Module Three (B1)1. A capacitor is fully charged after 25 seconds to a battery voltage of 20 Volts. The battery is replaced with a short circuit. What will be the voltage across the capacitor after one time constant? 3. The relative permittivity of a capacitor is: # a) 12.64 volts # b) 7.36 volts c) 0 volts 2. The voltage rating of a capacitor is: # a) the max voltage that can be constantly applied b) the min voltage required to charge c) the normal operating voltage a) the relative permittivity of the dielectric in relation to a vacuum b) the permittivity of dielectric in relation to dry air c) the permittivity of the dielectric 4. Magnetic inclination is the least at the: # 5. Ferromagnetic materials can be magnetized: # 6. Faradays Law States that : # 7. To reduce eddy currents in a transformer you would : # a) reduce the thickness of laminations in the magnetic core b) increase the thickness of laminations in the magnetic core c) reduce the number of turns on the primary winding 8. A transformer has an input of 400V and a ratio of 2:1. If the transformer is delta / star wound, what will the line voltage output be? # 9. What is the phase difference in a circuit with 100V, drawing 0.5 amps, consuming 50 Watts? #
10. In an A.C circuit, what happens if frequency is reduced? # 11. 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? a) 205 amps b) 9 amps c) 4.5 amps # 12. A Transformer has 4500 secondary turns and 750 primary turns. Its turns ratio Is: # 13. Two inductive coils are placed in close proximity with each other at 90 degrees. The number of flux linkages is : # 14. A high pass filter will? #
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- Summer '17
- sajad heidari