MCQs

The forward voltage drop across a silicon diode is around 0.7 V 2.5 V 3 V 7.75 V Correct answer: 1. 0.7 V

The ratio of reverse resistance and forward resistance of a germanium crystal diode is around 0.0423611111111111 4.16736111111111 41.6673611111111 FALSE

If the graph between current through and voltage across a device is straight line, the device is referred to as Active device Linear device Nonlinear device Passive device Correct answer: 2. Linear device

The crystal diode is employed as A Rectifier A Voltage Regulator An Amplifier An Oscillator Correct answer: 1. A Rectifier

The reverse current in a diode is of the order of µA A kA MA Correct answer: 1. µA

The DC resistance of a crystal diode is Less than ac resistance More than ac resistance The same as its ac resistance none of these Correct answer: 1. Less than ac resistance

In case of a balanced three-phase load, each phase has An equal amount of power One-third of total power Two-thirds of total power None of these Correct answer: 1. An equal amount of power

In case of a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage 0 V 156 V 298 V 90 V Correct answer: 2. 156 V

The total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 Ω is given as Single-phase 16 A; three-phase 0 A Single-phase 16 A; three-phase 8 A Single-phase 32 A; three-phase 16 A Single-phase 8 A; three-phase 4 A Correct answer: … Read more

The voltages in a three-phase system are separated by 120° 180° 45° 90° Correct answer: 1. 120°