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You Are On Multi Choice Question Bank SET 1337
66851. When a series RC circuit is used as a low-pass filter, the output is taken from across the capacitor.
(A): True (B): False
66852. If the resistor drops 6 V and the capacitor drops 8 V in a series RC circuit, the source voltage equals 10 V.
(A): True (B): False
66853. The current lags the source voltage in a series RC circuit.
(A): True (B): False
66854. If the frequency increases in a parallel RC circuit, the phase angle decreases.
(A): True (B): False
66855. The output voltage from an RC high-pass filter increases as the frequency decreases.
(A): True (B): False
66856. If a 100 resistance is connected to a 100 capacitive reactance in a series RC circuit, the impedance equals 200 .
(A): True (B): False
66857. If the bandwidth of an RC low-pass filter is 20 kHz, the cutoff frequency is also 20 kHz.
(A): True (B): False
66858. The phase angle in the given circuit equals___.
(A): 90° (B): 36.87° (C): 0° (D): 53.13°
66859. Connecting the oscilloscope as shown in the given figure will _____.
(A): measure the voltage across the source (B): measure the voltage across C1, R2, and C2 (C): short R1 (D): short C1, R2, and C2
66860. If the given circuit is used as a filter, the cutoff frequency is _____.
(A): 5 kHz (B): 14.47 kHz (C): less than 5 kHz (D): more than 20 kHz
66861. In a series RC circuit, the phase difference between the capacitor and the resistor voltages ___.
(A): depends on the values of R and C (B): equals 0° (C): equals 90° (D): depends on the value of the input voltage
66862. If the impedance equals 2 k in a parallel RC circuit, the admittance equals ___.
(A): More information is needed in order to find the admittance. (B): 2 kS (C): 4 kS (D): 500 µS
66863. The true power in the given circuit equals ___.
(A): 48.48 mW (B): 296.93 mW (C): 280.64 mW (D): 96.98 mW
66864. In a series RC circuit, the phase difference between the current and the source voltage _____.
(A): depends on the values of R and C (B): equals 0° (C): equals 90° (D): depends on the amplitude of the input voltage
66865. The hypotenuse of the right triangle of a vector diagram for R and XC is _______________.
(A): impedance (B): current (C): voltage (D): power
66866. The magnitude of the impedance in the given circuit equals _____.
(A): 17.14 (B): 24 (C): 70 (D): More information is needed in order to find the impedance.
66867. When the resistance is greater than the capacitive reactance in a series RC circuit, the phase angle is ___.
(A): 0° (B): between 0° and 45° (C): between 45° and 90° (D): 45°
66868. ______________ is shuttled back and forth between the source and load.
(A): True power (B): Reactive power (C): Apparent power (D): Impedance power
66869. If a series RC circuit contains a 120 k resistance and a 160 k capacitive reactance, the impedance equals _____.
(A): 280 k (B): 120 k (C): 160 k (D): 200 k
66870. In a 20 Vac series RC circuit, if 20 V is read across the resistor and 40 V is measured across the capacitor, the applied voltage is
(A): 45 Vac (B): 50 Vac (C): 60 Vac (D): 65 Vac
66871. The process of starting a computer by loading instructions from a secondary storage device into computer memory is called:
(A): Start up (B): Loading (C): Paging (D): Booting
66872. What is the voltage drop across R1 in the given circuit?
(A): 10 V (B): 4.80 V (C): 4.00 V (D): 5.80 V
66873. Power that is measured in volt-amperes is called
(A): impedance power (B): reactive power (C): true power (D): apparent power
66874. As frequency increases
(A): both series and parallel RC impedance decrease (B): series RC impedance decreases and parallel RC impedance increases (C): series RC impedance increases and parallel RC impedance decreases (D): both series and parallel RC impedance increase
66875. How is a 3.9 k resistor color-coded?
(A): red, white, red, gold (B): red, green, orange, silver (C): orange, white, red, gold (D): orange, green, orange, silver
66876. What resistor type is found in SIPs and DIPs?
(A): metal film (B): wirewound (C): metal oxide (D): thick film
66877. Ohm's law is not:
(A): V = IR (B): I = V/R (C): R = IV (D): R = V/I
66878. What are the two major categories for resistors?
(A): low and high ohmic value (B): commercial and industrial (C): low and high power value (D): fixed and variable
66879. How many connections does a potentiometer have?
(A): 1 (B): 2 (C): 3 (D): 4
66880. What current is flowing in the circuit?
(A): 288 kA (B): 2 kA (C): 50 mA (D): 500 A
66881. The six basic forms of energy are:
(A): light, sun, magnetic, chemical, electrical, and mechanical (B): electrical, mechanical, light, heat, magnetic, and chemical (C): electrical, mechanical, sun, heat, chemical, and light (D): potential, sun, light, chemical, electrical, and mechanical
66882. How much energy is stored if 6.24 x 1018 electrons are stored in 4 volts?
(A): 4 joules (B): 1.56 x 1018 electrons (C): 1.56 coulombs (D): 2.496 x 1019 electrons
66883. With Ohm's law:
(A): current is inversely proportional to resistance (B): resistance is directly proportional to voltage (C): voltage is indirectly proportional to power (D): current is directly proportional to resistance
66884. Power is defined as:
(A): the rate at which energy is used (B): watts (C): energy (D): the rate at which energy is generated
66885. What is the most commonly used conductor in electronics?
(A): aluminum (B): copper (C): gold (D): silver
66886. With Ohm's law, no change in resistance means that current and voltage will be:
(A): directly proportional (B): unable to produce energy (C): the same (D): inversely proportional
66887. A potentiometer has how many leads?
(A): 1 (B): 2 (C): 3 (D): 4
66888. What is the ratio of 13 to 47 expressed in percent?
(A): 2.76% (B): 27.7% (C): 3.60% (D): 36.1%
66889. What happens to current and resistance if the voltage doubles?
(A): Current doubles and resistance doubles. (B): Current doubles and resistance is halved. (C): Current remains the same and resistance doubles. (D): Current doubles and resistance remains the same.
66890. One problem with mechanically variable resistors is noticeable in audio circuits as:
(A): scratchy noise (B): lack of bass response (C): variable volume (D): too much treble response
66891. A color code of orange, orange, orange is for what ohmic value?
(A): 22 kilohms (B): 3300 ohms (C): 44000 ohms (D): 33 kilohms
66892. A conductor's cross-sectional area in circular mils for inch is:
(A): 500 cmils (B): 100,000 cmils (C): 1,000,000 cmils (D): 500,000,000 cmils
66893. If a variable resistor's resistance varies in a nonuniform manner as the shaft is moved, it is considered to be:
(A): linear (B): defective (C): not wirewound (D): tapered
66894. Power is measured in units of:
(A): joules x charge (B): joules/work (C): joules x voltage (D): joules/time
66895. How many basic types of resistors exist?
(A): 1 (B): 2 (C): 3 (D): 4
66896. With a complex circuit, a supply source senses:
(A): open circuit components (B): when voltages need to be increased (C): only a single resistive connection (D): when complex currents are needed
66897. How many ohms of resistance allows a current of 720 A to flow when 3.6 kV is applied?
(A): 200 n (B): 5 k (C): 200 k (D): 5 M
66898. Which is the most important step utilized when measuring resistors?
(A): use the highest possible scale (B): keep test leads short (C): zero the meter before using (D): remove power from the circuit
66899. Components designed to oppose the flow of current are called:
(A): insulators (B): conductors (C): resistors (D): heat exchangers
66900. How many amps are used by a 100 watt, 120 volt light bulb?
(A): 1.2 amps (B): 12000 amps (C): 830 mA (D): 12 amps
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