Exam Questions-1 PDF

1. The unit of electrical current flow is measured in B. Amps 2. The unit of electrical resistance is measured in Ohms 3. The unit of electrical power is measured in Watts 4. Electromotive Force is measured in Volts 5. The working voltage of a capaci...

1. The unit of electrical current flow is measured in B. Amps 2. The unit of electrical resistance is measured in Ohms 3. The unit of electrical power is measured in Watts 4. Electromotive Force is measured in Volts 5. The working voltage of a capacitor is the highest voltage that can be steadily applied to it without the danger of the dielectric breaking down. A capacitor used in AC circuits should have a working voltage at least the highest voltage that will be applied to it. greater than c. 50% 6. A field of force exists around a charged body. This is an electrostatic field or sometimes called: B. Dielectric fields 7. Which of the following terms describes the combined resistive forces in an AC circuit? a. Impedance 8. Former operates on the basis of mutual: Inductance 9. Coils offer opposition to the flow of AC through them. This is called: B. Inductive reactance. 10. The strength of a magnetic field increases as: C. More coils are added and placed closer to each other. 11. The effective voltage of sine wave alternating current is instantaneous voltage. C. Less than 12. An increase in the inductive reactance of a circuit is caused by an increase in Frequency and inductance 13. (1) The amount of electricity a capacitor can store is directly proportional to the plate area. (2) The amount of electricity a capacitor can store is inversely proportional to the distance between the plates. C. Both statements are true, 14. When capacitors of different values are connected in series, the total capacitance is ______ that of the lowest rated capacitor a. Less than 15. Capacitors store electrical charges and are sometimes used in DC circuits to: Smooth out slight pulsations in current/voltage 16. formula, C1 + C2 + C3 = Ct; find the total capacitance in a circuit ing three capacitors in parallel with capacitances of.04 microfarads, farads, and 1.3 microfarads. 1.41 microfarads 17. Unless peak values, peak-to-peak values, or average values are specifically called out,. ___ are assumed in an AC circuit. C. Effective values 18. Multiplying farads by 10 to the power of -6 is done to convert farads to: b. Microfarads 19. Multiplying farads by 10 to the power of -12 is done to convert farads to: farads 20. When several inductors are connected together in such a way that there is no inductive coupling, the total inductance is: (Note: Lt = L1 + L2 + L3...) b. Equal to the sum of the individual inductors 21. Lt= 1 / 1/L1 + 1/2 + 1/L3 … When two or more inductors of different values are connected in parallel in a circuit: b. Lt is lower than the lowest rated inductor. 22. The potential difference or electrical pressure difference between two conductors insulated from each other is measured in: Volts 23. Which of the following energies doe snot apply to electrons flowing in a circut” C. Static energy 24. A voltmeter must always be connected in a circuit in whose voltage is to be measu} in an b. Parallel 25. When a voltmeter is connected across a closed switch in perfect condition or a good fuse, it will read: Zero voltage 26. Solve for series/parallel circuit Figure 1, It will be b. 4 27. Solve for series parallel circuit Figure 1 Rt will be c. 9 28. Solve for series parallel circuit E1 will be a. 20 29. Solve for series parallel circuit Figure 1, I1 will be b. 4 30. Solve for series parallel circuit Figure 1, E2 will be a.16 31. Solve for series/parallel circuit Figure 1, I2 will be: c. 2.66 32. Solve for series/parallel series/parallel circuit Figure 1 E3 will be: a. 16 33: Solve for series/parallel circuit Figure 1, I3 a. 1.333 34. When the lights are connected in parallel across a voltage source, the voltage across each light will be: b. Equal to the source voltage 35. 045KV equals: b. 4.5 volts 36. (Refer to fig. 2) Letter A corresponds to which of the following parts of a transistors? B. Emitter 37. (Refer to fig. 2) Letter B corresponds to which of the following parts of a transistor? c. Collector 38. (Refer to fig. 2) Letter C corresponds to which of the following parts of a transistor? a. Base 39. (Refer to fig. 2) Which of the following is correct concerning the bias application and current (positive charge) flow? a. Current flows from the collector (+) to the emitter (-) 40. Forward biasing of a solid-state-device will cause the device to a. Conduct 41. If Input A is 0 and B is 1 then the output will be b. 1 42. (Refer to figure 3) If Input A is 1 and B is 0, then the output will be ________ a. 1 43. If figure 3 was an AND gate and input A was 1 and input B was 0, then the output will be: b. 0 44. If figure 3 was an XOR (EXCLUSIVE OR) gate and input A was 1 and input B was 0, then the output will be: a. 1 45. On an electrical circuit diagram, which point is considered to be at zero voltage? b. The ground reference. 65. Why does a fully charged lead-acid battery does not freeze until extremely low temperatures? a. The acid is in the solution instead of on the plates of the cells. 46. The ground symbol used on electrical schematic diagrams indicates that there is: a. A return path for the current between the source on the load 47. (Refer to fig. 4) What component does figure 4 represent? a. A variable resistor 48. Transferring electrical energy from one circuit to another without the aid of electrical connections are called: b. Inductance 49. If three resistors of 8 ohms, 9 ohms, and 13 ohms are connected in series in a 28-volt circuit, how much current will flow through the 8-ohm resistor? b. 0.93 amps 50. (Refer to fig. 5) The bulb A is listed at 23 amps and the resistor is 5 ohms; how much power is being furnished to the circuit? 2.645 51. (1) If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater. (2) An electrical device that has a high resistance will use more power than one with a low resistance with the same applied voltage. a. Only statement no. 1 is true 52. The power in the secondary of a transformer is equal to the power in the primary. What happens to the current in a voltage step-up transformer with a ratio of 1 to 2 b. The current is step down by a factor of two 53. A 36-volt lead acid battery has 18 cells connected in series; how many volts are each cell? (Consider normally rated cells, not freshly removed from a charger) b. 2.0 volts 54. The permeability of a material is a measure of the ease with which lines of magnetic force can pass through it. Which of the following materials will magnetic lines of force pass the most readily? a. Iron 55. A thermal switch is used in an electric motor b. Opening the circuit to the motor to allow the motor to cool 57. (Refer to fig. 7) Which of the depicted components is a variable capacitor? b. B 58. (Refer to fig. 8) What will the voltmeter read if placed in a circuit as shown? a. System voltage 59. (1)The voltage drop across a circuit is determined by two things: the resistance of the circuit and the amount of current flowing through it (2) If the resistance of a circuit is fixed the voltage drop is determined by the amperage in the circuit c. Both statements are true 60. (1)Total resistance in a parallel circuit will be smaller than the smallest resistor only statement 1 is true 61. If any electrolyte from a lead-acid battery (sulfuric acid and water mixture) is spilled, which of the following procedures should be done? b. Use a sodium bicarbonate solution on the spill followed by a water rinse, 62. Gassing occurs in the cells of a nickel-cadium battery.. Towards the end of the charging cycle 63. (1) A specific gravity correction should be added to the hydrometer reading if the electrolyte temperature is below 59°F. (2) The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80°F. b. Only statement no. 2 is true. 64. What nickel-cadmium battery condition is the following statement describing? "Low internal resistance intensified by high cell temperatures and a high current discharge/charge rate in a constant potential (voltage) charging system." c. Thermal runaway 65. Why does a fully charged lead-acid battery does not freeze until extremely low temperatures? a. The acid is in the solution instead of on the plates of the cells. 66. In ni-cad batteries there is a relationship between cell temperature, voltage, and internal resistance. Which of the following statements best describes this relationship? c. A rise in temperature causes both intern 67. A constant voltage battery charging system functions by changing the amount of current that flows into the battery. What determines the amount of current that flows into the battery? c. The state-of-charge of the battery 68. What may happen if water is added to the cells of a ni-cad battery before the battery is fully charged? a. When the battery becomes fully charged the electrolyte level will be too high and some of the electrolyte may come out of the cell 69. (1) Batteries of different voltages (but similar capacities) can be connected in s series with each other across the charger, and charged using the constant current method. (2) Batteries of different amp-hour capacity and same voltage can be connected in parallel with each other across the charger, and charged using the constant voltage method. C. Both statements are true. 70. A state-of-charge charge of a nickel-cadmium battery can be determined by A measured discharged 71. Nickel-Cadium- lead acid batteries can be charged rapidly by using Constant voltage and varying current 72. If a ni-cad battery is stored for a long period of time, some of the electrolyte in the cells: b. Will be absorbed by the plates. 73. There is a space left below the plates in a lead acid battery cell to allow for the sediment to accumulate, thus: a. Preventing the sediment build-up from contacting the plates and causing a short circuit 74. The end-of-charge voltage (consider a hi-cad battery), measured while the cell b. Depends on the temperature of the cell and method of charging. 75. During an inspection of a ni-cad battery, the inspector notices burn marks on the cell link connections. This could be caused by: a. Improperly torqued cell link connections 76. (1) The electrolyte level of a ni-cad battery is the lowest when the battery is in a discharged condition. (2) The electrolyte level of a ni-cad battery is the highest when the battery is in a fully charged condition. c. Both statements are true. 77. When a small amount of electrolyte from a ni-cad battery comes out the vent and the water evaporates, it will leave a white powder deposit of potassium carbonate. This small amount is: a. Normal and is no cause of concern. 78. Why do battery shops keep the two different types of batteries (lead-acid and ni-cad) in separate locations to service and store? a. Electrolyte from the two batteries is incompatible and will contaminate each other 79. Which of the following requires the most electrical power during operation? (Note: 1 horsepower = 746 watts) A 12-volt motor requiring 12 amperes. 80. How much power must a 24-volt generator furnish to a motor rated at 1/3 hp and 75% efficient? (Note: 1 horsepower = 746 watts) a. 331 watts 81. (Refer to fig. 9) With an ohmmeter connected into the circle 15 ohms 82. The general term for capacitance in terms of charge and voltage is C = Q/E. What does the letter Q symbolize when measuring electrical charge? a. Coulomb 83. Which prefix is used to describe.001 ampere? b. 1 ‘milli’ amp 85. (Refer to fig. 11) With a voltmeter connected into the circuit lamp will the voltmeter read? b. ‘zero’ voltage 86. (Refer to fig 12) With a ohmeter connected will the ohmeter read? c. It will read the resistance of a lamp 87. In a series circuit, the voltage drops across each resistor will total a. Full system voltage 88. (1) In a parallel circuit, the current is equal in all portions of the circuit (2) In a parallel circuit, the total current is equal to the sum of the currents through the individuals branches of the circuit. b. only statement no. 2 is true 89. (Refer to fig. 13) What is the resistance value and voltage drop across R4? b. 340 ohms & 68 volts 90. What component is commonly used as a rectifier in an electrical circuit? b diodes 91. In a parallel circuit three resistors and a 24-volt power supply, what will be the voltage across each resistor 24 volts 92. In a parallel circuit with three 12-ohm resistors across 12-volt battery, what is the total current (It) value in the circuit? a. 3 Amps 93. (1) As the length of a conductor decreases or the cross-sectional area increases the total resistance will decrease the total resistance will decrease (2) As the length of a conductor increases or the cross-sectional area decreases the total resistance will increase c. Both statements are true 94. Which of the following formulas are correct? 1. E = IR 2. I = RE 3. R = E/I 4. E = I/R 5. P = IE 6. I = PE  7. E = P/I 8. P = I/E b. 1, 3, 5, and 7 95. (Refer to fig. 14) What is the total voltage of these three batteries connected in series? b. 3 What is wire number 16? Ground If the throttles are closed and both are in up position will the horn sound? yes