Answer / bappaditya ghosal

critical speed of a shunt wound generator is that speed for
which the given shunt field resistance will represent
critical field resistance.

Answer / rahul

What will happen if turbine will run long time on critical
speed??

Answer / partha das

when the dynamic frequency of oscillation in coiniside with
the natural frequency of oscillation is called critical
speed.

Answer / vibhu

Can any tell me what is 1st, 2nd & 3rd critical speed of turbo-generator?

Answer / zikireya

Each shaft material has its own natural frequency, when
shaft rotates on such a speed that frequency of shaft
become close to its natural frequency, machine causes noise
& high vibrations because of resonance due to matching of
frequency. This is called Critical speed.

Answer / ravibala

stationary parts frequency and rotary parts frequency
matching point is critical speed

Answer / gaurav

Critical speed is the speed at which rotor's natural
frequency
(rotor speed) matches with its resonent frequency
(exicitation). Running of turbine on this speed would cause
bending or breakage of the shaft.

Answer / dilip mishra

CRITICAL SPEED OF A ROTATING SHAFT IS THE SPEED AT WHICH THE SHAFT STARTS TO VIBRATE VIOLENTLY IN THE TRANSVERSE DIRECTION. IT IS VERY DANGEROUS TO CONTINUE TO RUN THE SHAFT AT ITS CRITICAL SPEED. THE AMPLITUDE OF VIBRATION WILL BUILD UP TO SUCH A LEVEL THAT THE SYSTEM GET BREAK /MAY GO TO PICES.CRITICAL SPEED IS ALSO QUITE OFTEN GIVEN THE NAME WHIRLING SPEED OR WHIPPING SPEED.AT THIS CONDITION THE NATURAL FREQUENCY IS EQUAL TO SYSTEM FREQUENCY.

Answer / haris rajput

The speed of engine is the crankshaft speed which causes the crankshaft to vibrate at its natural frequency of torsional vibration. it is the speed which induces resonance. the consequence of resonance is to cause the crankshaft to vibrate in torsional mode with large amplitudes :)

Answer / acharya

apart from Frequency, speed of rotatng disc also limited
by the fact that tip speed cannot cross sonic speed, larger
discs/propelers, critical speed is determined by tip speed
also.

relation of cop with ikw/tr?

0 Answers  

Deisel engine is designed to generate 10 MW at 50 deg c, can we expect more power from it at 30 deg c.

1 Answers   HIT, TCS,

Explain the difference between an electric motor and an electric generator?

0 Answers  

What are the causes of main engine black smoke?

1 Answers  

what is pulverisation

6 Answers   GNFC,

WHAT SHOUL BE THE RAKE ANGLE WHEN SS IS TO BE MACHINED

3 Answers   Engineers India, Engineers India Limited,

how we convert HP into the KW?

4 Answers  

Hi.. I am studying Mechanical Engineering.. And I am going to prepare for an interwiew of Caritor a software company.. so pleaz tell what i want to study in software and how I should prepare???

2 Answers  

SIR, ME AND MY FRIENDS(MECHANICAL ENGINEERING STUDENTS) PLAN TO GO TO CHENNAI FOR INDUSTRIAL VISIT. MAY I KNOW HOW TO CONTACT THE MAJOR INDUSTRIES, PROCEDURE FOR HAVING A VISIT THERE, AND OTHER DETAILS. COULD YOU PLEASE HELP ME

0 Answers  

what is the significance of pressure angle in spur gear? What is meant by self locking in worm and worm gear?

11 Answers  

CATIA:SPRING WITH SOME RADIUS AXIS

0 Answers   TATA,

Zimbobwe was formerly known as

0 Answers   RRB,