Related Questions

The insulating material used between the commutator segments is normally
A Graphite
B Paper
C Mica
D Insulating varnish
The commutator segments are connected to the armature conductors by means of
A Copper lugs
B Resistance wires
C Insulation pads
D Brazing
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.
What device separates a single network into two segments but lets the two segments appear as one to higher protocols?
A Switch
B Bridge
C Gateway
D Router
To avoid formation of grooves in the commutator of a D.C. machine
A The brushes of opposite polarity should track each other
B The brushes of same polarity should track each other
C Brush position has no effect on the commutator grooving
D All of the above
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
Some wire- wound resistors have bifilar winding. This type of winding is used to
A Increase the thermal stability
B Reduce the tolerance
C Reduce the inductance of winding
D Double the power rating of the resistor
________ cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall
A Direct
B Indirect
C Conventional
D Any of the above

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