Set 5 - Marine Electro Technology E Pariksha online questions

1. When reading electrical motor controller diagrams, it helps to know that ____________.
paths in the control circuit are drawn as heavy lines and in the power circuit as lighter lines
current paths in the power circuit are drawn as heavy lines and in control circuit as lighter lines
circuits subject to 500 volts or greater are drawn as heavy lines and below 500 volts as lighter lines
circuits subject to 500 volts or greater are drawn as light lines and below 500 volts as heavy

2. .Where a thermal-acting breaker is required to be used in an area of unusually high, low, or constantly fluctuating temperatures, an ambient compensating element must be used. This element consists of a
Cylindrical spring on the contact arm.
Conical spring on the contact arm.
Second bimetal element
Second electromagnet

3. Which of the following precautions should you take when securing propulsion generators and motors for an extended period of time?
Disconnect the brush pigtails from their contacts and circulate air through the units.
Disconnect the brush pigtails from their contacts and discharge carbon dioxide into the units to keep them dry.
Lift the brushes from commutator collector rings and use the built-in heater to prevent moisture accumulation.
brushes from commutator collector rings and circulate cool dry air through the units.

4. Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?
the machine on both ends so as to allow the air and dust to escape.
Be certain that the circuit breaker is opened and tagged on the feeder panel.
Be certain that the air is clean and as dry as possible
All of the above

5. 52When testing a capacitor with an analog type ohmmeter, a good capacitor will be indicated when __________.
there is no meter deflection
the meter deflects to a low resistance value and remains there
Insulation varnish flaking.meter deflects to a low resistance value and slowly increases towards infinity
the meter deflects to a low resistance value and increases rapidly to a higher value, but stays fairly low

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Correct answers: