IETE DIPIETE (old scheme) Electrical Engineering Exam paper

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Q.1 Choose the correct or best alternative in the
following: (2x10)
a. If V represent voltage, R represent resistance, I represent current, W
represent power then which of the following relation is incorrect
(A) I = (B) V =
(C) W = V2/R (D) None of the above
b. Ohms law is not applicable to
(A) Electronic resistors (B) High voltage
(C) High current densities (D) Vacuum diode
c. An induction motor is
(A) Self starting with zero torque.
(B) Self starting with very high torque.
(C) Self starting with smaller torque.
(D) None of the above.
d. In an a.c circuit the ratio kW/kVA is known as
(A) Form factor. (B) Peak factor.
(C) Power factor. (D) Load factor.
e. Which motor would you be select as a drive for an electric clock?
(A) D.C series motor. (B) Universal motor.
(C) Synchronous motor. (D) Squirrel cage induction motor.
f. For three phase star connected circuit
(A) Line voltage = phase voltage.
(B) Line current = phase current.
(C) Line current = phase current.
(D) None of the above.
g. Iron losses in a DC machine take place in
(A) Yoke. (B) Commutator.
(C) Main body. (D) Armature.
h. The efficiency of a Transformer is maximum when
(A) it runs at half of full Load.
(B) it runs at full Load.
(C) its Copper Loss equal to Iron Loss.
(D) it runs at overload.
i. A three phase 440 V, 50 Hz induction motor has a speed of 950 rpm, if the
machine has 6 poles, the % slip would be
(A) 10% (B) 5%
(C) 1% (D) 0.5%
j. Starting torque of a single phase induction motor is
(A) Uniform (B) High
(C) Low (D) Zero
Answer any FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. State and explain Kirchoff’s Current Law and Kirchoff’s Voltage Law
with example. (8)
b. Determine the current flowing in each branch of the circuit shown in
Fig.1 (8)
Q.3 a. Define the following A.C quantities
(i) R.M.S value of alternating current.
(ii) Instantaneous value of alternating current.
(iii) Average value or mean value of alternating current.
(iv) Amplitude.
(8)
b. The equation of an alternating current is i = 42.42 sin 628t.
Calculate
(i) its maximum value
(ii) its frequency
(iii) its R.M.S value
(iv) its average
value
(8)
Q.4 a. What are the different methods of speed control of D.C motors. Explain
in brief. (8)
b. A 6-pole, wave wound shunt generator has 1200 conductors. The useful
flux per pole is 0.02wb, the armature resistance 0.4 ohm and the speed
400rpm. If the shunt resistance is 220ohm, calculate the maximum
current which the generator can deliver to an external load if the terminal
voltage is not to fall below
440V.
(8)
Q.5 a. What are the different losses in a transformer. How these losses varies
with the load? (6)
b. A 50 kVA single phase transformer has on full load a copper loss of
560W and iron loss of 500W.Calculate the efficiency at 50% of full load
for a power factor of unity. (10)
Q.6 a. Explain the principle of operation of 3-phase Induction
motor? (8)
b. A 3-phase, 50Hz induction motor has 8 poles. It runs at a speed of
700rpm. Determine
(i) Synchronous speed.
(ii) Slip
(iii) Rotor frequency at the time of starting.
(iv) Rotor frequency at the given
speed. (8)
Q.7 a. Explain the terms Capacity factor, Maximum load, Annual load factor
and Diversity factor. (8)
b. What factors are considered for the selection of motor for specific
engineering application? (8)
Q.8 a. Give a Brief note on the various Renewable Energy
Resources. (10)
b. If a generating station has a maximum load of 20MW for the year and
the maximum load on the substations were 7.5MW, 6.0MW, 5.5MW, &
4.5MW. Calculate the diversity factor. (6)
Q.9 Write short notes on
(i) Energy
storage. (8)
(ii) E.M.F equation of 1-Phase
transformer. (8)

Q.1 Choose the correct or the best alternative in the following: (2x10)
a. The super - position theorem is applicable to:
(A) Current only (B) Voltage only.
(C) Both current and voltage (D) Current, voltage and power.
b. The difference between the synchronous speed & the actual speed of an
induction motor is known as :
(A) Regulation (B) Back lash
(C) Slip (D) Lag
c. A step up transformer increases
(A) Power (B) Power factor
(C) Voltage (D) Frequency
d. Which d.c. motor has approximately constant speed?
(A) Series motor
(B) Shunt motor
(C) Cumulatively compound motor
(D) All of the above
e. For three phase star connected circuit
(A) Line voltage = Phase Voltage
(B) Line current = Phase current
(C) Line current =_3 Phase current
(D) none of the above
DECEMBER 2010

f. A synchronous motor can operate at
(A) Lagging power factor only
(B) Leading power factor only
(C) Unity power factor only.
(D) lagging, leading and unity power factor
g. In an a.c. circuit, the current
(A) is always in phase with the e.m.f.
(B) always leads the e.m.f.
(C) always lags the e.m.f.
(D) Any of the above depending upon the element (L, C, or R) of the
circuit
h. The speed of a DC motor maybe varied by varying
(A) Field current
(B) Applied voltage.
(C) Resistance in series with armature
(D) Any of the above
i. what will happen if the back emf of a dc motor suddenly vanishes
(A) The motor will run faster than the rated speed
(B) The motor will start hunting
(C) The efficiency of motor will rise abruptly.
(D) The motor will burn
j. While the pole flux of d.c shunt generator remains constant the speed is
doubled. The emf generated will be
(A) four times (B) double
(C) unchanged (D) halved
Answer any FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. State and explain Kirchhoffs laws? (8)
b. A circuit has a resistance of R _ in series with an inductance of L Henries.
With a supply of 240V, 50Hz the power in the circuit is 300W and the
voltage across R is 100V. Find the value of L. (8)
Q.3 a. Derive the E.M.F equation of d c motor? (8)
b. The armature of a 4 pole dc machine is required to generate an emf of
520V on open circuit when revolving at a speed of 660rpm. Calculate the
magnetic flux per pole required if the armature has 144 slots with 2 coil
sides per slot each coil consisting of three turns. The armature is wave
wound (8)

Q.4 a. Explain the working principle of operation of a single phase transformer. (6)
b. A 50kVA , 5000/500V, 50Hz, 1-phase transformer has the high voltage
winding with a resistance of 8 _ and low voltage winding with a resistance
of 0.06 _ . The no load losses of the transformer amount to 1000W.
Calculate the efficiency of the transformer when delivering its full rated
output at a power factor of 0.8. (10)
Q.5 a. Explain the principle of operation of 3-phase induction motor? (8)
b. A 12 pole , 3-phase alternator driven at a speed of 500 rpm supplies power
to a 8-pole, 3-phase induction motor. If the slip of the motor at full load is
3%, calculate the full load speed of the motor. (8)
Q.6 a. What factors are considered for the selection of motor for specific
engineering application? (8)
b. Explain application and advantages of storage batteries? (8)
Q.7 a. Explain the term (8)
(i) Demand factor
(ii) Maximum demand
(iii) load Factor
(iv) Diversity factor
b. What are the advantages of high voltage transmission ? Explain (8)
Q.8 a. What are the different methods of improvement of power factor (8)
b. Explain various modes of power generation ? (8)
Q.9 Write short notes on
(i) Resonance in R-L-C series circuit. (8)
(ii) speed control of D.C shunt motors (8)

a. Kirchoff’s current law is applicable only to ________.
(A) closed loops in a network (B) junctions in a network
(C) electronic circuits (D) electric circuits
b. A capacitor-start capacitor-run induction motor is basically a ________
motor.
(A) two phase (B) ac series
(C) commutator (D) synchronous
c. The dynamic impedance of an R-L and C parallel circuit at resonance is ________.
(A) C/LR (B) L/CR
(C) LC/R (D) R/LC
d. The power factor of an a.c. circuit is equal to __________.
(A) cosine of the phase angle (B) sine of the phase angle
(C) unity for a resistive circuit (D) unity for a reactive
circuit
e. If the line current in a delta connected system is IL, then phase current
will be equal to_________.
(A) IL (B) IL/3
(C) 3/IL (D) IL/2
f. Fleming’s left hand rule is applicable to ____________.
(A) DC generators (B) DC motors
(C) Alternator (D) Transformer
g. A three point starter is considered suitable for dc ______ motors.
(A) series (B) shunt
(C) compound (D) shunt as well as compound
h. The two windings of a transformer are __________.
(A) conductively linked (B) inductively
linked
(C) not linked at all (D) electrically linked
i. The efficiency of a single-phase transformer under open circuit-test
conditions is _________.
(A) 100% (B) 0.00%
(C) 70.7% (D) 57.7%
j. The slip of an induction motor connected to supply, but prevented to
rotate by blocking the rotor through external means would be
___________.
(A) 100% (B) 0%
(C) 3% (D) 50%
Answer any FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. Define the following circuit
elements: (6)
(i) Resistance.
(ii) Capacitance.
(iii) Inductance.
b. Derive the value of the equivalent resistance when a number of
resistances are connected in
series. (4)
c. In the single loop circuit of the fig.1 given below, find the
current I. (6)
Q.3 a. A circuit consists of a pure resistance of 50 and is connected across
ac supply v = 250sin314t. Calculate current in the resistance power
consumed by the resistance. Also write the expression for instantaneous
value of the
current. (8)
b. A pure capacitive circuit offers 31.4 capacitive reactance at 25 Hz.
Calculate how much current does the circuit draw if its terminals are
connected to 230V 50Hz
supply? (8)
Q.4 a. Explain the construction and working principle of a DC
motor. (8)
b. A shunt motor takes a current of 40 A from 230 V supply and runs at a
speed of 1100rpm. Find the torque developed by the armature if the
armature and the shunt field resistances are 0.25 and 23
respectively. (8)
Q.5 a. Draw and explain the equivalent circuit of a single phase ideal
transformer. (8)
b. A 500kVA transformer has 95% efficiency at full load and also at 60%
of full load both at unity power factor.
(i) Separate out the transformer losses.
(ii) Determine the transformer efficiency at 75% full load unity
power factor.
(8)
Q.6 a. Explain split – phase and shaded pole single phase motors with suitable
diagrams. (8)
b. The full load speed of a 3- phase, 230V 4-pole, 50 Hz induction motor is
1445 rpm. Determine the synchronous speed, slip and rotor
frequency. (8)
Q.7 a. Write a note on
biofuels. (8)
b. Give two applications of Shaded pole motor, DC shunt motors, DC
series motors, and Capacitor start
motors.
(8)
Q.8 a. Explain a PV cell with a suitable
diagram. (8)
b. A power station has a maximum demand of 15000kW. The annual load
factor is 50% and capacity factor is 40%. Determine the reserve capacity
of the plant. (8)
Q.9 Write notes on:
(i) Application of DC series motors.
(ii) Power factor and its
improvement. (8+8)

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Ok, as you want the question paper of IETE DIPIETE (old scheme) Electrical Engineering Exam so here I am providing you.

IETE DIPIETE (old scheme) Electrical Engineering Exam question paper

Q.1 Choose the correct or the best alternative in the following: (2
10)
a. Kirchoff’s current law is applicable only to ________.
(A) closed loops in a network (B) junctions in a network
(C) electronic circuits (D) electric circuits
b. A capacitor-start capacitor-run induction motor is basically a ________
motor.
(A) two phase (B) ac series
(C) commutator (D) synchronous
c. The dynamic impedance of an R-L and C parallel circuit at resonance is ________.
(A) C/LR (B) L/CR
(C) LC/R (D) R/LC
d. The power factor of an a.c. circuit is equal to __________.
(A) cosine of the phase angle (B) sine of the phase angle
(C) unity for a resistive circuit (D) unity for a reactive
circuit
e. If the line current in a delta connected system is IL, then phase current
will be equal to_________.
(A) IL (B) IL/3
(C) 3/IL (D) IL/2
f. Fleming’s left hand rule is applicable to ____________.
(A) DC generators (B) DC motors
(C) Alternator (D) Transformer
g. A three point starter is considered suitable for dc ______ motors.
(A) series (B) shunt
(C) compound (D) shunt as well as compound
h. The two windings of a transformer are __________.
(A) conductively linked (B) inductively
linked
(C) not linked at all (D) electrically linked
i. The efficiency of a single-phase transformer under open circuit-test
conditions is _________.
(A) 100% (B) 0.00%
(C) 70.7% (D) 57.7%
j. The slip of an induction motor connected to supply, but prevented to
rotate by blocking the rotor through external means would be
___________.
(A) 100% (B) 0%
(C) 3% (D) 50%
Answer any FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. Define the following circuit
elements: (6)
(i) Resistance.
(ii) Capacitance.
(iii) Inductance.
b. Derive the value of the equivalent resistance when a number of
resistances are connected in
series. (4)
c. In the single loop circuit of the fig.1 given below, find the
current I. (6)
Q.3 a. A circuit consists of a pure resistance of 50 and is connected across
ac supply v = 250sin314t. Calculate current in the resistance power
consumed by the resistance. Also write the expression for instantaneous
value of the
current. (8)
b. A pure capacitive circuit offers 31.4 capacitive reactance at 25 Hz.
Calculate how much current does the circuit draw if its terminals are
connected to 230V 50Hz
supply? (8)
Q.4 a. Explain the construction and working principle of a DC
motor. (8)
b. A shunt motor takes a current of 40 A from 230 V supply and runs at a
speed of 1100rpm. Find the torque developed by the armature if the
armature and the shunt field resistances are 0.25 and 23
respectively. (8)
Q.5 a. Draw and explain the equivalent circuit of a single phase ideal
transformer. (8)
b. A 500kVA transformer has 95% efficiency at full load and also at 60%
of full load both at unity power factor.
(i) Separate out the transformer losses.
(ii) Determine the transformer efficiency at 75% full load unity
power factor.
(8)
Q.6 a. Explain split – phase and shaded pole single phase motors with suitable
diagrams. (8)
b. The full load speed of a 3- phase, 230V 4-pole, 50 Hz induction motor is
1445 rpm. Determine the synchronous speed, slip and rotor
frequency. (8)
Q.7 a. Write a note on
biofuels. (8)
b. Give two applications of Shaded pole motor, DC shunt motors, DC
series motors, and Capacitor start
motors.
(8)
Q.8 a. Explain a PV cell with a suitable
diagram. (8)
b. A power station has a maximum demand of 15000kW. The annual load
factor is 50% and capacity factor is 40%. Determine the reserve capacity
of the plant. (8)
Q.9 Write notes on:
(i) Application of DC series motors.
(ii) Power factor and its
improvement. (8+8)


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