Chemical Engineering Basics Quiz 11
1 / 50
The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased _____ times ?
2 / 50
The boiling & freezing points on a newly defined temperature scale in degree ?D? are 400?D & 100?D respectively. The temperature reading corresponding to 60?C on this new temperature scale will be equal to ______ ?D ?
3 / 50
The atmospheric temperature during melting of ice/snow (in the atmosphere)__________?
4 / 50
The cathode in an electrochemical cell always carries______?
5 / 50
The following type of bonding is strongly directional in solids ?
6 / 50
The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) ?
7 / 50
The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 ? T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by__________?
8 / 50
The difference between gross & net calorific values of fuel is due to the_____?
9 / 50
The main constituent of bones is ________?
10 / 50
The delivery pressure of boiler feed water pump compared to the boiler steam pressure is_____?
11 / 50
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 ? 10-16 m2S-1 and it is 1.94 ? 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is__________?
12 / 50
The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the ______ of the slag ?
13 / 50
The Al2O3 content of cryolite in Hall-Heroult cell is maintained between ________ percent ?
14 / 50
The majority charge carriers in p-type silicon are________?
15 / 50
The activity of pure hydrogen gas at 1000?C and 5 atm pressure__________?
16 / 50
The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for _______ at room temperature ?
17 / 50
The main charge in blast furnace is usually_____?
18 / 50
The approximate height of a blast furnace having a useful volume of 2000 m3 is about ________ metres ?
19 / 50
The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the_________?
20 / 50
The burnout heat flux in the nucleate boiling regime is not a function of the__________?
21 / 50
The dimensional formula of bulk modulus of elasticity is same as that of the ______?
22 / 50
The condition of diffraction from a crystal is given by_______?
23 / 50
The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of _______ mm ?
24 / 50
The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6) ?
25 / 50
The bank of tubes located at the back of the domestic refrigerators are the ________ tubes?
26 / 50
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ?
27 / 50
The maximum thickness of the metal which can be welded using ultrasonic welding is ______ mm ?
28 / 50
The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the _______ of a boiler ?
29 / 50
The leaching solvent used in Baeyer?s process for the purification of bauxite is_____?
30 / 50
The co-ordination number in simple cubic structure is_____?
31 / 50
The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is_____?
32 / 50
The hardenability of steel decreases with___________?
33 / 50
The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong _______?
34 / 50
The best lubricants for a machine working at high temperature & load is__________?
35 / 50
The effect of friction on the flow of steam through a nozzle is to decrease the ________ of steam?
36 / 50
The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?
37 / 50
The activity co-efficient of the solute in a dilute solution ?
38 / 50
The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their___________?
39 / 50
The elastic strain in copper is due to the___________?
40 / 50
The best guide to judge the general quality of water is the measurement of its___________?
41 / 50
The cooling rate required to freeze 1 ton of water at 0?C into ice at 0?C in 24 hours is _______ BTU/hr?
42 / 50
The following thermocouple may be used for measuring temperature upto 1873?K___________?
43 / 50
The life of a ball bearing is inversely proportional to_________?
44 / 50
The highest stress that a material can withstand for a specified length of time without excessive deformation is called the _____ strength ?
45 / 50
The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the________?
46 / 50
The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be_________?
47 / 50
The lightest non-inflammable gas is__________?
48 / 50
The emf of a Deniell cell ?Zn | Zn2+ || Cu2+ | Cu? can be increased by__________?
49 / 50
The excess air required for the combustion of pulverized coal is of the order of about ________ percent ?
50 / 50
The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the__________?
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