Related Questions

In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will
A Cause withdrawing or throttling of steam
B Reduce length of effective stroke of piston
C Reduce maximum opening of port to steam
D All of these
The insulation between windings and grounded core and the insulation between the windings of the same phase is
A minor insulation
B major insulation
C either of the above
D none of the above
Multilayer helical windings are commonly used in the transformers as high voltage windings
A upto 20 kV
B upto 50 kV
C upto 80 kV
D for 110 kV and above
In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by
A 10%
B 20%
C 30%
D 40%
The weight of copper of both armature and field windings decreases with _____ in number of poles.
A increase
B decrease
C either of the above
D none of the above
If ‘Hs’ is the significant wave height, then the average wave height and highest wave height respectively are given by
A 0.6 Hs and 1.67 Hs
B 0.6 Hs and 1.87 Hs
C 1.27 Hs and 1.87 Hs
D 1.27 Hs and 1.67 Hs
In case of D.C. machine winding, number of commutator segments is equal to
A Number of armature coils
B Number of armature coil sides
C Number of armature conductors
D Number of armature turns
The number of brushes in a commutator depends on
A Speed of armature
B Type of winding
C Voltage
D Amount of current to be collected
_______ brushes are fragile and cause excessive wear of commutator,
A Natural graphite
B Hard carbon
C Electro graphitic
D Metal graphite
The insulating material used between the commutator segments is normally
A Graphite
B Paper
C Mica
D Insulating varnish

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