ALLInterview.com :: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Google
   
 
Categories >> Engineering >> Electrical Engineering
 
 


 

 
 Civil Engineering interview questions  Civil Engineering Interview Questions (3147)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3304)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13469)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2392)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (423)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (80)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (166)
 Instrumentation interview questions  Instrumentation Interview Questions (2407)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (107)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (45)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (81)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1204)
Question
WAT IS MEANT BY COLD AND HOT START OF A MOTOR?? HOW DOES IT 
AFFECT A MOTOR'S PERFORMANCE??
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Cold start : Starting the motor when it is cold. Means when
motor stoped and starts after long delay, considered as
cold start. Techanically if motor thermal containt is less
than 50%, it is considered cold.

Hot start : When motor is hot and you give start. Means
stoping the motor and immediately restarting is hot
start.Techanically if the motor thermal containt is more
than 50% and a start is given to motor, it is a hot start.

Effect : Any start of motor will result in increase of
thermal containt. If motor is hot (hot start given) than
motor thermal containt further increase hence there will be
detorioration in the insulation and thus life of motor.
 
Is This Answer Correct ?    36 Yes 3 No
Avd
 
Answer
# 2
COLD : motor @ ambient temperature•
HOT : motor @ rated temperature for specific class and service factor.
 
Is This Answer Correct ?    0 Yes 4 No
Mohamed
 
 
 
Answer
# 3
cold start its first start of motor
when the first time u start the motor

hot start of a motor means
second start of motor , after first start of motor u stop
the motor and again u start the motor then motor condition
is hot thats why it is known is hot start

prformance ???
when u start at cold condition , motor takes more starting
current for getting in synchronus condition

and in hot condition motor is already hot thats y it's
starting easy then cold

 
Is This Answer Correct ?    15 Yes 28 No
Mrudang
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
WHY LATCHING CURRENT IS GREATER THATN HOLDING CURRENT?   1
When do you use a VFD motor?   1
What are the disadvantges of leading power factor   5
flurescent bulb rating is to 230v,50HZ.now flurescent connected 230v,25HZ.whether nreduced frequency will affect the glowing properties of flurescent.   6
Why the transmission lines are in 11kV, 22kV, 33kv, and why not 10kV,20kV, 30kV? Bhel 2
why in isolation transformer we dont get any shok?   2
If the supply voltage is same (say 440V) whether a system designed for 60 Hz frequency will work with 50 Hz frequency or not , if so pl. give clarification. ABB 11
Why transformer rating in KVA? and Generator also? IEEE 6
why is power supplied in 3 phase only? why not in 2 or 4 phases?   10
if the back emf eqution for dc motor EB=(QPNZ/60A) THEN what is the value of A for PMDC MOTOR OR how can dicide the value of "A" BSL 2
Regarding units, for voltage we are denoting Volts as V but in case of current we are not denoting Ampere as A instead as I..Why..? Any technical reason for this..?   1
how caculate the pump head to maintain perticuler pressure of water and what would be the motor size in hp for the same?   1
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
   
Copyright © 2013  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  KalAajKal.com