Description : The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is (A) 1.5 (B) 1 (C) √2 (D) None of these
Last Answer : (D) None of these
Description : The opening of a 200 mesh screen (Taylor series) is (A) 0.0074 cm (B) 0.0074 mm (C) 0.0047 cm (D) 74 milli-micron
Last Answer : (A) 0.0074 cm
Description : Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is (A) 0.5 (B) 1 (C) √2 (D) √3
Last Answer : (B) 1
Description : According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress. (A) 0.5 (B) 2 (C) √2 (D) √3/2
Last Answer : (A) 0.5
Description : Rationalise the denominator in each of the following and hence evaluate by taking √2 = 1.414, √3 = 1.732 and √5 = 2.236 up to three places of decimal. -Maths 9th
Last Answer : Rationalisation of denominator
Description : 4×(√3 + √4)2 + 6(√5 +√6)2 -3(√2 + √3)2 =? a) 167 b) 123 c) 157 d) 153 e) 149
Last Answer : ? =4(3+4+2√12) + 6(5+6+2√30)-3(2+3+2√6) =4(7+2√12)+6(11+2√30)-3(5+2√6) =28 + 8√12 + 66 + 12√30 – 15 - 6√6 =(28+66-15) + (8√12+12√30-6√6) =79 + (8√4 × 3 + 12√30 - 6√6) =79+16√3 + 12√30 - 6√6 =79 + 16 ×1.7 + 12 × 5.4 – 6 ×2.4 =79+27.2 + 64.8-14.4 = 156.6 = 157 Answer: c)
Description : The sum of a positive number and its reciprocal is twice the difference of the number and its reciprocal. The number is : (A) √2 (B) 1/√2 (C) √3 (D) 1/√3
Last Answer : Answer: C
Description : Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for (A) British ... (C) American standard screens (ASTM and Tyler standard screens) (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : For a non-spherical particle, the sphericity (A) Is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle (B) Has ... of volume of a sphere having the same surface area as the particle to the actual volume of the particle
Last Answer : (A) Is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle
Description : or Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns. (A) 5 (B) 50 (C) 500 (D) 5000
Last Answer : (C) 500
Description : Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm. (A) 0.007 (B) 0.30 (C) 50 (D) 0.014
Last Answer : (B) 0.30
Description : A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is (A) 0.50 (B) 0.58 (C) 0.68 (D) 0.62
Last Answer : (A) 0.50
Description : 200 mesh screen means 200 openings per (A) cm2 (B) cm (C) inch (D) inch
Last Answer : (C) inch
Description : Pick out the correct statement. (A) Plastic chips are called non-cohesive solids (B) Kick's crushing law is, P/m = K . ln (D̅sa /Ds̅b ) (C) Communition is a generic term for size enlargement ... per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'
Last Answer : (B) Kick's crushing law is, P/m = K . ln (D̅sa /Ds̅b )
Description : Pick out the wrong statement. (A) Hammer crushers operate by impact action (B) Standard screens have circular opening (C) With increase in mesh number of screens, their diameter in microns decreases (D) 200 mesh screen has 200 openings per linear cm
Last Answer : (D) 200 mesh screen has 200 openings per linear cm
Description : Work index is defined as the (A) Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen (B) Energy needed to crush ... of the product passes a 200 mesh screen (D) Energy needed to crush one ton of feed to 100 microns
Last Answer : (A) Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen
Description : Pick out the correct statement. (A) The capacity and the effectiveness of a screen are the same (B) The capacity and the effectiveness of screen are opposing factors (C) The screening surface of a 'reel' (a ... flour mills) is made of silk bolting cloth supported by wire mesh (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C
Description : In the graph shown below, the region in which frequency ratio (ω/ω n ) > √2 is known as____ A. Amplification region B. Isolation region C. Spring controlled region D. None of the above
Last Answer : B. Isolation region
Description : Consider the steady-state absolute amplitude equation shown below, if ω / ω n = √2 then amplitude ratio (X/Y) =? (X/Y) = √{1 + [ 2ξ (ω/ω n )] 2 } / √{[1 – (ω/ω n ) 2 ] 2 + {2ξ (ω/ω n ) 2 } A. 0 B. 1 C. less than 1 D. greater than 1
Last Answer : B. 1
Description : A proton and a deuteron have same kinetic energies while moving in a perpendicular magnetic field. The following gives the ratio of radii of their circular paths a) √2 : 1 b) 1: √2 c) 1:4 d) 1:1
Last Answer : b) 1: √2
Description : When a record is made of an actual measured quality characteristic, such as a dimension expressed with thousands of an inch, the quality is said to be expressed by: 1. traits 2. variables 3. attributes 4. properties
Last Answer : 2. variables
Description : Maths | Complex Numbers | If √3 + i = r (cosθ + i sinθ), then find the value of θ in radian measure.
Last Answer : Solution :
Description : Class 12 | Maths | Complex Numbers | Express the complex numbers modulus-amplitude form - √3 + i
Description : √3-1÷√3+1 rationalise (can solve by finding the rationalizing factor of denominator -Maths 9th
Last Answer : This answer was deleted by our moderators...
Description : Is the speed of the ship related to the number of terms in the Taylor series expansion of a function?
Last Answer : I sat here with an answer and realised I totally misread your question! The direct answer to your question is Yes, but the conditions in which a ship sails is so varied that to try to give a ship a ... though. I can see you were trying to give a certain mpg' rating but it isn't relevant enough.
Description : Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is (A) 10 √2π (B) 5π/2 (C) 5 √2π (D) 5π/√2
Last Answer : (B) 5π/2
Description : A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is (A) 20 m/sec (B) 10 m/sec (C) 5 √2 m/sec (D) 5 m/sec
Last Answer : (B) 10 m/sec
Description : A television channel is characterized by (1) frequency of transmitted signal (2) velocity of transmitted signal (3) physical dimension of television screen (4) size of picture tube
Last Answer : (1) frequency of transmitted signal Explanation: A television channel is a physical or virtual channel over which a television station or television network is distributed. Channel numbers represent actual frequencies used to ... .75 MHz for analog audio (FM), or 55.31 MHz for digital ATSC (8VSB).
Description : In a 14" TV or computer monitor, the dimension of 14" stands for (1) the length of the screen (2) the breadth of the screen (3) the diagonal of the screen (4) the maximum length of the screen
Last Answer : the diagonal of the screen
Description : A television channel is characterised by (1) frequency of transmitted signal (2) velocity of transmitted signal (3) physical dimension of television screen (4) size of picture tube
Last Answer : frequency of transmitted signal
Description : A fluid element has a velocity V = -y 2 . xi + 2yx 2 . j. The motion at (x, y) = (1/√2, 1) is (A) Rotational and incompressible (B) Rotational and compressible (C) Irrotational and compressible (D) Irrotational and incompressible
Last Answer : (B) Rotational and compressible
Description : Air standard Otto cycle is more efficient than the diesel cycle for the same (A) Heat addition & compression ratio (B) Heat addition & pressure (C) Compression ratio & pressure (D) Cylinder dimension & rpm
Last Answer : (A) Heat addition & compression ratio
Description : Consider a triangle A(0, 0), B(1, 1), C(5, 2). The triangle has to be rotated by an angle of 450 about the point P(-1, -1). What shall be the coordinates of the new triangle? (A) A'=(1, √2-1), B'=(-1, 2√2-1), C'=(3√2-1, ... 3√2-1, (9/2)√2-1) (D) A'=(√2-1, -1), B'=(-1, 2√2-1), C'=(3√2-1, (9/2)√2-1)
Last Answer : (C) A'=(-1, √2-1), B'=(-1, 2√2-1), C'=(3√2-1, (9/2)√2-1)
Description : A circle has radius √2 cm. It is divided into two segments by a chord of length 2cm.Prove that the angle subtended by the chord at a point in major segment is 45 degree . -Maths 9th
Last Answer : Given radius =2 cm Therefore AO=2 cm Let OD be the perpendicular from O on AB And AB =2cm Therefore AD=1cm (perpendicular from the centre bisects the chord) Now in triangle AOD, AO=2 cm ... by a chord at the centre is double of the angle made by the chord at any poin on the circumference)
Description : The expression 1/√2 (i + j) is a (A) unit vector (B) null vector (C) vector of magnitude (D) scalar
Last Answer : The expression 1/√2 (i + j) is a (A) unit vector (B) null vector (C) vector of magnitude √2 (D) scalar
Description : Show that vector A = (i - j)/√2 is a unit vector.
Last Answer : Show that \(\vec{A} = \frac{\hat{i} - \hat{j}}{\sqrt{2}}\) is a unit vector. vector A = (i - j)/√2
Description : If the length of a pendulum is doubled, its frequency of oscillation is changed by a factor of (a) 2 (b) √2 (c) 1/2 (d) 1/4
Last Answer : Ans:(c)
Description : An instrument has two strings. Both have the same length and are uniform. One of the strings is under twice as much tension as the other and also twice the mass of the other. Then which of ... d) Both strings vibrate with the same frequency and have the same wave-length and the same wave velocity.
Last Answer : Ans:(d)
Description : A column of length l is fixed at both ends. The equivalent length of the column is (A) l/2 (B) l/√2 (C) l (D) 2 l
Last Answer : (A) l/2
Description : A shaft of length l carries two discs at its two ends. The lowest torsional frequency is ω n . If the shaft length is doubled, then the lowest torsional frequency becomes A ω n /2 B ω n /√2 C √2ω n D 2ω n
Last Answer : B ω n /√2
Description : In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is A. Equal to 1 B. Equal to √2 C. Less than √2 D. Greater than √2
Last Answer : B. Equal to √2
Description : n vibration isolation system, if ω/ω n is less than √2 , then for all values of the damping factor, the transmissibility will be a) less than unity b) equal to unity c) greater than unity d) zero
Last Answer : c) greater than unity
Description : Given that sin A=1/2 and cos B=1/√2 then the value of (A + B) is: (a)30 (b)45 (c)75 (d)60
Last Answer : (c)75
Description : Evaluate: 2+√2 + 1/(2√2) + 1/(√2 - 2) a) 1 + 0.75√2 b) 2 + 1.5√2 c) 2 + √2 d) 2 - √2 e) None of these
Last Answer : 1/(√2 - 2) = (√2 + 2)/(2 - 4) = (√2 + 2)/ -2 1/(2√2) = √2/4 The given equation becomes: 2 + √2 +√2/4 – (√2 + 2) / 2 = (4(2 + √2) + √2 – 2(√2 + 2)) / 4 = (4 + 3√2) / 4 = 1 + 0.75√2 Answer: a)
Description : A proton having mass m and charge q is projected into a region having a perpendicular magnetic field. The angle of deviation of proton when it comes out of the region with mv √2 qB ⁄ is a) π/3 b) π/4 c) π/6 d) 2 π/3
Last Answer : b) π/4
Description : A proton moves in a uniform magnetic field in a circular path of radius R. If the energy of proton is doubled then the new radius becomes a) R √2 b) 2R c) R 2 d) √2 R
Last Answer : d) √2 R
Description : A short column (30 cm 20 cm) carries a load P1 at 4 cm on one side and another load P2at 8 cm on the other side along a principal section parallel to longer dimension. If the extreme intensity on either side is same, the ... to P2 will be (A) 2/3 (B) 3/2 (C) 8/5 (D) 5/8
Last Answer : (C) 8/5
Description : Along column is one whose ratio of effective length to its least lateral dimension exceeds (a) 5 (b) 10 (c) 12 (d) 20
Last Answer : (c) 12