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Explain the principle of operation of an auto transformer. Write its merits and de merits as compared to two-winding transformer.
A Sinusoidal voltage of 24 Volts and frequency 1 KHz is applied across a resistance of and capacitance of 50 in series. Determine Voltage across capacitance.
A series resonant circuit is made of an inductive coil in series with a 2 capacitor. If the resonant frequency is 10KHz and Bandwidth 100 Hz, find R and L of the inductive coil.
The circuit shown in following figure consists of three load branches. Find Current in each branch.
The circuit shown in following figure consists of three load branches. Find Power consumed in each branch.
The circuit shown in following figure consists of three load branches. Find current drawn 'T' from supply-
The circuit shown in following figure consists of three load branches. Find -Power factor of the supply current.
.Explain the voltage buildup phenomenon in a D.C. shunt generator Discuss load characteristics of D.C. shunt and series generators.
Derive an e.m.f. equation of a transformer. A 250 V/6600 V, 50 Hz, 1-phase transformer has a core of cross section 500 and the flux density is 0.707 T. Determine the no. of turns in each winding of the transformer.
A Sinusoidal voltage of 24 Volts and frequency 1 KHz is applied across a resistance of and capacitance of 50 in series. Determine Voltage across resistance.
A 400Volt wave wound D.C. motor has o pores and a constant flux of 20 mWb per pole. Its armature has 302 conductors with full load armature current of 100 A and armature resistance . Determine Motor speed on No load.
A 400Volt wave wound D.C. motor has o pores and a constant flux of 20 mWb per pole. Its armature has 302 conductors with full load armature current of 100 A and armature resistance . Determine Motor speed on full load. Assume a no load armature current of 5A.
Explain principle of operation and application of permanent magnet moving coil instrument.
A moving oil instrument has coil resistance of and full scale deflection current of 5mA. If it is to be used as voltmeter of 0 - 100V, calculate the value of resistance to be inserted in series with the coil.
With a neat diagram describe the working principal of CRO. Give its uses.
Explain "two- Wattmeter method to measure power in 3-phase circuits.
In an experiment of 2 - Wattmeter method the total power measured was 30 kW at 0.7 p.f. lagging.
An inductance can store energy in the form of.......................... (Heat/Electric Field/Magnetic Field)Giving due justifications fill in the blank by choosing suitable words from the brackets.
A Sinusoidal voltage of 24 Volts and frequency 1 KHz is applied across a resistance of and capacitance of 50 in series. Determine Phase angle.
A Sinusoidal voltage of 24 Volts and frequency 1 KHz is applied across a resistance of and capacitance of 50 in series. Determine Current.
Find the current in resistance as shown in Figure using Norton's Theorem.
State Thevenin's Theorem.
Using Nodal Analysis, find the voltage as shown in Figure
State "Superposition Theorem".
Explain, why an Induction motor cannot develop torque while running at synchronous speed?
Draw a labeled Phasor diagram of a transformer on lagging load.
What are the various types of torques acting in all indicating instrument? Give significance of each one.
What value of capacitance will have a capacitive reactance on 150Hz that is equal to the inductive 'reactance of a 0.06 Henry Inductor at 50 Hz?
State and prove "Maximum Power Transfer Theorem" for D.C.Circuits.
A 60 Hz induction motor runs at 3510 rpm. The synchronous speed is expected to be ......... rpm. (1800,3500,3600).Giving due justifications fill in the blank by choosing suitable words from the brackets.
A single phase transformer is working at maximum efficiency. The Cu losses are 100 W. The iron losses would be ....... (25W, 50W, 100W, 200w).Giving due justifications fill in the blank by choosing suitable words from the brackets.
Instrument which can measure only DC and not AC is of ..........(PMMC type/Repulsion type/Dynamometer type) Giving due justifications fill in the blank by choosing suitable words from the brackets.
When the current and voltage in a circuit are out of phase by 90°,the real power in the circuit is ......... (zero/undefined/maximum)Giving due justifications fill in the blank by choosing suitable words from the brackets.
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and capacitance of 50 
in series. Determine Voltage across capacitance.
capacitor. If the resonant frequency is 10KHz and Bandwidth 100
Hz, find R and L of the inductive coil.
and the flux
density is 0.707 T. Determine the no. of turns in each winding of the
transformer.
. Determine
Motor speed on No load.
and full scale deflection current of 5mA. If it is to be used as voltmeter of 0 - 100V,
calculate the value of resistance to be inserted in series with the coil.
resistance as shown in Figure using Norton's Theorem.
as shown in Figure