If Ie=205 mA, Ic=203 mA, the beta dc is (approx): 200 100 50 25 Correct answer: 2. 100 Explanation: From formula: Ib= Ie – Ic = 205 – 203 = 2 mA Beta dc = Ic / Ib = 203 / 2 = 101.5 ≈ 100
If Rotor of Induction motor is rotating at synchronous speed the torque will be: Zero Low High Infinite Correct answer: 1. Zero Explanation: When the rotor of induction motor turns at synchronous speed the rotor bars would be stationary relative to the magnetic field. Inturn there would be no induced voltage. If induced voltage is … Read more
For capacitive loads the voltage regulation of alternator is: Positive Negative Zero Any of above Correct answer: 2. Negative In case of leading loads the terminal voltage of alternator will rise. Voltage regulation is defined as: VR = {V(nl) – V(fl)}/V(fl) From above relation one can easily understand that a synchronous generator that is operating … Read more
Statement: The topmost conductor in transmission lines is: Reserve phase Ground Neutral For telecom purposes only Correct answer: 2. Ground Explanation: The top most conductor in transmission lines is ground conductor and its basic purpose is to provide protection against lighting thunders
ACSR conductor having 7 steel strands and 52 aluminum strands will be represented by: 7/52 7/57 57/7 52/7 Correct answer: 4. 52/7 Explanation: The convention used for representing strands in ACSR is: Aluminum/Steel Here Aluminum = 52 Steel = 7 So Aluminum/Steel = 52/7
Poly phase means: Only one phase Two phases Many phases None of these Correct answer: 3. Many phases Explanation: The term poly phase in used to describe the system which has many phases. It is used to indicate the electrical systems multiple sinusoidal voltages exist.
Rectification circuits use which type of diode: Zener Diode Normal diode Varactor diode Any of above Correct answer: 2. Normal diode In Electrical Engineering Rectification refers to the conversion of Alternating current (AC) to Direct current (DC). Rectification circuits can use diode for converting AC to DC. Good to know: A Zener diode operates in … Read more
Surge voltage in electric power system can originate due to: Lightning thunders Switching Faults All of these Correct answer: 4. All of these
Humming in transformers happen due to: Winding vibration Difference of number of turns Magnetostriction in core laminations None of these Correct answer: 3. Magnetostriction in core laminations
Which one of the following is programmed using assembly language: Arduino SCADA Microcontroller FPGA Correct answer: Microcontroller Explanation: Arduino uses C/C++ SCADA uses C language Microcontrollers use assembly language (Although C, Java, and Python are targeting Microcontrollers now) FPGA use Verilog and VHDL language