Description : __________ is used for producing a thick suspension from a thin slurry. (A) Cartridge filter (B) Rotary drum vacuum filter (C) Pressure filter thickener (D) Plate and frame filter press
Last Answer : (C) Pressure filter thickener
Description : For separation of sugar solution from settled out mud, we use a __________ filter. (A) Sparkler (B) Plate and frame (C) Centrifugal (D) Rotary drum vacuum
Last Answer : (C) Centrifugal
Description : Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter. (A) Filtering (B) Washing (C) Drying (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : The controlling resistance in a rotary drum vacuum filter is the __________ resistance. (A) Piping (B) Cake (C) Filter medium (D) None of these
Last Answer : (B) Cake
Description : Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc ) is proportional to __________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance). (A) √μ (B) 1/√μ (C) 1/μ (D) 1/μ
Last Answer : (B) 1/√μ
Description : Filtration capacity of a rotary drum vacuum filter depends upon the (A) Cake thickness (B) Characteristics of the feed slurry (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : With increase in drum speed, in a rotary drum filter, the filtration rate (A) Increases (B) Increases linearly (C) Decreases (D) Is not affected
Last Answer : (A) Increases
Description : For classification of potable (drinking) water, we use a __________ filter. (A) Gravity sand (B) Plate and frame (C) Vacuum leaf (D) Rotary vacuum
Last Answer : (A) Gravity sand
Description : For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter. (A) Plate & frame (B) Shell & lea (C) Sand (D) Rotary vacuum
Last Answer : (C) Sand
Description : The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter. (A) Vacuum (B) Sand (C) Plate & frame (D) Rotary
Last Answer : (B) Sand
Description : Percentage of drum submerged in the slurry in case of rotary drum filter is (A) 3 (B) 30 (C) 85 (D) 25
Last Answer : (B) 30
Description : An electric motor drives a windless which hauls up a crate A of weight W = 500 kg up an inclined plane through a height of 10 m in 2 minutes. The torque acting on the windless is 25 kgm and the drum of the ... The efficiency of the inclined plane would be a.0.41 b.0.61 c.0.265 d.0.5305 e.0.66
Last Answer : d. 0.5305
Description : Removal of activated carbon from glycerine is done by (A) Plate and frame filter (B) Rotary vacuum filter (C) Batch basket centrifuge (D) None of these
Last Answer : (A) Plate and frame filter
Description : Which of the following is a vacuum filter? (A) Filter press (B) Rotary disc filter (C) Batch basket centrifuge (D) Tank filter (Nutsche filter)
Last Answer : (B) Rotary disc filter
Description : A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the new discharge will be __________ litres/minute. (A) 500 (B) 200 (C) 1000 (D) 750
Last Answer : (A) 500
Description : Free flowing granular materials can be best dried in a __________ drier. (A) Rotary (B) Cylinder (C) Drum (D) Freeze
Last Answer : (A) Rotary
Description : Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer. (A) Rotary (B) Vacuum (C) Tunnel (D) Tray
Description : Drying of refractory is normally carried out in a __________ dryer. (A) Open pan (B) Tray (C) Rotary vacuum (D) Truck/tunnel
Last Answer : (D) Truck/tunnel
Description : Large quantity of silica gel is normally dried in a __________ dryer. (A) Freeze (B) Through circulation (C) Rotary vacuum (D) Tray
Last Answer : (B) Through circulation
Description : Large scale drying of wheat is done in a __________ dryer. (A) Fluidised bed (B) Spouted bed (C) Tray (D) Vacuum rotary
Last Answer : (B) Spouted bed
Description : A mono pump is a __________ pump. (A) Centrifugal (B) Piston (C) Positive acting rotary (D) A group of vacuum
Last Answer : (C) Positive acting rotary
Description : Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg. (A) 1 (B) 0.1 (C) 0.01 (D) 0.001
Last Answer : (C) 0.01
Description : To handle smaller quantity of fluid at higher discharge pressure, use a __________ pump. (A) Reciprocating (B) Centrifugal (C) Volute (D) Rotary vacuum
Last Answer : (A) Reciprocating
Description : Capacity of a rotary dryer depends on its (A) rpm (B) Inclination with ground surface (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : Moore filter is a __________ filter. (A) Leaf (B) Press (C) Rotary (D) Sand
Last Answer : (A) Leaf
Description : A 3-phase, 400 votts, 50 Hz, 100 KW, 4 pole squirrel cage induction motor with a rated slip of 2% will have a rotor speed of (A) 1500 rpm (B) 1470 rpm (C) 1530 rpm (D) 1570 rpm
Last Answer : Ans: B N = NS (1-S) and NS =120 f / p =120 x 50 /4 = 1500 rpm ∴N= 1500 (1-0.02) =1470 rpm
Description : Sedimentation on commercial scale occurs in (A) Classifiers (B) Thickeners (C) Rotary drum filters (D) Cyclones
Last Answer : (C) Rotary drum filters
Description : A slurry is to be dried to produce flaky solid. Which dryer would you recommend? (A) Spray dryer (B) Drum dryer (C) Rotary dryer (D) Dielectric drye
Last Answer : (A) Spray dryer
Description : Speed of the cutter bar in case of combine (grain) is (a)400-550 rpm (b) 500-800rpm (c)800-1000rpm (d) 1000-1200rpm
Last Answer : a)400-550 rpm
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 : Gelatinous solid (which plug the septum) can be filtered by a __________ filter. (A) Sparkler (B) Plate and frame (C) Vacuum leaf (D) Pre-coat
Last Answer : (D) Pre-coat
Description : Filtration of water in a paper mill is done by a/an __________ filter. (A) Open sand (B) Plate and frame (C) Vacuum leaf (D) Sparkler
Last Answer : (A) Open sand
Description : Which of the following may prove unsuitable for filtering volatile liquids? (A) Pressure filter (B) Gravity filter (C) Centrifugal filter (D) Vacuum filter
Last Answer : (D) Vacuum filter
Description : In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be ... metres above the ground (C) 5 metres above ground (D) 10 metres above ground
Last Answer : (A) At ground level
Description : Trommels are revolving screens which normally operate in the range of __________ rpm. (A) 1 - 2 (B) 15 - 20 (C) 40 - 50 (D) 60 - 75
Last Answer : (B) 15 - 20
Description : Sand is dried in foundries in a _________drier. (A) Rotary (B) Fluidised bed (C) Vacuum (D) Spray
Last Answer : (B) Fluidised bed
Description : Which of the following is a batch sedimentation equipment? (A) Dust catcher (B) Filter thickener (C) Dry cyclone separator (D) Rotary sprayer scrubber
Last Answer : (B) Filter thickener
Description : Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m2°C. (A) 10-50 (B) 100-500 (C) 1000-1500 (D) 5000-15000
Last Answer : (D) 5000-15000
Description : A thin, flat & square plate measuring 2 m 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will ... heat transfer co-efficient is __________ W/m2 °C. (A) 50 (B) 100 (C) 150 (D) 200
Last Answer : (B) 100
Description : A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the power consumed now will be __________ hp. (A) 0.5 (B) 2 (C) 4 (D) 1
Last Answer : (A) 0.5
Description : A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, then the new head will be __________ metres. (A) 2 (B) 4 (C) 8 (D) 5.5
Last Answer : (A) 2
Description : A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to (A) 25 (B) 50 (C) 100 (D) 250
Last Answer : (B) 50
Description : A 3 phase 50 Hz induction motor has full load speed of 970 rpm. Calculate no of poles and slip frequency.
Last Answer : The number of poles in an induction motor can be calculated using the following formula: No. of poles = (120 * frequency) / speed In this case, the number of poles would be calculated as follows: No. of poles = ( ... ) - 50 Hz = 8.08 Hz So the motor has 6 poles and a slip frequency of 8.08 Hz.
Description : Speed of power operated machine chaff cutter is E. 35 rpm F. 50 rpm G. 600-1000 rpm H. None of the above
Last Answer : G. 600-1000 rpm
Description : Speed of band operated machines chaff cutter having two knives F. 35 rpm G. 50 rpm H. 600 rpm I. 1000 rpm
Last Answer : F. 35 rpm
Description : A 50 Hz, 3—phase induction motor has a full load speed of 1440 rpm. The number of poles of the motor is: (A)4 (8)6 (0)12 (D)8
Last Answer : Ans: A N= Ns (1-S) = NS –NS x S 1440 = Ns (1-S) Ns = 1440 / (1-S) Ns = (120 f/ p) = 120 x 50/p = 6000 p Ns will be closer to N i.e 1440 When P=2 ; Ns = 3000 rpm , not close to N When P=4 ; Ns = 1500 rpm , it is closer to N Therefore P =4 for N=1440
Description : Calorific value of dry wood may be around __________ Kcal/kg. (A) 5 (B) 50 (C) 500 (D) 5000
Last Answer : (A) 5
Description : Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec. (A) 0.5 (B) 10 (C) 50 (D) 500
Last Answer : (B) 10
Description : A four pole turbogenerator is used in conjunction with a 160 pole propulsion motor. If the generator is turning at 3,200 RPM, what is the current speed of the propeller? A. 40 RPM B. 60 RPM C. 80 RPM D. 100 RPM
Last Answer : Answer: C
Description : A 4 pole lap wound dc shunt motor rotates at the speed of 1500 rpm, has a flux of 0.4 mWb and the total number of conductors are 1000. What is the value of emf? (A) 100 Volts. (B) 0.1 Volts. (C) 1 Volts. (D) 10 Volts.
Last Answer : Ans: D Given N = 1500 rpm, Φ = 0.4 mWb, Z = 1000, P = 4, & A= 4 Therefore, Eb = NΦPZ / 60 A = 1500 x 0.4 x 4 x 1000 x 10^-3 / 60 x 4 = 60/6 = 10 volts