Related Questions

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
A Zero
B Small
C Large
D None of the above
Hysteresis loss least depends on
A Volume of material
B Frequency
C Steinmetz’s coefficient of material
D Ambient temperature
Three years ago, a machine was bought for Tk 1,00,000. The installation cost was Tk 20,000. The machine was depreciated in a straight line method at 20% per year. At the end of the 3rd year, the machine was sold for Tk 46,000. What is the gain/loss from sale of this machine?
A gain of Tk 2,000
B gain of Tk 6.000
C loss of Tk 2,000
D loss of Tk 6,000
E None of these
Hysteresis loss and eddy current loss are used in
A Induction heating of steel
B Dielectric heating
C Induction heating of brass
D Resistance heating
A machine P can print out one lakh books in 8 hours. Machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines are started at 9 A.M.While machine P is stopped at 11 A.M. and remaining two machines completed the work. Approximately at what at what time will the work time (to print one lakh books) be finished?
A 11.30 Am
B 12 Noon
C 12.30 Pm
D 11.35 am
A small factory with 3 machines has a job of stamping out a number of pan covers. The newest machine can do the job is 3 days, another machine can do it in 4 days, and the third machine can do it in 6 days. How many days will the factory take to do the job using all the machine?
A 1.333
B 4.333
C 6
D 13
A machine P can paint one lakh books in 8 hours; machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines started operating at 9 A. M. while machine P is stopped at 11 A. M. and the reamaining two machines completed the work. Approximately at what time will the work (to print one lakh books) be finished?
A 11:30 A. M
B 12:00 noon
C 12:30 P. M.
D 1:00 P. M.
In a magnetic material hysteresis loss takes place primarily due to
A Rapid reversals of its magnetization
B Flux density lagging behind magnetizing force
C Molecular friction
D It high retentivity
Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator?
A Providing laminations in armature core
B Providing laminations in stator
C Using nonmagnetic material for frame
D Using material of low hysteresis coefficient for armature core material
A hysteresis motor works on the principle of
A hysteresis loss
B magnetisation of rotor
C eddy current loss
D electromagnetic induction

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