The interfacial area per unit volume of dispersion, in a gas-liquid
contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5
mm is given by (in m2
/m3
)
(A) 500
(B) 1200
(C) 900
(D) 800
Description : The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2 . The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10 -8 W/m2 .K4 ) (A) 1000 (B) 727 (C) 800 (D) 1200
Last Answer : (A) 1000
Description : Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface? (A) Liquid density (B) Liquid viscosity (C) Hot surface temperature (D) Interfacial tension
Last Answer : (D) Interfacial tension
Description : Mean drift velocity of electron in a copper wire having cross-sectional area 5.0 × 10-6 m2 carrying current of 1 A and having number density 8.5 × 1028 m3 is A. 0.015 mm s-1 B. 0.1 mm s-1 C. 0.5 mm s-1 D. 0.25 mm s-1
Last Answer : 0.015 mm s-1
Description : 200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 10 -3 kg/m2 .s. The initial ... moisture/kg dry solid). (A) 0.5 (B) 0.05 (C) 0.1 (D) 0.15
Last Answer : (C) 0.1
Description : The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area in m2 , V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids in kg/m3 ) (A) 3.6 AVS.ρ (B) 3.6 A.V.ρ (C) 3.6 A.S. ρ (D) 3.6 AVS/ρ
Last Answer : (A) 3.6 AVS.ρ
Description : Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air. (A) 50-80 (B) 250-400 (C) 1000-1200 (D) 800-900
Last Answer : (B) 250-400
Description : The unit of bulk modulus of elasticity for a liquid in S.I. unit is (A) N (B) N/m (C) N/m2 (D) N/m3
Last Answer : (C) N/m2
Description : Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ column. (A) Spray (B) Packed (C) Bubble cap plate (D) Wetted wall
Last Answer : (D) Wetted wall
Description : Molecular volume of any perfect gas at 600 x 103 N/m2 and 27°C will be (a) 4.17m3/kgmol (b) 400 m3/kg mol (c) 0.15 m3/kg mol (d) 41.7 m3/kg mol (e) 417m3/kgmol.
Last Answer : Answer : a
Description : Check supervisor in RMS the standard for test sorting will be a) 500 article per hour b) 800 article per hour c) 1000 article per hour d) 1200 article per hour
Last Answer : a) 500 article per hour
Description : Fractional solvent extraction (A) Employs only one solvent (B) Employs two solvents (C) Results in low interfacial tension (D) None of these
Last Answer : (B) Employs two solvents
Description : __________ columns are used for liquid dispersion in a continuous gas phase. (A) Packed (B) Pulse (C) Bubble cap (D) Sieve plate
Last Answer : (A) Packed
Description : The rate of mass transfer is not dependent upon the (A) Degree of dispersion of one fluid in the other (B) Interfacial surface exposed between the phases (C) Both (A) & (B) (D) None of these
Last Answer : (D) None of these
Description : An ideal tower packing should not (A) Have low weight per unit volume (B) Have large surface area per unit volume (C) Have large free cross-section (D) Hold up large amount of liquid in the packing
Last Answer : (D) Hold up large amount of liquid in the packing
Description : The expected out turn of half brick partition wall per mason per day is (A) 1.5 m3 (B) 2.0 m3 (C) 4.0 m2 (D) 5.0 m2
Last Answer : (B) 2.0 m3
Description : Which of the following equipments is used for liquid dispersion? (A) Packed column (B) Venturi scrubber (C) Bubble cap plate column (D) Wetted wall column
Last Answer : Option B
Description : Unit of mass velocity is (A) kg/hr (B) kg/m2 . hr (C) kg/m2 (D) kg/m3 . hr
Last Answer : (B) kg/m2 . hr
Description : Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2.k), when the insulation thickness is __________ mm. (A) 15 (B) 25 (C) 10 (D) 30
Last Answer : (B) 25
Description : 17. The brain capacity of Neanderthal man is--- (a) 1400 cc (b) 900 cc (c) 650-800 cc (d) 400-500 cc
Last Answer : (a) 1400 cc
Description : The brain of human adult weighs about - (1) 1200 - 1300 gm (2) 1600 - 2000 gm (3) 500 - 800 gm (4) 104 - 200 gm
Last Answer : (1) 1200 - 1300 gm Explanation: The adult human brain weighs on average about 3 lbs. (1.5 kg) with a volume of around 1130 cubic centimetres (cm3) in women and 1260 cm3 in men, although ... same general structure as the brains of other mammals, but is larger than any other in relation to body size.
Description : The brain of human adult weighs about-----? A. 1200 – 1300 gm (Answer) B. 1600 – 2000 gm C. 500 – 800 gm D. 100 – 200 gm
Last Answer : A. 1200 – 1300 gm (Answer)
Description : The cutter bar of a tractor operated on owner makes strokes/min (a) 400 – 500 (b) 500 – 750 (c) 800 – 1200 (d) 1250 – 1500
Last Answer : (c) 800 – 1200
Description : Speed of the cutter bar in case of combine (grain) is :- a) 400 – 550 rpm b) 500 – 800 rpm C) 800 - 1000 rpm d) 1000 – 1200 rpm
Last Answer : a) 400 – 550 rpm
Description : For protection of level crossing gate in an emergency on BG double line the Gateman should place one detonator at one place and 3 detonators at a subsequent place at a distance of ------- a) and------ ... c) 500 meters and 1000 meters d) 600 meters and 1200 meters* e) 800 meters in 1500 meters
Last Answer : d) 600 meters and 1200 meters*
Description : Indication post for detonator should be provided at a distance of ---------meter and --------- meter for BG level crossing a) 400 meters in 800 meters b) 500 meters and 1200 meters c) 600 meters and 1200 meter * d)600 meters and 1000 meters
Last Answer : c) 600 meters and 1200 meter *
Description : The brain of human adult weighs about (1) 1200 – 1300 gm (2) 1600 – 2000 gm (3) 500 – 800 gm (4) 100 – 200 gm
Last Answer : 1200 – 1300 gm
Description : Concentration range (given as weight of gas per unit chamber volume) for ethylene oxide is A 15–100mg/L B 800–1200mg/L C 120–180mg/L D 1000–1200mg/L
Last Answer : B 800–1200mg/L
Description : Electrolytic reduction cell used for conversion of calcined Al2O3to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to (A) Achieve very high ... by the generation of heat (C) Electrolytically dissociate alumina (D) Both (B) & (C)
Last Answer : (D) Both (B) & (C)
Description : Which of the following is the most liquid money? A. M1 B. M2 C. Securities D. M3 E. Call Money
Last Answer : A. M1 Explanation: The most liquid portions of the money supply are measured by M1 because it contains currency and assets that can be converted to cash quickly. ―Near money‖ and ―near, near money,‖ which fall under M2 and M3, cannot be converted to currency as quickly.
Description : . __________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction. (A) Packed (B) Bubble (C) Spray (D) Tray
Last Answer : (B) Bubble
Description : When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ column. (A) Packed (B) Spray (C) Tray (D) Bubble
Last Answer : (D) Bubble
Description : The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of ... A) Liquid side (B) Gas side (C) Interfacial (D) Both liquid and gas side
Last Answer : (B) Gas side
Description : The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in m2. -Maths 9th
Last Answer : The roller is in the form of a cylinder of diameter = 84 cm ⇒ Radius of the roller(r) = 842 cm = 42 cm Length of the roller (h) = 120 cm Curved surface area of the ... roller = 31680 cm2 = 3168010000m2 ∴ Area of the playground levelled in 500 revolutions = 500 x 3168010000m2 = 1584m2
Description : The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in m2? -Maths 9th
Last Answer : A roller is shaped like a cylinder. Let h be the height of the roller and r be the radius. h = Length of roller = 120 cm Radius of the circular end of roller = r = (84/2) cm = 42 cm Now, CSA of roller = 2πrh = ... , we have 2 (22/7) 0.7 h = 4.4 Or h = 1 Therefore, the height of the cylinder is 1 m.
Description : SI unit for the surface tension is ____. (1) kg/m2 (2) kg/m3 (3) N/m (4) kg/m
Last Answer : (3) N/m Explanation: Surface tension is measured in force per unit length. Its SI unit is Newton per meter.
Description : The unit of surface tension is (A) N/m (B) N/m2 (C) N/m3 (D) N-m
Last Answer : Answer: Option A
Description : What is the unit of relative density? (1) kg/m (2) kg/m2 (3) kg/m3 (4) It has no unit
Last Answer : It has no unit
Description : Which of the following same diameter columns gives lowest pressure drop per unit height? (A) Bubble-cap column (B) Sieve-plate column (C) Packed column (stacked)
Last Answer : (C) Packed column (stacked)
Description : To get high tray efficiency (A) Interfacial surface between liquid and gas phase should be large (B) Time of contact between the two phases should be less (C) Gas velocity should be very low (D) Liquid entrainment should be severe
Last Answer : (A) Interfacial surface between liquid and gas phase should be large
Description : The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is (A) 200 kg/m3 (B) 400 kg/m3 (C) 600 kg/m3 (D) 800 kg/m
Last Answer : Answer: Option D
Description : As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m3 .(μg-microgram) (A) 10 (B) 90 (C) 800 (D) 750
Last Answer : (B) 90
Description : For an incompressible fluid, the bulk modulus of elasticity is (A) 5 kg/m3 (B) ∞ N/m2 (C) 1 N (D) 0 N/m
Last Answer : (B) ∞ N/m2
Description : Which of the following equipments is not used for gas dispersion? (A) Agitated vessels (B) Bubble cap tray towers (C) Perforated sieve tray towers (D) Spray towers
Last Answer : (D) Spray towers
Description : Match the items given in column I with those in column II and select the correct option given below. Column I Column II (A) Tidal volume (i) 2500 - 3000 mL (B) Inspiratory reserve (ii) 1100 - 1200 mL volume (C) Expiratory reserve (iii ... i) (iv) (ii) (c) (i) (iv) (ii) (iii) (d) (iv) (iii) (ii) (i)
Last Answer : (b) (iii) (i) (iv) (ii)
Description : Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripheral velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m3 here, V =πND where, N = speed of the rolls ... V.W.Dr.ρ (B) 3.6 V.W. ρ (C) 3.6 W.Dr.ρ (D) 3.6 V.W.Dr/ρ
Last Answer : (A) 3.6 V.W.Dr.ρ
Description : Torque and bending moment of 100 kN.m and 200 kN.m acts on a shaft which has external diameter twice of internal diameter. What is the external diameter of the shaft which is subjected to a maximum shear stress of 90 N/mm2? a. 116.5 mm b. 233.025 mm c. 587.1 mm d. 900 mm
Last Answer : c. 587.1 mm
Description : Which rate is the greatest 800 miles per 16 hours 1500 miles per 50 hours 600 miles per 15 hours or 900 miles per 20 hours?
Last Answer : Convert them all to the same per x hours and then compare them.You can either convert them all to unit rates (x = 1) or some otherrate (eg lcm of 16, 50, 15 and 20).I'll use unit rates:800 miles ... 800 miles per 16 hours > 900 miles per 20 hours > 600miles per 15 hours > 1500 miles per 50 hours.
Description : How many 8-bit characters can be transmitted per second over a 9600 baud serial communication link using asynchronous mode of transmission with one start bit, eight data bits, two stop bits, and one parity bit ? a. 600 b. 800 c. 876 d. 1200
Last Answer : b. 800
Description : An industry employed 1200 men and 800 women and the average salary was Rs 51 per day. If a woman got Rs 10 less than a man , then what are their daily salary?(mens and women respectively) A) men Rs 25 and women Rs ... Rs 45 and women Rs 55 C) men Rs 35 and women Rs 25 D) men Rs 55 and women Rs 45
Last Answer : D) Let the daily salary of man be Rs’x’ Then the daily salary of a women = Rs (x-100 Now 1200x + 800(x-10) = 51 *(1200+800) 1200x+800x -8000 = 51*2000 2000x = 102000+8000 =110000 X=55 Therefore mens daily salary Rs 55 and womens daily salary Rs 45
Description : Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer coefficient based on the liquid side for dilute systems for the above was estimated to be 4 ... -4 (C) 5.6 10 -3 (D) 8.5 10 -3
Last Answer : (B) 8.5 × 10 -4