Chemical Engineering MCQs [Quiz 43]

Q1. Work done by a/an __________ process is determined by ∫p. dv
(A) Adiabatic
(B) Quasi-static
(C) Isothermal
(D) Isentropic

Q2. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
(A) Grey
(B) Black
(C) Opaque
(D) White

Q3. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.
(A) 1
(B) 10
(C) 30
(D) 50

Q4. Which of the following is the largest quantum of pressure?
(A) 1 kg/cm2
(B) 1 bar
(C) 1 atmosphere
(D) 1 kilo Pascal

Q5. The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is
(A) Magnesite
(B) Chrome
(C) Silica
(D) Fireclay

Q6. Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at
(A) High vacuum
(B) Zero pressure
(C) 0°K
(D) Earth’s centre

Q7. __________ temperature remains constant during adiabatic saturation process of unsaturated air.
(A) Dew point
(B) Dry bulb
(C) Wet bulb
(D) None of these

Q8. In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is
(A) Less
(B) More
(C) Equal
(D) Unpredictable

Q9. Resilience of a bolt can be increased by increasing its
(A) Length
(B) Shank diameter
(C) Head diameter
(D) None of these

Q10. The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the
(A) Fatigue strength
(B) Creep strength
(C) Resilience
(D) Endurance limit

Updated: 3rd September 2019 — 8:26 PM

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