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You Are On Multi Choice Question Bank SET 1277

63851. A dc component is the peak value of a pulse waveform.

63852. In an RL integrating circuit, the output voltage is taken across the inductor.

63853. If the capacitor in an integrator opens, the output has the same voltage as the input.

63854. The rising and falling edges of a pulse waveform contain the higher frequency component.

63855. In an electric circuit, the reaction of a circuit to a given pulse input is known as the pulse response.

63856. In an RC differentiating circuit, the output voltage is taken across the resistor.

63857. In an integrator, when the pulse width of the input is much less than the transient time, the output voltage approaches the shape of the input.

63858. When a 15 V input pulse with a width equal to two time constants is applied to an RC integrator, the capacitor charges to

63859. An integrator consists of a 3.3 k resistor and a 2 F capacitor. A single 30 V, 6 ms pulse is applied to the input. How much will the capacitor charge?

63860. Referring to Problem 5, how long will it take the capacitor to discharge if the internal resistance of the pulse source is 100 ?

63861. With an RL integrator, at the instant of the rising pulse edge,

63862. When a 12 V input pulse with a width equal to one time constant is applied to an RC integrator, the capacitor charges to

63863. Cotton seed track ghee is low in

63864. Interspecies adulteration of milk is detected by

63865. Salt content of casein micelle of bovine milk

63866. Hardness of water is expressed as ppm of-----------------

63867. Essential fatty acid present in milk fat

63868. The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?

63869. To step 110 V ac down to 20 V ac, the turns ratio must be

63870. The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is

63871. If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

63872. A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 . What is the approximate voltage across the load?

63873. How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

63874. In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is

63875. A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is

63876. The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?

63877. The primary winding of a power transformer should always be

63878. A certain amplifier has 600 internal resistance looking from its output. In order to provide maximum power to a 4 speaker, what turns ratio must be used in the coupling transformer?

63879. A transformer

63880. The primary of a transformer is connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, RL, is 100 . The voltage across the load is

63881. To step 120 V ac up to 900 V ac, the turns ratio must be

63882. When a 200 load resistor is connected across the secondary winding of a transformer with a turns ratio of 4, the source "sees" a reflective load of

63883. In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?

63884. When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

63885. What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?

63886. A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 . The load resistance as seen by the source is

63887. If the voltage is stepped up, the current is stepped down, and vice versa.

63888. A step-down transformer has a turns ratio less than 1.

63889. A transformer responds only to dc.

63890. The primary is the winding connected to the source, and the secondary is the winding connected to the load.

63891. A transformer consists of two or more cores that are electrically coupled on a common core.

63892. A reflective load is a load as it appears to the source in the primary of a transformer.

63893. A step-up transformer steps up power.

63894. A transformer changes ac to dc.

63895. A center tap (CT) is a connection at the midpoint of the secondary winding of a transformer.

63896. An autotransformer is one in which the primary and secondary are automatically coupled.

63897. What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

63898. The turns ratio required to match an 80 source to a 320 load is

63899. When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

63900. If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 ?

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