3. Electrical fundamentals - Q&A
168 questions found
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The series wound generator`s terminal voltage will, when below saturation
- increase with an increase in load.
- decrease with an increase in load.
- decrease with a decrease in rotational speed.
Anyone can explain ?
A small air gap between magnetic poles results
- in a weaker field than a large air gap, for the same magnetising force.
- in a stronger field than a large air gap, for the same magnetising force.
- in the same field as a large air gap, for the same magnetising force.
Anyone can explain ?
An inductor has 1,000 turns of wire and a cross sectional area of 0.001m2. If the core has a permeability of 0.000,001 and the coil is 0.1m. What is the value of the inductor?
- 100microH.
- 100mH.
- 10mH.
Could someone explain this one.
The dots on the transformer symbol shown are called, and indicate
- phasing dots, point that have the opposite polarity at the same moment in time.
- phasing dots, point that have the same polarity at the same moment in time.
- quadrature dots, points are 90o out of phase.
Please write your question here.
A DC generator armature has 6 poles and is lap wound. The number of brushes required are
- 2.
- 3.
- 6.
Please write your question here.
If an AC sine wave has an RMS value of 5V its peak value is
- 6.37 V.
- 7.07 V.
- 14.14 V.
Peak value is 1.414 the effective value
In a 4:1 step-up transformer, 120V is applied to the primary, and the load on the secondary is 1600 Ohms. What is the current in the primary?
- 0.075A
- 1.2A
- 3A
Can anyone explain that?
A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value. What is the voltage drop across each resistor?
- 12 volts.
- 24 volts.
- 3 volts.
why?
What is the power dissipated in a 500 ohm resistor with a 3A flow?
- 4.5 kW.
- 1.5 kW.
- 750 kW.
How?
If the phase voltage in a star connected generator is 200V what will be the line voltage?
- 115V.
- 346V.
- 200V.
How?
What is the current through resistor C?
- 4.5A
- 18A
- 9A
Someone can explain please?
If you apply this waveform to this circuit, what is the output across the capacitor?
- Pulsed negative
- Pulsed positive
- Zero
can someone explain?
Formation of white crystals of potassium carbonate on a properly serviced Ni-cd battery indicates
- over charged.
- full charged.
- under charged.
why old batteries wich were too much discharged produce white crystas?
A starter generator has a
- low resistance series field and a low resistance shunt field.
- low resistance series field and a high resistance shunt field.
- high resistance series field and a low resistance shunt field.
can someone explain pls?
A shunt is used with
- an ammeter.
- a voltmeter.
- an ohmmeter.
please explain
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?
- 205 amps.
- 5 amps.
- 9 amps.
why please
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?
- 205 amps.
- 5 amps.
- 9 amps.
why please
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?
- 205 amps.
- 5 amps.
- 9 amps.
why please
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?
- 205 amps.
- 5 amps.
- 9 amps.
why please
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?
- 205 amps.
- 5 amps.
- 9 amps.
why please
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?
- 205 amps.
- 5 amps.
- 9 amps.
why please
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?
- 205 amps.
- 5 amps.
- 9 amps.
why please
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?
- 205 amps.
- 5 amps.
- 9 amps.
why please
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?
- 205 amps.
- 5 amps.
- 9 amps.
why please
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?
- 205 amps.
- 5 amps.
- 9 amps.
why please