Official previous years' question bank with solutions for DC Generators & Motors, AC 3-Phase Induction Motors, Transformers, Armature Winding, Industrial Wiring, Battery Maintenance, and Earthing Practices.
Marking pattern: +1.00 positive, -0.25 negative (Official BHEL Artisan Pattern).
What is the typical barrier potential ($V_b$) for a Silicon (Si) PN junction?
When an ohmmeter connected in a circuit indicates infinite resistance, what does it mean?
Why is the Watt-Hour (WH) efficiency of a battery always less than its Ampere-Hour (AH) efficiency?
In a series combination of cells, the Ampere-Hour (AH) rating of the battery is:
If a multimeter set to the current mode is accidentally connected in parallel with a load, what will happen?
Which of the following graphical symbols represents a pilot light or signal lamp?
What is the primary purpose of using charcoal and salt in a pipe earthing system?
What is the primary function of an ELCB in an electrical circuit?
According to IEE regulations for earthing, what is used to earth all poles in an overhead line system?
Which of the following is the standard SI unit of electrical resistance?
A _____ frequency meter operates by using an electromagnet to attract a series of steel reeds, each tuned to a different natural frequency.
During an open-circuit test on a transformer, the following readings are observed:
Voltage = 220 V, Current = 0.4 A, and Power = 66 W.
Find the core loss of the transformer.
Which of the following is NOT a piece of safety equipment?
Which of the following parameters can be directly determined from the open-circuit test of a transformer?
Assuming the same wire gauge, the current-carrying capacity of a copper conductor is higher than that of an aluminum conductor. Why?
Which of the following is used in power supplies for electronic circuits to convert AC to DC voltage?
Which of the following is a graphical PLC programming language based on relay logic diagrams?
In an AC circuit, the instantaneous values of current and voltage are given as $i = 5\sin(314t + 1/6)\text{ A}$ and $v = 20\sin(314t + 1/3)\text{ V}$, respectively. Find the phase angle of the circuit.
According to Indian Electricity (IE) rules, what is the maximum permissible connected load in a lighting sub-circuit for internal wiring?
In which part of a DC generator is the electromotive force (EMF) generated?
The fall-of-potential method is used to measure:
What is the working principle of an Earth Leakage Circuit Breaker (ELCB)?
Which of the following is a common use of a divider in fitting or metalwork?
Which of the following is NOT a typical maintenance activity for DC motors?
What is the primary purpose of drilling holes in the rotating aluminum disc of an induction-type energy meter?