If parameter alpha (a) equals 0.9, what is the corresponding value of beta (ß)___________?
Show answer Hide answer
Answer: D. 90
Explanation
Beta is mathematically derived from alpha by dividing alpha by one minus alpha. Substituting an alpha value of zero point nine into this standard formula yields ninety. This relationship highlights how a small change in alpha drastically affects the beta value. Parameter alpha represents the common-base current gain in bipolar junction transistors. Parameter beta represents the common-emitter current gain in standard bipolar junction transistors. The exact formula is beta equals alpha divided by the quantity one minus alpha.
Transistor parameters are essential for designing reliable electronic amplifiers and switching circuits. Engineers use these conversion formulas when transitioning between common-base and common-emitter configurations. Understanding these gains ensures proper signal amplification without causing distortion in audio equipment. Option A is simply nine, which fails to account for the correct mathematical division steps. Option B suggests zero point nine, incorrectly equating beta directly to the input alpha value. Option C gives nine hundred, which results from a decimal placement error during calculation.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. A rheostat differs from a potentiometer in the sense that it_____________?
Show answer Hide answer
Answer: B. has higher wattage rating
A rheostat is typically designed with a higher wattage rating than a potentiometer because it controls current directly. Handling large electrical currents requires thicker resistive elements capable of dissipating subst...
Q2. Which type of machinery experiences heavy load fluctuations ?
Show answer Hide answer
Answer: A. Printing machine
Printing machines experience continuous and heavy load fluctuations during high speed paper feeding and printing. Variable torque demands require printing presses to utilize robust mechanical drives and motor controls. S...
Q3. Which of the following can serve as an indicator of electric intensity ?
Show answer Hide answer
Answer: B. V/A
Electric intensity, or electric field strength, measures potential difference distributed across a specific distance interval. Potential measured in volts divided by distance represented dimensionally matches the intensi...
Q4. When selecting an electric motor to drive a flour mill, which electrical specification is of minimal relevance ?
Show answer Hide answer
Answer: D. Braking
Flour mills require constant running and high starting torque for heavy milling machinery. Electric braking is generally unnecessary for their standard continuous grinding operation. Motors operate steadily without needi...
Q5. Given a 21 V source applied to a circuit where R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, with R1 in series with the parallel pair R2 and R3, what is the current through R2?
Show answer Hide answer
Answer: B. 400 mA
Calculating the parallel resistance of thirty-five and fourteen ohms yields exactly ten ohms of equivalent resistance. Adding the series resistor of five ohms gives a total circuit resistance of fifteen ohms altogether....
Q6. Which device operates on the principle of magnetic torque exerted on a current-carrying conductor in a magnetic field ?
Show answer Hide answer
Answer: D. all of the above
Galvanometers, ammeters, and voltmeters all operate based on magnetic torque exerted on current-carrying conductors inside a magnetic field. When electric current flows through a movable coil positioned within a permanen...