Q. Why we use sine wave in supply system rather than square and triangular wave?
Q. Why transformer does not rotate like induction motor. Inspite both having same principle?
Q. Why the Voltage rises when Leading Power Factor is occurs?
Q. Why the transmitted voltage is multiple of 11 like 11 22?

Q. Why the transformer will burn if DC supply is given?
Q. Why the Substations are labled as 11KV/33KV or 66/11KV etc instead of label with the Power transformer Rating (In MVA/KVA)?
Q. Why the roots of the network function are +ve?
Q. Why the capacitors are connected in delta? What advantage it having than star connection?
Q. Why taping of Transformer is always provided on HT side? why not on LT side?
Q. Why star point of star connected motor is not grounded?
Q. Why soft starter is provided for higher rating motor?
Q. Why pressure coil is named so in wattmeter circuit?
Q. Why PNPN is used as thyristor, but NPNP is not used?
Q. Why OC test is carried out on low voltage side of transformer?
Q. Why OC test is carried out at rated voltage and frequency?
Q. Why neutral point is not required in high transmission line?
Q. Why most of the alternator is connected in star and have high regulation around 30% as compared to transformer?
Q. Why magnets are used in audio speaker?
Q. Why is alternating current used for transmission?
Q. Why does wattmeter’s reading go negative?
Q. Why does Table Fan rotates Clockwise while Ceiling Fan rotates anti-clockwise? Any technical reason?
Q. Why do you get a typical sound when the transformer is put into operation?
Q. Why do we use phase shifting at Current Transformer?
Q. Why do we use neutral contact in a transformer?
Q. Why do we maintain 50hz frequency? What happens when we change this frequency to any other value?
Q. Why do 3 phase motors rotate in the opposite direction when any two phases are interchanged?
Q. Why ceiling fan rotates in anticlockwise direction?
Q. Why capacitors are used in 1 phase induction motors?
Q. Why capacitors are not used in 3 phase induction motors?
Q. Why alternator is operated at lagging power factor? How alternator responses with changing the load?
Q. Why 2-phase induction motors are NOT used in industries even though they have rotating magnetic field?
Q. Which of the following test are to be conducted for the determination of voltage regulation of a transformer?
Q. Where do we locate lightning arrestor in transmission line?
Q. When is star-delta Dol or VFD starters used for the motor? How many times the current rating of the motor wil be drawn on a Dol starter if no OLR used?
Q. What would happen if two voltage sources of different magnitude are connect in parallel?
Q. What will be the body impedance of human body>What will be the maximum allowable earthing resistance value?
Q. What measures will take for cost saving in utility and power generation?
Q. What is vector group of transformer? Why is it required?
Q. What is universal motor?
Q. What is Transmittance?
Q. What is Transmission Line? How it is used? Give examples?
Q. What is Transfer Function?
Q. What is the value of insulation resistance between Neutral and earth of a 65 KVA Generator?
Q. What is the thumb rule for insulation value in bus bars phase to phase and phase to earth for 11 & 33 KV system?
Q. What is the Specific Gravity of Fully charged Lead Acid Batteries?
Q. What is the power factor?
Q. What is the link between Voltage and Form Factor?
Q. What is the function of electrical current transducer voltage transducer in control panel?
Q. What is the frequency of DC Voltage?
Q. What is the effect of hysteresis loss in transformer/machines especially in DC one?
Q. What is the distance between R Y and B wires when the line is going from one sub-station to another sub-station?
Q. What is the difference between Earthing and Grounding?
Q. What is the difference between Alternator & Generator? Outline its working principal?
Q. What is the difference between shutdown and trip?
Q. What is the current carrying capacity of Moose conductor? What are the factors determine the current carrying capacity of any conductor?
Q. What is the constructional difference between LPF wattmeter and ordinary AC wattmeter?
Q. What is the calibration procedure and its requirement of belt weigh feeders?
Q. What is the best method to connect two capacitor bank?
Q. What is the 5p 10 burden in current transformer?
Q. What is Stray Capacitance?
Q. What is single and 2 pole circuit breaker?
Q. What is Power Factor? How it is calculated?
Q. What is PLC? Outline its working Principal?
Q. What is neutral earthing and equipment earthing?What are the advantages of grounding a neutral of a transformer and gernator?
Q. What is meaning of “Motor Frame Size? What is use to determine the motor H.P?
Q. What is mean by reactive power? How it is generated?
Q. What is mean by form factor of the AC current?
Q. What is mean by Absolute Stability?
Q. What is Marginal stability?
Q. What is fault tolerant system ?
Q. What is Earthing Resistance?
Q. What is dynamic time of a numerical or electromagnetic relay?
Q. What is difference between Fixed-Bias Circuit & Self-Bias Circuit?
Q. What is Controllability?
Q. What is a busbar?
Q. What is a brush alternator?What is a brushless alternator? What is the difference between brush and brushless alternator?Which is better between brush and brushless alternator?
Q. What happens with squirrel induction machines if the ends of rotor conductors are kept open?
Q. What happens when a transformer is supplied with direct current?
Q. What happens to the power factor of a transformer when the input voltage exceeds the rated voltage? Will it increase or decrease? Give explanation?
Q. What do you mean by skin effect?
Q. What are the various types of LT panels?
Q. What are the maximum number of joints you can make in a (3x300mm 22KV) cable over +/- 610m?
Q. What are the major causes of a generator breakdown?
Q. What are the applications of pure sine wave inverter?
Q. What are Tachometers?
Q. What are Servomotors?
Q. What are Regenerative control systems?
Q. What are natural control systems?
Q. What are Linear and non linear control?
Q. What are Digital control systems?
Q. We have enough category of AC machines more reliable than DC machine then why we are using DC machines in some application yet?
Q. Wattmeter has two coils in it-the current coil & pressure coil why is the pressure coil so named? How is the power being measured by the Wattmeter?
Q. The ceiling fan rotates in anticlockwise direction Why?
Q. Location of lighting arrestor should be near transformer or not? Why?
Q. Is the transformer induced emf E1 and E2 in same phase or in opposite phase? Explain Why?
Q. Is it possible to increase the capacity of a synchronous generator upto 30% to 50% use to modify the cooling system but the other component remain same? Explain ?
Q. Is it possible to generate electrostatic power? If yes how?
Q. Is current a Vector quantity? If yes then two wires on 90 degree angle must have resulting current equal to zero?
Q. In synchronous machines less slip is useful or more slip is useful? Why?
Q. In residential building electrical installation has been completed. How will you test this new electrical installation of building?
Q. In DC only resistive component exists where as in AC system resistive capacitive & inductive component exists. Why its so?
Q. In a three phase system three wires are of colour red yellow and blue are used to discriminate each phase. Now how will you identify each phase wire without knowing the colour and without any pre information?
Q. If we connect a voltmeter between earth and ground wire how much it will measure?
Q. If the position of rheostat is changed from minimum position to maximum position in D.C shunt motors speed is increased how?
Q. If the capacity of a Transformer is 20/26 then what does 20/26 shows? what is its purpose?
Q. How will you calculate the leakage current?
Q. How we can step-up or step-down the DC voltage directly?
Q. How we can change the direction of rotation of Induction motor?
Q. How to design inductive load for 3 phase 440v and maximum 5 amps for star or delta?
Q. How to can calculate voltage drop in a cable?
Q. How to calculate voltage drop in cables?
Q. How to calculate the voltage drop in cable?
Q. How to calculate and manufacture the 5P20 class CT with require knee point volt?
Q. How reactive power is related to alternator? Wheather it is generated or consumed? Explain ?
Q. How much min BDV of oil in transformer is required when charged it first time in 11kv 66kv and 132 kv of transformer?
Q. How much load is required to convert 100 KW Single Phase load to 3 Phase Load?
Q. How many units will a 40W tube consume in 1hr 15 minutes 20 seconds?
Q. How is UPF Wattmeter different from LPF Wattmeter?
Q. How harmonics are produced in m/c what is its physical significance?
Q. How do we solve for poles and zeros in a circuit dynamics ?
Q. How can we control or deduct harmonics?
Q. How and when synchronous generator acts as a synchronous condenser?
Q. Give brief detail on PID Control ?
Q. Explain what are Single and 2 Pole circuit breaker?
Q. Explain what are busduct and rising main? Where it is used?
Q. Does using a AC MCB in a DC circuit affect the tripping time or the performance?
Q. Does the stator of the Induction machine consume only reactive power? If this is the case so where does the active power in the rotor come from? Explain ?
Q. Describe briefly about key functions of Utility and Power House ?
Q. Consider you have a tripper at your house. The instant you switch on your motor the tripper drops. What could be the problem?
Q. Can you test a VFD panel with Resistive load banks? If Yes How?
Q. Can we recognize if motor is series or shunt by visual inspection? If yes how?
Q. Can we measure reactive power by using only a single wattmeter? If Yes How?
Q. Can VFD step up to 60 Hz if it is designed to receive 50 Hz input? Explain?