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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux
remains constant.
decreases
increases.
decreases.
remains constant.
decreases
increases.
decreases.
Answer
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Related Question
Electrical Machines
When the supply terminal of a DC shunt motor are interchanged
The motor will run at its normal speed in the same direction as before.
The motor will run much faster in the same direction.
The motor will stop.
The direction of rotation will reverse.
The motor will run at its normal speed in the same direction as before.
The motor will run much faster in the same direction.
The motor will stop.
The direction of rotation will reverse.
Answer
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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?
40%
68%
38%
60%
40%
68%
38%
60%
Answer
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Electrical Machines
In travelling cranes for swing action which motor is preferred?
DC series motor.
Capacitor type induction motors.
Reluctance motor.
AC slip ring IM.
DC series motor.
Capacitor type induction motors.
Reluctance motor.
AC slip ring IM.
Answer
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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?
45 HZ
48.5 Hz
50 Hz
48 Hz
45 HZ
48.5 Hz
50 Hz
48 Hz
Answer
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Electrical Machines
No load saturation characteristics are plotted between
no load voltage and field current
no load voltage and armature current
short circuit current and armature current
short circuit current and field current
no load voltage and field current
no load voltage and armature current
short circuit current and armature current
short circuit current and field current
Answer
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