Two generators are running in parallel. One of the generators may run as motor for which of the following reasons ?
That generator takes large share of loads
The field of that generator is weakened
The speed of that generator is increased
The direction of that generator is reversed
That generator takes large share of loads
Flashing the field of D.C. generator means
creating residual magnetism by a D.C. source
making the magnetic losses of forces parallel
neutralising residual magnetism
increasing flux density by adding extra turns of windings on poles
creating residual magnetism by a D.C. source
A D.C. generator works on the principle of
none of the above
Faraday’s law of electromagnetic induction
Lenz’s law
Ohm’s law
Faraday’s law of electromagnetic induction
A series generator can self-excite
only if the load current is not zero
only if the load current is zero
irrespective of the value of load current
none of the above
only if the load current is not zero
D.C. generator generally preferred for charging automobile batteries is
any of’the above
shunt generator
series generator
long shunt compound generator
long shunt compound generator
A shunt generator can self-excite
only if the resistance of the field circuit is greater than critical value
irrespective of the value of the resistance in the field circuit
only if the resistance of the field circuit is less than critical value
none of the above
only if the resistance of the field circuit is less than critical value
The terminal voltage of a series generator is 150 V when the load current is 5 A. If the load current is increased to 10 A the terminal voltage will be
greater than 150 V
none of the above
less than 150 V
150 V
greater than 150 V
A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m. the generated e.m.f. will be nearly
240 V
175 V
150 V
290 V
240 V
The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage
none of the above
may be greater or less than 250 V
will be less than 250 V
will always be 250 V
may be greater or less than 250 V
Two D.C. shunt generators each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V their bus bar voltage will be
267.5 V
270 V
265 V
257.4 V
267.5 V
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