcal/hr. m2°C

Option B: 4.88 kcal/hr. m.2°C

Option C: 1 kcal/hr. m2.°K

Option D: None of these

Correct Answer: 4.88 kcal/hr. m.2°C ✔

Option A: Basket type

Option B: Horizontal

Option C: Long tube vertical

Option D: None of these

Correct Answer: Basket type ✔

Option A: Increases

Option B: Decreases

Option C: Remains unchanged

Option D: May increase or decrease; depends on its composition

Correct Answer: Decreases ✔

Option A: 1-2 heat exchanger

Option B: 1-1 heat exchanger

Option C: 3-2 heat exchanger

Option D: 2-4 heat exchanger

Correct Answer: 1-1 heat exchanger ✔

Option A: Nucleate

Option B: Local

Option C: Pool

Option D: Saturated

Correct Answer: Local ✔

Option A: Extremely low

Option B: Low

Option C: High

Option D: No

Correct Answer: High ✔

Option A: Approach

Option B: Log mean temperature difference

Option C: Arithmetic mean temperature difference

Option D: Geometric mean temperature difference

Correct Answer: Approach ✔

Option A: CPA > CPB

Option B: CPA < CPB

Option C: kA < 0.5 kB

Option D: kA >2 kB

Correct Answer: kA < 0.5 kB ✔

Option A: U1 = U2

Option B: U2 > U1

Option C: U1 > U2

Option D: U1 = dirt factor – U2

Correct Answer: U1 = U2 ✔

Option A: Co-current

Option B: Counter-current

Option C: Turbulent

Option D: Laminar

Correct Answer: Turbulent ✔

Option A: Co-current

Option B: Cross-current

Option C: Counter-current

Option D: Direct contact

Correct Answer: Direct contact ✔

Option A: Re and Pr

Option B: Re and Gr

Option C: Pr and Gr

Option D: Re and Sc

Correct Answer: Re and Pr ✔

Option A: In low range of temperature differences

Option B: In high range of temperature differences

Option C: Because of its low cost

Option D: To prevent corrosion of the tube bundles

Correct Answer: In high range of temperature differences ✔

Option A: Medium

Option B: Temperature

Option C: Surface

Option D: None of these

Correct Answer: None of these ✔

Option A: Occupies smaller space

Option B: Is more economical

Option C: Is easy to operate and maintain

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: 10

Option B: > 10

Option C: < 10

Option D: Either B. or C., depends on the mass of the body

Correct Answer: 10 ✔

Option A: 1 to 100

Option B: 0.5 to 50

Option C: 10 to 100

Option D: 100 to 1000

Correct Answer: 0.5 to 50 ✔

Option A: Presence of a non-condensable gas decreases the condensing film co-efficient

Option B: Gases under high pressure are routed through the tube side, because high pressure gases are

Option C: Gases to be heated/cooled is normally routed through the shell side, because the corrosion

Option D: All A, B. & C.

Correct Answer: D. All A, B. & C. ✔

Option A: Gives a higher shell side pressure drop

Option B: Gives a lower shell side pressure drop

Option C: Can pack more surface area into a shell of given diameter

Option D: None of these

Correct Answer: Gives a higher shell side pressure drop ✔

Option A: Black

Option B: White

Option C: Coloured

Option D: All A., B. & C.

Correct Answer: Coloured ✔

Option A: Condense the steam flowing in the pipeline

Option B: Remove water resulting from partial condensation of steam

Option C: Stop the supply of steam

Option D: None of these

Correct Answer: Remove water resulting from partial condensation of steam ✔

Option A: Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)

Option B: Outlet temperature of both the hot and cold fluid are same

Option C: Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid

Option D: None of these

Correct Answer: Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid) ✔

Option A: Remove non-condensable gases

Option B: Purge the condenser

Option C: Facilitate easy cleaning of tubes

Option D: None of these

Correct Answer: Remove non-condensable gases ✔

Option A: Lower tube side pressure drop

Option B: Lower shell side pressure drop

Option C: Higher tube side heat transfer co-efficient

Option D: Higher shell side heat transfer co-efficient

Correct Answer: Higher tube side heat transfer co-efficient ✔

Option A: Von-Karman

Option B: Reynolds

Option C: Colburn

Option D: Prandtl

Correct Answer: Prandtl ✔

Option A: Scaling

Option B: Highly viscous

Option C: Corrosive

Option D: Salty

Correct Answer: Highly viscous ✔

Option A: Conduction

Option B: Convection

Option C: Radiation

Option D: Both A. & C.

Correct Answer: Convection ✔

Option A: Decrease

Option B: Increase

Option C: Remain unchanged

Option D: May increase or decrease; depends on the pressure

Correct Answer: Decrease ✔

Option A: 2

Option B: 20.8

Option C: 20.2

Option D: 20.5

Correct Answer: 2 ✔

Option A: High temperature

Option B: High pressure

Option C: Low film co-efficient

Option D: None of these

Correct Answer: Low film co-efficient ✔

Option A: U-tube

Option B: Double pipe

Option C: Fixed tube

Option D: Floating head

Correct Answer: Double pipe ✔

Option A: Forced convection

Option B: Steady state conduction

Option C: Monochromatic radiation

Option D: None of these

Correct Answer: None of these ✔

Option A: 165.4

Option B: 167.5

Option C: 172.5

Option D: 175

Correct Answer: 165.4 ✔

Option A: At a particular temperature

Option B: For circular bodies

Option C: Under thermal equilibrium

Option D: None of these

Correct Answer: Under thermal equilibrium ✔

Option A: Absorber

Option B: Emitter

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Biot

Option B: Nusselt

Option C: Reynolds

Option D: Prandtl

Correct Answer: Reynolds ✔

Option A: Liquid depth over the heating surface

Option B: Solution being evaporated

Option C: Pressure difference between the steam chest and the vapor space above the boiling liquid

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: 0.2

Option B: 0.4

Option C: 0.6

Option D: 0.8

Correct Answer: 0.6 ✔

Option A: Heat transfer co-efficient are high

Option B: There is no risk of contamination

Option C: There is no mist formation

Option D: Cost of equipment is lower

Correct Answer: There is no risk of contamination ✔

Option A: Dowtherm

Option B: Molten sodium

Option C: Water

Option D: Air

Correct Answer: Air ✔

Option A: Long vertical evaporator

Option B: Horizontal tube evaporator

Option C: Agitated film evaporator

Option D: Calandria vertical tube evaporator

Correct Answer: Agitated film evaporator ✔

Option A: Increases

Option B: Decreases

Option C: Remain constant

Option D: May increase or decrease; depends on the material

Correct Answer: May increase or decrease; depends on the material ✔

Option A: Geometric

Option B: Arithmetic

Option C: Logarithmic

Option D: Either A., B. or C.

Correct Answer: Logarithmic ✔

Option A: Re.Gz

Option B: Nu, Pr

Option C: Nu, Pr, Re

Option D: Nu, Gz

Correct Answer: Nu, Gz ✔

Option A: Heat the water from 0°C to 100°C

Option B: Evaporate the water

Option C: To superheat the steam

Option D: Data insufficient, can’t be predicted

Correct Answer: Evaporate the water ✔

Option A: 0

Option B: R2/(R1+R2)

Option C: 1

Option D: (R1/R2)2

Correct Answer: R2/(R1+R2) ✔

Option A: Called the view factor

Option B: Called the angle of vision

Option C: Proportional to the square of the distance between surfaces

Option D: Expressed in terms of radians

Correct Answer: Called the angle of vision ✔

Option A: CO2

Option B: Dissolved O2

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: 0.2 D

Option B: 0.5 D

Option C: 0.66 D

Option D: 0.80 D

Correct Answer: 0.2 D ✔

Option A: Multipass fixed tube sheet

Option B: U-tube

Option C: Single pass fixed tube sheet

Option D: None of these

Correct Answer: U-tube ✔

Option A: Steam economy

Option B: Lower operating costs

Option C: Investment economy

Option D: None of these

Correct Answer: Steam economy ✔

Option A: Absorb or emit

Option B: Refract

Option C: Reflect

Option D: Both B. & C.

Correct Answer: D. Both B. & C. ✔

Option A: Boiler

Option B: Heat exchanger

Option C: Recuperator

Option D: Regenerator

Correct Answer: Heat exchanger ✔

Option A: 0.4

Option B: 0.5

Option C: 0.6

Option D: 0.7

Correct Answer: 0.7 ✔

Option A: 180

Option B: 970

Option C: 3.97

Option D: Data insufficient, can’t be predicted

Correct Answer: 180 ✔

Option A: Kirchoff’s

Option B: Planck’s

Option C: Fourier’s

Option D: None of these

Correct Answer: B. Planck’s ✔

Option A: √(A1 . A2)

Option B: √(A1 + A2)

Option C: ½ √(A1 . A2)

Option D: 2 √(A1 . A2)

Correct Answer: √(A1 . A2) ✔

Option A: 2

Option B: 1/2

Option C: 4

Option D: 1/4

Correct Answer: 4 ✔

Option A: Liquid metal

Option B: Aqueous solution

Option C: Water

Option D: Lube oil

Correct Answer: Liquid metal ✔

Option A: Linear

Option B: Hyperbolic

Option C: Parabolic

Option D: None of these

Correct Answer: Parabolic ✔

Option A: Convection becomes important

Option B: Conduction becomes important

Option C: Radiation becomes important

Option D: Sub-cooled boiling occurs

Correct Answer: Radiation becomes important ✔

Option A: Extractive distillation

Option B: Evaporation

Option C: Leaching

Option D: Absorption

Correct Answer: Evaporation ✔

Option A: Steady state conduction

Option B: Natural convection

Option C: Forced convection

Option D: Radiation

Correct Answer: Radiation ✔

Option A: Scaling characteristics

Option B: High viscosity

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Colburn

Option B: Reynolds

Option C: Prandtl

Option D: None of these

Correct Answer: Reynolds ✔

Option A: Strouhal number

Option B: Sherwood number

Option C: Euler number

Option D: Grashoff number

Correct Answer: Grashoff number ✔

Option A: Is thicker than hydrodynamic boundary layer

Option B: Is thinner than hydrodynamic boundary layer

Option C: And the hydrodynamic boundary layers are identical

Option D: Disappears

Correct Answer: Is thinner than hydrodynamic boundary layer ✔

Option A: On polished surfaces

Option B: On rough surfaces

Option C: In the absence of agitation

Option D: None of these

Correct Answer: On rough surfaces ✔

Option A: 0.5

Option B: < 0.5

Option C: > 0.6

Option D: < 0.1

Correct Answer: > 0.6 ✔

Option A: 1200 W/m2.K

Option B: 894 W/m2.K

Option C: 333 W/m2.K

Option D: 287 W/m2.K

Correct Answer: 333 W/m2.K ✔

Option A: Grashoff

Option B: Nusselt

Option C: Prandtl

Option D: Stanton

Correct Answer: Prandtl ✔

Option A: Increases

Option B: Decreases

Option C: Remain constant

Option D: May increase or decrease, depends on the vacuum

Correct Answer: Increases ✔

Option A: More

Option B: Less

Option C: Same

Option D: More or less; depends on the nature of solution

Correct Answer: More ✔

Option A: Laminar

Option B: Turbulent

Option C: Creeping

Option D: Transition region

Correct Answer: Turbulent ✔

Option A: t

Option B: 1/ρ

Option C: 1/A

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Large temperature differentials

Option B: High heat transfer co-efficient

Option C: Low pressure drop

Option D: Less corrosion of tubes

Correct Answer: Large temperature differentials ✔

Option A: For fluids in laminar flow

Option B: For fluids in turbulent flow

Option C: When Grashoff number is very important

Option D: For liquid metals

Correct Answer: For fluids in turbulent flow ✔

Option A: Increases

Option B: Decreases

Option C: Remain same

Option D: Decreases linearly

Correct Answer: Increases ✔

Option A: Lower heat transfer area

Option B: Lower steam economy

Option C: Higher steam economy

Option D: Higher solute concentration in the product

Correct Answer: Higher steam economy ✔

Option A: Square pitch

Option B: Triangular pitch

Option C: Diagonal square pitch

Option D: None of these

Correct Answer: Triangular pitch ✔

Option A: Kirchoff’s

Option B: Planck’s

Option C: Wien’s displacement

Option D: Stefan-Boltzmann

Correct Answer: Kirchoff’s ✔

Option A: Highest in last effect

Option B: Lowest in last effect

Option C: Same in all effects

Option D: Dependent on the number of effects

Correct Answer: Lowest in last effect ✔

Option A: Nu = 0.023 Re0.8. Pr0.4

Option B: Nu = (π/2) Gz

Option C: Nu = (2/π) Gz

Option D: Nu = 2Gz0.5

Correct Answer: Nu = (2/π) Gz ✔

Option A: Heat flux

Option B: Nusselt number

Option C: Prandtl number

Option D: Schmidt number

Correct Answer: Heat flux ✔

Option A: Increasing temperature of the vapour

Option B: Decreasing temperature of the vapour

Option C: Increasing viscosity of the film of condensate

Option D: Increasing temperature drop

Correct Answer: Increasing temperature of the vapour ✔

Option A: Increases

Option B: Decreases

Option C: Remain same

Option D: First increases upto a certain temperature and then becomes constant

Correct Answer: Decreases ✔

Option A: Once

Option B: Twice

Option C: Thrice

Option D: Four times

Correct Answer: Twice ✔

Option A: Concentration

Option B: Viscosity

Option C: Super-saturation

Option D: Density

Correct Answer: Super-saturation ✔

Option A: Current

Option B: Voltage

Option C: Resistance

Option D: None of these

Correct Answer: Current ✔

Option A: x/KA

Option B: KA/x

Option C: K/Ax

Option D: A/Kx

Correct Answer: KA/x ✔

Option A: Multipass heat exchanger

Option B: Baffled heat exchanger

Option C: Condensation of mixed vapour in a condenser

Option D: All A. B. and C.

Correct Answer: D. All A. B. and C. ✔

Option A: Vacuum

Option B: High pressure

Option C: High residence time

Option D: None of these

Correct Answer: Vacuum ✔

Option A: 1.5

Option B: 1

Option C: > 1

Option D: < 1

Correct Answer: 1 ✔

Option A: Varies directly as the area and the LMTD

Option B: Directly proportional to LMTD and inversely proportional to the area

Option C: Varies as square of the area

Option D: None of these

Correct Answer: Varies directly as the area and the LMTD ✔

Option A: gD3.β.Δtρ2/μ2

Option B: gD2βΔtρ/μ2

Option C: gD2βΔtP2μ

Option D: gD3βΔtP2/μ

Correct Answer: gD3.β.Δtρ2/μ2 ✔

Option A: Parabolic

Option B: Hyperbolic

Option C: Linear

Option D: Logarithmic

Correct Answer: Parabolic ✔

Option A: Tar dolomite bricks followed by asbestos

Option B: Fireclay refractory followed by aluminium sheet

Option C: Cotton followed by aluminium foil

Option D: 85% magnesia cement and glass wool

Correct Answer: 85% magnesia cement and glass wool ✔