Prepare for ONGC Assistant Technician (Electrical) and Junior Technician recruitment examination with official previous years' solved question papers across Basic Electrical Principles & Ohm's/Kirchhoff's Laws, Magnetism & Electromagnetic Induction, AC Fundamentals & Polyphase Circuits, Transformers & Substation Maintenance, DC Machines & 3-Phase Induction Motors, Synchronous Alternators & Rig Power Generation, Motor Control Centres (MCC) & Switchgear Protection, Flameproof (Ex-d) Equipment for Oil & Gas Hazardous Areas, Underground Power Cabling, Electrical Measuring Instruments, Industrial Earthing Systems, and Workshop Electrical Safety Standards.
Marking pattern: +1.00 positive, 0.00 negative marking (Official ONGC CBT Scheme — No Negative Marking; 100 Questions, 100 Marks).
What is the main condition for grouping battery cells in series in order to get maximum current through load resistance?
The core of transformer is made up of:
The water from the river stream is diverted to a channel through a diversion structure called:
How many times more are wet steam geothermal fields available in the world compared to dry steam fields?
In indicating instruments, the controlling torque acts in the opposite direction to the:
Squirrel cage induction motors cannot be started by introducing external resistance in its rotor circuit because:
The maximum operating voltage of high voltage underground cables is up to:
In DC motors, the line which bisects the angle between two centres of the adjacent poles is called:
Which impurity is added to a pure semiconductor to obtain a p-type semiconductor?
In alternators, the distribution factor is defined as the ratio of EMFs of:
In which of the following ways are the primary and secondary windings of an auto transformer connected?
In the transistor symbol, the arrowhead indicates the direction of:
A $0.9\text{ pf}$ (lagging) load draws $120\text{ A}$ current from $230\text{ V}$, single phase AC supply mains. Calculate the value of true power.
When the induction machine runs at a higher speed than the synchronous speed, the machine will then work as a/an:
Instantaneous relays have operating time less than:
The silicon transistors are more widely used than germanium transistors because:
It is easy to remember how to use a fire extinguisher if you simply remember the acronym:
The electron gun of a Cathode Ray Oscilloscope has:
The main function of a commutator in a DC generator is:
The magnitude of the induced EMF and the direction of the induced current in the rotor conductor of an induction motor is given by:
When two equal and opposite forces having different lines of action tend to cause angular distortion in a body, the forces applied are known as:
Which of the following is variable loss in DC generators?
The wind speed at which a wind turbine starts delivering shaft power is called:
In DC machines, laminations are used in armature to reduce:
In circuit a breaker, a contact assembly consists of moving contacts which move inside the fixed contacts. This type of contact is called: