Electronic Principles The core of an electromagnet is said to be in saturation when: None of these changing the polarity of the current in the coil changes the polarity of the magnetic field around the core an increase in current through the coil causes no further increase in the mmf the core is permitted to move freely within the coil frequent changes in the direction of current through the coil causes heating effects in the core material None of these changing the polarity of the current in the coil changes the polarity of the magnetic field around the core an increase in current through the coil causes no further increase in the mmf the core is permitted to move freely within the coil frequent changes in the direction of current through the coil causes heating effects in the core material ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor? 250 µA 350 µA 300 µA 0.25 µA None of these 250 µA 350 µA 300 µA 0.25 µA None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles The equivalent of 1 kV is: 1000 V None of these 1.00 V 100 mV 1000 mV 1000 V None of these 1.00 V 100 mV 1000 mV ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Reducing the amount of current through an inductor: multiplies the value of inductance by four None of these has no effect on the inductance multiplies the value of inductance by two reduces the value of inductance by one-half multiplies the value of inductance by four None of these has no effect on the inductance multiplies the value of inductance by two reduces the value of inductance by one-half ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current? None of these 0.3 A 0.6 A 0.4 A 0.2 A None of these 0.3 A 0.6 A 0.4 A 0.2 A ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A typical light switch in your home is a: momentary push button switch toggle switch knife switch None of these rotary switch momentary push button switch toggle switch knife switch None of these rotary switch ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS