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Surging and Choking
What is Surging and Choking?
r.mech
- May 8th, 2010
Due to increse of load on the compressor, mass flow rate is decresed. It would again tend to increase the mass flow rate. This unsteady to and fro motion of the fluid will cause pulsation in the compr...
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Diesel and Petrol Engines
Why diesel engines are called as high torque engines and petrol engines as high speed engines?
Sanjana0320
- Nov 12th, 2009
As diesel engine has high compression ratio therefore it has high torque. Petrol engines have high speeds coz it produces more heat at combustion chamber because of high calorific value moreover heat ...
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Diesel Engine Efficiency
How to control air flow during suction stroke in Diesel engine, as excess Oxygen too reduces the efficiency of engine?
d_tyro_22
- Jan 27th, 2010
In my opinion, extent of opening or closing of the throttle valve is synchronised (during the designing of engine) according to the amount of air intake as per requirement.
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Ethanol Fuel Tank
Why ethanol fuel tank is not used in automobile for increasing efficiency?
rohanmeher0287
- Nov 13th, 2009
Because in automobile we use diesel fuel and diesel fuel and ethanol are non mixing in nature. Gasoline is a octane fuel whereas diesel is a cetane fuel.
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DTS I Type Engines
In DTS I type engines, What will be time delay for 2nd spark produced to the 1st?
ajay s joshilkar
- Dec 27th, 2009
Both the sparks are produced at a time, therefore time between two sparks is zero.
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0 Degree Centigrade
Water freezes at 0 degree centigrade, Ice melts at 0 degree centigrade. How can both be true?
ajay s joshilkar
- Jan 20th, 2010
It is due to latent heat. When heat is supplied to ice at 0 d cg, this latent heat is utilised to convert the phase of ice into water without increasing the temperture and vice versa.
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Absolute Zero
Why is a temperature of absolute zero unachievable?
uthipse
- Jan 26th, 2010
Absolute zero of temperature may be defined as that temperature at which the rms velocities of the gas molecules become zero which is applicable only for ideal gas. Because practically, under extreme low temperature, gases change their stage to liquid much above the abs. temp. and then to solid.
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Isotrphic, Isentrophic, Entrophy and Enthalphy
What is the meaning of isotrphic, isentrophic, entrophy and enthalphy?
kathi88
- Jan 14th, 2010
In general, isotropy means uniformity in all directions.For ex: we say all metals are isotropic in nature.Isentropic process is a constant entropy process.Entropy is the degree of randomness of a subs...
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Bearing Clearances
How can we measure the industrial bearing clearances?
deepakargowda
- Apr 30th, 2010
We can measure bearing clearance with an outside micrometer and a dial bore gauge. We can also use plastiguage to measure the clearance.
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Pawl Ratchet
How do pawl and ratchet works?
vinoythomas
- Mar 15th, 2010
A ratchet mechanism is based on a wheel that has teeth cut out of it and a pawl that follows as the wheel turns
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Labyrinth Sseal
List different types of Labyrinth Seals How to measure Labyrinth Seal Clearrence?What is the allowable clearence?
Lokesh M
- Dec 8th, 2011
Different Types of Labyrinth Seal are as follows: Axial Labyrinth Seal Radial Labyrinth Seal Low Cost Labyrinth Seal Bearing Shield Labyrinth Seal Nilos Ring (AV) Labyrinth Seal Nilos Ring (JV) Labyr...
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Maximum Torque Produced
What is the meaning of maximum torque produced at a specified RPM?
sandeepfunky
- Jul 2nd, 2010
Torque can be defined as the energy used to rotate the body on its own axis. RPM is revolutions per minute. so the maximum torque attained in a particular RPM is the amount of force obtained to rotate a body attached to a fixed point.
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Centrifugel Pump
How does centrifugel pump designer calculate the capacity of pump & discharge head size.
sudeeb
- Dec 20th, 2010
Power for a centrifugal pump = ?flow(M3/hr) x S.G x head(m) x density x g /(1000 x 3600 x 0.745 x pump efficiency )Head developed will depend only on the diameter of the impeller. ?Head and flow is ...
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Length of Capillary Tube
Calculate the length of capillary tube to be used for 165 litre refrigerator?
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Hydraulic Devices
What is an Hydraulic Device?
puneetrawat
- May 15th, 2010
Hydraullic devices are those which has oil as the working medium like hydraullic pumps.
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Gear Shifting Technique
In two wheeler the first gear are engaged in front shifting and remaining are engaged by back shifting of gear pedal, Why?
rakesh8014
- Jul 5th, 2010
It depends on design of gear box. It is not only 1st gear downward and others are upward always, it may be all gears towards down or towards up. The movement of gear lever engage different gears set of gears in different combination to get the required output.
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Vibro Motors
Two electrically operated Vibro Motors are fixed in parallel direction in vibrating feeder. What is the direction of both Vibro Motors?
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Disc Brake
How does disc brake work?
sanjaymanral
- Aug 16th, 2010
It is based on Pascal Law. When we apply brakes fluid inside the pipe maked its way downwards & at that time valve closes. This creates the pressure which is transmitted to the brake shoe & consequently it contracts that hold the tyre at its place.?
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Mechanical Seal
How many types of machanical seals are available? What materials are used to make it?
sudeeb
- Sep 26th, 2010
Mainly mech seals can be classified into single, double. m.o.c is carbon, silicon carbide, PTFE, etc.
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