Selected Problems (long and Medium) For REE-101
UNIT-I
Q:-1 State and prove maximum power
transfer theorem.
Q:-2 What is the criterion for star –
delta transformation? Develop the relationship for delta to star and star to
delta transformation.
Q:-3 Draw V-I characteristic of
voltage and current sources. Explain source transformation theory in a circuit.
UNIT-II
Q:-1 What are the causes of low power
factor in supply system? Discuss its effect & how power factor can be improved?
Q:-2 Derive resonance condition in
series circuit. Also derive the expression for Bandwidth.
Q:-3 Derive resonance condition in
parallel circuit. Also derive the Quality Factor of the Parallel RLC Circuit at
resonance.
UNIT-III
Q:-1 Derive the relation between line
voltage and phase voltage in three-phase delta connected circuit..
Q:-2 Derive the relation between line
voltage and phase voltage in three-phase star connected circuit. Also derive
the expression for power.
Q:-3 With
the help of connection diagram and the related phasor diagram show that W1 + W2 gives the
total 3-phase power in a
two wattmeter method of power measurement and determine the active three phase
power and load power factor.
Q:-4 Draw and explain the working of
attraction type moving iron instrument.
Q:-5 Derive the torque equation and
explain the working of repulsion type moving iron instrument.
Q:-6 Explain the PMMC instrument.
Also derive the expression for deflected torque.
Q:-7 Explain the construction and
working of Electrodynamics type instrument with diagram.
UNIT-IV
Q:-1 What is B-H curve? Also explain
the hysteresis and eddy current loss.
Q:-2 Explain the analogy between
electric and magnetic circuit with AC excitation.
Q:-3 Explain the working of a
transformer with the derivation of the emf equation for a transformer. Also
discuss the losses in the transformer.
Q:-4 Derive the condition for maximum
efficiency for a Transformer.
Q:-5Explain single phase auto
transformer and give its two applications.
UNIT-V
Q:-1 Derive the expression for EMF
equation for a DC machine.
Q:-2 Draw the characteristics of DC
series motors.
Q:-3 Derive the expression of torque
for dc motor. Also discuss the characteristics of dc shunt motor.
Q:-4 Why a three phase synchronous
motor is not self starting? Discuss use of damper winding for starting a
synchronous motor.
Q:-5 Explain the slip-torque
characteristics of three phase induction motor.
Q:-6 Explain with the help of
diagrams, how a rotating field is produced in the air gap of a three-phase induction motor.
Q:-7 Using double field revolving
theory, explain why single phase induction motor is not self starting? Describe
capacitor start- capacitor run method for starting single phase induction motor
and give any two application of such motor.
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