Question 1
Digital ElectronicsNumber Systems
What is the binary equivalent of decimal number 10?
Correct Answer: B. 1010
Explanation: Decimal 10 equals 8 + 2, which is 1010 in binary.
Reference: Binary number system fundamentals
BHEL MCQs
Practice questions are arranged in pages of up to 100 MCQs.
Question 2
Analog ElectronicsOperational Amplifiers
For an ideal operational amplifier, the input impedance is assumed to be?
Correct Answer: B. Infinite
Explanation: An ideal op-amp draws zero input current; therefore its input impedance is considered infinite.
Reference: Ideal operational amplifier characteristics
Question 3
Network TheoryCircuit Laws
Kirchhoff’s Current Law is based on conservation of?
Correct Answer: B. Charge
Explanation: KCL follows conservation of electric charge: the algebraic sum of currents at a node is zero.
Reference: Kirchhoff's circuit laws
Question 4
Power ElectronicsPower Semiconductor Devices
Which device is commonly used as a controlled switch in power-electronic circuits?
Correct Answer: A. SCR
Explanation: An SCR is a thyristor widely used as a controlled switching device in power-electronic converters.
Reference: Power electronics fundamentals
Question 5
Measurements & InstrumentationElectronic Instruments
Which instrument is primarily used to display an electrical waveform versus time?
Correct Answer: B. Oscilloscope
Explanation: An oscilloscope displays voltage waveforms and commonly shows their variation with time.
Reference: Electronic measurement fundamentals
Question 6
Control SystemsStability
For a stable continuous-time linear system, poles of the closed-loop transfer function should generally lie in which region of the s-plane?
Correct Answer: B. Left half-plane
Explanation: For an asymptotically stable continuous-time LTI closed-loop system, its poles lie in the left half of the s-plane.
Reference: Classical control-system stability criterion