ntpc electrical engineering questions

National Thermal power Corporation

Management Trainee

Electrical Engineering Questions

• How many slip rings are there in 3phase synchronous motor?
• How the speed of synchronous motor is controlled?
• Speed control of induction motor?
• When power supply is supplied to heater coil it glows while simple wire does not glow. Why?
• A synchronous generator having inertia constant 4 and having rating of 100MVA. What will be energy stored by the machine?
• A transformer having ratio 20:1. The secondary load is 0.6 ohm and the voltage across it is 6 V what will be the primary current?
• A RC circuit having r=0.8ohm, c=2.5micofarad what will be the time constant?
• Find load impedance if c=0.1 micro farad?
• Two capacitors connected in series the equivalent capacitance is 0.03uf and when connected in parallel the equivalent capacitance is 0.16uf find out the ratio of the two capacitance?
• An L-c circuit having frequency 1/sqrt (LC) what will the equivalent impedance?
• An inverting op-am having input with resistance in series and a capacitance in feedback operates as a.?
• A current having fundamental and third harmonics what will be the rms value of the current?
• Peak to peak value of voltage if rms voltage is 100V.
• Rms voltage.
• What is the approx efficiency of nuclear power plant?
• What is the average current of a single phase full wave rectifier firing at angle alpha?
• What is the function of freewheeling diode?
• When SCR stops conduction? (holding current)
• For measuring current why shunt resistance is used?
• For economic operation of plant what is the condition?(taking into account the penalty factor)
• Incremental fuel cost of two plants is given and a load is given. Find out the load sharing for economic operation of the plant?
• A two port network is represented by ABCD parameters. What will be condition for the two port network to be symmetrical?
• Size of the conductor is determined by .
• Which Surface is suitable for grounding?

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