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Which of the following conditions must be satisfied for a transistor to be in saturation? 1. Its collector to base junction should be under forward bias 2. Its collector to base junction should be under reverse bias 3. Its emitter to base junction should be under reverse bias 4. Its emitter to base junction should be under forward bias Which of the above conditions are correct?
A transistor is used in common emitter mode as an amplifier. Then a. The base-emitter junction is forward biased b. The base-emitter junction is reverse biased  c. The input signal is connected in series with the voltage applied to the base-emitter junction  d. The input signal is connected in series with the voltage applied to bias the base-collector junction Which of the following statement is true?
For transistor action (a) Base, emitter, and collector regions should have similar size and doping concentrations. (b) The base region must be very thin and lightly doped. (c) The emitter-base junction is forward biased and the base-collector junction is reverse biased. (d) Both the emitter-base junction as well as the base-collector junction are forward biased. Which one of the following pairs of statements is correct?
Match Old name with the new name. Old Name  New Name I. Allahabad Junction a) Pandit Deen Dayal Upadhyaya Junction II. Manduadih railway station b) Prayagraj Junction III. Mughalsarai junction c) Prayagraj Rambaug Railway station IV. Allahabad City railway station d) Banaras Railway Station Choose the correct code given below:
Assertion (A): A p-n junction diode with low junction depth can be used as a solar cell when illuminated by suitable light (wavelength) at the top thin layer above the junction. Reason (R): A p-n junction diode under no condition can be used as a solar cell. It can be used only as a light-emitting diode for optoelectronic applications.
Sourab hires a car at junction A and drives 16 km towards north. He takes a right turn and drives 30 km to reach a bus stand. He now drives 10 km after taking a left turn to reach a petrol bunk. Finally, he takes a left turn and drives 30 km, and stops at Junction B. How far is junction A with respect to junction B?
The following data pertains to the junction of a thermocouple wire used to measure the temperature of the gas stream. Density = 8500 kg/m3, specific heat = 325 J/kg K, thermal conductivity = 40 W/m K and the heat transfer coefficient between the junction and gas = 215 W/m2 K. If thermocouple junction can be approximated as 1 mm diameter sphere, determine how long it will take for the thermocouple to read 99% of the initial temperature difference
A thermocouple junction of spherical form is to be used to measure the temperature of the gas stream. The junction is at 20 degree Celsius and is placed in a gas stream which is at 200 degree Celsius. Make calculations for junction diameter needed for the thermocouple to have thermal time constant of one second. Assume the thermos-physical properties as given below k = 20 W/ m K h = 350 W/m2 K c = 0.4 k J/kg K p = 8000 kg/m3
Two stations Lucknow Junction and Kanpur Central are 110 km apart on a straight track. Farakka Express starts from Lucknow Junction at 7 a.m. and travels towards Kanpur Central at 20 kmph. Another train Patna Express starts from Kanpur Central at 8 a.m. and travels towards Lucknow Junction at a speed of 25 kmph. At what time both trains will meet?
Consider an abrupt PN junction. Let V0 be the built in potential of this junction and VR be the reverse bias voltage applied. If the junction capacitance Cj is 1pF for V0+VR =1V, then for V0+VR =4V what will be the value of Cj?