The charging of a capacitor through a resistance follows which of the following law: Square law Linear law Exponential law None of these Correct answer: 3. Exponential law
The relative permittivity and capacitance of a capacitor are: Inversely proportional to each other Directly proportional to each other Independent of each other Correct answer: 2. Directly proportional to each other
The capacitance of parallel plate capacitor doesn’t depend on which of the following parameters: Medium between plates Area of plates Metal of plates Separation between plates Correct answer: 3. Metal of plates
Two resistors of 10 and 20 ohms are connected in parallel. If power dissipated in 10 ohms resistor is 10 watts, then power dissipated in 20 ohms resistor is: 2.5 watts 5 watts 10 watts 20 watts Correct answer: 2. 5 watts Voltage across 10 ohms resistor can be calcualted from formula: V2=P*R = 10 … Read more
Of the two bulbs in a room, one glows brighter than other. Which bulb has the larger resistance: Bright bulb Dim bulb Both have same resistance Can’t predict Correct answer: 2. Dim bulb The dim bulb has larger resistance. P = V2/R
The power transfer will be maximum when load resistor will be equal to: 2.5 Ω 5 Ω 6 Ω 7.5 Ω Correct answer: 4. 7.5 Ω Solution:
Variable speed operation is preferred in which of the following application: Exhaust fan Water pump Refrigerator Ceiling fan Correct answer: 4. Ceiling fan
The width of depletion layer of PN junction: Increases with heavy doping Decrease with light doping Is increased under reverse bias Is independent of applied voltage Correct answer: 3. Is increased under reverse bias
n-type silicon is obtained by doping silicon with: Aluminum Boron Germanium Phosphorous Correct answer: 4. Phosphorous
Which of the following is correct about donor type impurities: They create excess free electrons They have five valence electrons They are used to make N-type semiconductors All of these Correct answer: 4. All of these