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You Are On Multi Choice Question Bank SET 1040

52001. The specification sheet for the 7812 fixed positive voltage regulator shows that the output voltage could be as low as ________ or as high as ________.





52002. A dc voltmeter reads the ________ while measuring a pulsating dc voltage.





52003. A pass transistor may be used in a series regulator, as the current-carrying device.



52004. For an IC regulator, the input voltage must be at least 2 V above the regulated output voltage.



52005. A switching regulator can be configured as a step-up or a step-down voltage regulator.



52006. IC voltage regulators are sometimes called three-terminal regulators.



52007. Under no-load, a shunt regulator has minimum current through the control element.



52008. A basic voltage regulator consists largely of a reference source, an error detector, and a control device.



52009. Switching regulators are not very efficient.



52010. Load regulation is the percentage change in line voltage for a change in load voltage.



52011. A three-terminal regulator can be used with an external pass transistor to increase the total load current available.



52012. Line regulation is the percentage change in output voltage for a given change in input line current.



52013. The 7812 regulator IC provides ________.





52014. Refer to the given figure. If the zener diode had a rating of 1.7 V, the output voltage would be





52015. Refer to the given figure. This circuit operates at a ________ frequency, and its efficiency is ________.





52016. Voltage regulators keep a constant ________ output voltage when the input or load varies within limits.




52017. Calculate the ripple voltage of a full-wave rectifier with a 75-F filter capacitor connected to a load drawing 40 mA.





52018. What is the instantaneous peak voltage at 250° on a 6 V peak sine wave?





52019. Calculate the positive-going slope of the waveform in the given circuit.





52020. A rectangular wave that has a duty cycle of 50% could be called a





52021. Calculate the duty cycle of the repetitive pulse waveform in the given circuit.





52022. The effective value of a sine wave is equal to





52023. What is the dc voltage of the waveform in the given circuit?





52024. What is the fourth harmonic of a fundamental frequency of 400 Hz?





52025. What is the peak voltage across R3 in the given circuit?





52026. Which point is the trailing edge of the repetitive pulse waveform in the given circuit?





52027. A single-phase induction motor





52028. What is the average voltage when a rectangular wave's base line voltage is 20 V, its peak-to-peak voltage is 50 V, and its duty cycle is 20%?





52029. One revolution of a conductor through the magnetic field of a basic generator will produce two complete sine waves.



52030. A sine wave's peak-to-peak voltage value is always twice its peak voltage value.



52031. If a wave has frequency of 2 Hz, it has a period of ?





52032. 90° equals 1.57 radians.



52033. A 1 Hz sine wave has a period of 1 s.



52034. The instantaneous voltage at 120° on a 5 V peak sine wave equals about –4.33 V.



52035. A sine wave has only one positive maximum point during a cycle.



52036. The sine of a given angle is equal to the ratio of the hypotenuse to the opposite side.



52037. The square, rectangular, and sawtooth waveforms are nonsymmetrical.



52038. 10,000 cycles will occur in 5 s if a sine wave's frequency equals 2 kHz.



52039. If you increase the rotational speed of the conductor in a basic generator, the frequency of the resulting sine wave voltage will increase.



52040. The rms voltage value is a measure of a sine wave's heating effect.



52041. The frequency of the repetitive pulse waveform in the given circuit equals ___.





52042. What is ‘Zero Hour’?





52043. The peak voltage across R2 in the given circuit equals _____.





52044. The frequency of the sine wave in the given circuit equals ___.





52045. Who is the first winner of ‘Lata Mangeshkar Award’ given by the Government of Maharastra?





52046. The magnitude of an alternation that varies from zero is called its _______.





52047. The phase angle between the two waveforms in the given circuit equals _____.





52048. If a sine wave's frequency equals 25 MHz, its period equals _____.





52049. If a sine wave's period equals 50 ms, its frequency equals _____.





52050. A peak current of 12.5 mA is equivalent to ___.





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