Solved preview paper 3(101-145)

Q.101. One of the main application of Magneto-resistor
a.) Rectification
b.) Field compensation
c.) Voltage regulation✔
d.) Power amplification

Q.102. Input impedance of an ideal Op- Amp is
a.) Finite
b.) Zero
c.) Infinite✔
d.) Unity

Q.103. For the binary number 1110 1000 the equivalent hexadecimal number is
a.) F9
b.) F8
c.) E9
d.) E8✔

Q.104. In 2's complement from , -2  is
a.) 1011
b.) 1110✔
c.) 1100
d.) 1010

Q.105. The most commonly used logic family is
a.) ECL
b.) TTL
c.) CMOS✔
d.) PMOS

Q.106. ALE stand for
a.) Address latch enable✔
b.) Accumulator latch enter
c.) Address latch enter
d.) None of the above

Q.107. The number of gates in a SCR is
a.) 2✔
b.) 3
c.) 4
d.) 6

Q.108. Relaxation oscillator uses
a.) Tunnel diode
b.) UJT✔
c.) Both tunnel diode and UJT
d.) PIN

Q.109. In overhead lines we generally use
a.) Copper condenser
b.) ACSR conductor✔
c.) Aluminium conductor
d.) None of the above

Q.110. The electric power can be transmitted by
a.) Overhead system
b.) Underground system
c.) Either A or B✔
d.) None of the above

Q.111. Which variety of copper has the best conductivity
a.) Pure annealed copper✔
b.) Hard drawn copper
c.) Induction hardened copper
d.) Copper containing silicon

Q.112. Basic ceramic material is
a.) Limestone
b.) Clay✔
c.) Cellulose
d.) Sand

Q.113. Which of the following insulating material has the highest safe working temperature
a.) Polythene
b.) Bakelite
c.) Mica✔
d.) Empire cloth

Q.114. Thermocouple works on
a.) Thomson effect
b.) Seebeck effect✔
c.) Peltier effect
d.) Joule affect

Q.115. In a commutator
a.) Copper is harder than Mica✔
b.) Mica and copper are equally harder
c.) Mica is harder than copper
d.) None of the above

Q.116. An electric boiler draws 12 A  at 115 V for a period of 6 hours. If the electrical energy costs 30 paisa per kWh,  then cost of boiler operation in ₹ is
a.) 8.284
b.) 3.482
c.) 2.484✔
d.) 1.684

Q.117. A hundred watt 250 volt bulb is put in series with a 40 watt , 250 volt bulb across 500 volt supply. That total resistance offered by both the bulbs in the circuit in home is
a.) 218.75
b.) 318.75
c.) 3187.5
d.) 2187.5✔

Q.118. When a source is delivering maximum power to the load the efficiency will be
a.) Maximum
b.) Below 50%
c.) Above 50%
d.) 50%✔

Q.119. A 12 volt lead acid battery used in a car contains
a.) 10 cell connected in series
b.) 10 cell connected in parallel
c.) 6 cell connected in parallel
d.) 6 cell connected in series✔

Q.120. The force per metre length between two conductors 0.05 m apart carrying 1000 A and 5000 A is
a.) 20 N✔
b.) 5 N
c.) 50 N
d.) 25 N

Q.121. What will be the current passing through the ring shaped air cored cail when the number of turns is 800 and ampere-turn are 3200
a.) 0.25
b.) 2.5
c.) 4.0✔
d.) 0.4

Q.122. In RLC series circuit at resonance frequency the voltage across the resistance is
a.) Much lower than applied voltage
b) Equal to the applied voltage✔
c.) Much higher then applied voltage
d.)Function of the value of inductance

Q.123. An alternating voltage of (160+j120)V is applied to a circuit and the current in the circuit is given by (6+j8)A . The value of the circuit impedance in ohms is given by
a.)19.2-j5.6✔
b.)19.2+j5.6
c.)166+j128
d.)154-j112

Q.124. A resistor R in series with a capacitor C is connected to a 50 Hz , 240 volt supply. The register observe 300 watt 100 volt . The voltage across the capacitor is
a.) 118.17 V
b.) 318.17 V
c.) 218.17 V✔
d.) 418.17 V

Q.125. An alternating current is represented by i=70.7 sin 520t . Then the value of frequency is Hz is
a.) 73
b.) 93
c.) 53
d.) 83✔

Q.126. A battery of 50 cells in series is charged through a resistance of 4 ohm from a 230 volt supply. If the terminal voltage per cell is 2 volt and 2.7 volt respectively at the beginning and at the end of the charge. The charging current at the beginning is given by
a.) 22.5 A
b.) 12.5 A
c.) 32.5 A✔
d.) 18.5 A

Q.127. The power in the wind Pw through a given cross sectional area for a uniform wind velocity V is
a.) Pw=KV^3
b.) Pw=KV^2
c.) Pw=KV✔
d.) Pw=KV^4

Q.128. Which of the following statement is correct ?
a.) Arc in a circuit breaker is interrupted at Maximum current
b.) Arc in a circuit breaker is interrupted at maximum voltage
c.) Arc in a circuit breaker is interrupted at zero current✔
d.) Arc in a circuit breaker is interrupted at minimum voltage

Q.129. Which of the following circuit breaker has high reliability and minimum maintenance
a.) Oil circuit breaker
b.) Airblast circuit breaker
c.) Sf6 circuit breaker
d.) Vacuum circuit breaker✔

Q.130. The differential relaying system respond to
a.) Internal fault✔
b.) External fault
c.) Overvoltage fault
d.) Under current fault

Q.131. To protect the power transformer (Delta star)against internal faults the current transformer will have
a.) Delta - delta connections
b.) Delta - star connections
c.) Star - star connections
d.) Star - delta connections✔

Q.132. For a 400 kV line the spacing between phase conductors is around
a.) 8 m✔
b.) 11 m
c.) 14 m
d.) 17 m

Q.133. Bundled conductors are used to
a.) Reduce inductis of the line
b.) Reduce both inductance and capacitance
c.) Reduce Corona loss
d.) Reduce Corona loss and the line inductance✔

Q.134. The power factor of a system on a 460 volt 3 phase 60 Hz, in which the emitter indicate 10 volt and Watt metre reads 62 kW will be
a.) 0.95
b.) 0.78✔
c.) 0.85
d.) 0.72

Q.135. Which of the following protects the underground cables against mechanical injury
a.) Bedding
b.) Sheath
c.) Armouring✔
d.) None of these

Q.136. The thermal efficiency of a steam power station is
a.) 18%-20%
b.) 25%-30%✔
c.) 40%-50%
d.) 15%-20%

Q.137. Which of the following is not a secondary source of energy ?
a.) Solar power station✔
b.) Diesel power station
c.) Nuclear power station
d.) Thermal power station

Q.138. The synchronous speed of the revolving field depends upon
a) number of poles
b) supply frequency
c) flux
d) a and b are correct✔

Q.139. The frequency of induced emf in the rotor circuit is
a) maximum at stand still✔
b) zero at stand still
c) maximum at synchronous speed
d) none of these

Q.140. If one of the 3-phases of a 3-phase induction motor is disconnected while running at light load, it will
a) stop running
b) continue to run at same speed✔
c) run at low speed
d) run at high speed

Q.141. If the rotor terminals of a 3-phase slip ring induction motor are not short-circuited and the supply is given to the stator , the motor will
a) not start✔
b) start running
c) run at high speed
d) run at low speed

Q.142. Eddy current power loss in a magnetic material can be expressed as
a.)Pe=ke Bm^2t^2f^2 V watt✔
b.)Pe=ke Bm^2tf^2 V watt
c.)Pe=ke Bm t^2 f V watt
d.)Pe=ke Bm^2t^2f^2 V^2 watt

Q.143. In transistor with normal bias, the emitter Junction
a.) Has high resistance
b.) Reverse biased
c.) Has low resistance✔
d.) None

Q.144. Power factor of incandescent lamp is
a.) Zero
b.) Unity✔
c.) 0.8 legging
d ) 0.8 leading

Q.145. The colour of sodium vapour discharge lamp is
a.) Pink
b.) Red
c.) Bluish
d.) Yellow✔

solved preview paper 3 (51-100)

Q.51. The phenomenon of squirrel cage motor some time showing a tendency to run at a very low speed is known as
a.) Cogging
b.) Crawling✔
c.) Damping
d.) Skewing

Q.52. A 5 H- HP 3 phase 400v star connected squirrel cage induction motor meant to drive a milling machine at starting takes about
a.) 40A✔
b.) 100A
c.) 150A
d.) 200A

Q.53. The starting torque of an induction motor can be increased by
a.) Increasing Rotor reactance
b.) Increasing the rotor resistance✔
c.) Increasing the supply frequency
d.) Giving supply through a star delta starter

Q.54. The span for full pitch coil wound for 6 poles is
a.) 180 degree mechanical
b.) 90 degree mechanical
c.) 60 degree mechanical✔
d.) 45 degree mechanical

Q.55. The armature flux opposes the main field flux when load power factor is
a.) Unity
b.) Zero lagging✔
c.) Zero leading
d.) 0.8 leading

Q.56. A commercial alternator has
a.) Rotating armature and stationary field
b.) Stationary armature and rotating field✔
c.) Both armature and field rotating
d.) Both armature and field stationary

Q.57. In alternator damper winding are used to
a.) Reduce Eddy current loss
b.) Prevent hunting✔
c.) Make the rotor dynamically balanced
d.) Reduce armature reaction

Q.58. The magnitude of the resultant magnetic field produced by a three phase current flowing through a three phase winding
a.) The maximum value of flux due to any one phase
b.) 1.5 time the maximum value of flux due to any one phase✔
c.) Half the value of maximum flux due to any one phase
d.) Twice tha maximum value of flux due to any one phase

Q.59. The pitch factor for 5/6 short pitch coil is
a.) 0.966✔
b.) 0.833
c.) 1.0
d.) 3.454

Q.60. Armature reaction in a electrical machine is the effect of
a.) Armature flux on the main field flux✔
b.) Heat produce on the armature winding
c.) Armature current on the output
d.) Armature flux on the output

Q.61. The speed regulation of synchronous motor is
a.) Unity
b.) Zero✔
c.) Infinity
d.) Always less then one

Q.62. The direction of the rotation of an ordinary shaded pole single phase induction motor
a.) Can be reversed by reversing the supply terminal connection to the stator winding
b.)can not be reversed✔
c.) Can be reversed by open circuiting the shading ring
d.) Can be reversed by short circuiting the shading ring

Q.63. In a single phase repulsion motor, torque is developed on the rotor when the brush axis is fixed
a.) At 90° electrical with the stator field axis
b.) In alignment with the stator field axis
c.) At an acute angle with the stator field axis✔
d.) At 90 degree mechanical with the stator field axis

Q.64 . A DC series motor when connected across an AC supply will
a.) Develop torque in the same direction✔
b.) Not develop any torque
c.) Draw dangerously high current
d.) Develop a pulsating torque

Q.67. The armature of a DC machine is made up of laminated sheets to
a.) Reduce hysteresis loss
b.) Reduce Eddy current loss✔
c.) Reduce armature copper loss
d.) Increase dissipation of heat from the armature surface

Q.68. The function of a brush and commutator arrangement in a DC motor
a.) To produce uni-directional torque✔
b.) To produce unidirectional current in armature
c.) To help in changing the direction of rotation of armature
d.) To reduce parking

Q.69. The armature winding of a DC machine is made up of a number of coils distributed in a large number of armature slots instead of placing all the coil in two slots to
a.) Gets sinusoidal EMF at the output terminals
b.) Have minimum heat dissipation from the armature✔
c.) Make the armature dynamically balanced
d.) Get the maximum generated EMF in the armature

Q.70. The maximum permissible operating temperature of class-E insulating material is
a.)130 degree
b.)120 degree✔
c.)180 degree
d.)105 degree

Q.71. The number of parallel paths in the armature winding of a four pole wave connected DC Machine having 22 coil-sides is
a.) 4
b.) 22
c.) 2✔
d.) 11

Q.71. The direction of rotation of a DC motor can be reversed
a.) By reversing the connection of both the armature and the field winding with the supply
b.) By reversing the connection of either the armature or the field✔ winding connection with the supply
c.) By reducing the field flux
d.) By introducing an extra resistance in the armature circuit

Q.72. To have sparkless commutation the armature reaction effect in a DC machine is neutralized by
a.) Using compensating winding and commutating poles✔
b.) Shifting the brush Axis from the geometrical neutral axis to the magnetic neutral axis
c.) Fixing the processes in alignment with the main pole axis
d.) Increasing the field excitation

Q.73. Which type of motor is preferred for traction work?
a.) DC series motor✔
b.) Three phase induction motor
c.) Universal motor
d.) Synchronous motor

Q.74. A solid angle is expressed in terms of
a.) Radians
b.) Degrees
c.) Radian/metre
d.) Steradian✔

Q.75. Glare is reduced by
a.) Increasing lamp height
b.) Using reflectors
c.) Using diffuser
d.) All of the above✔

Q.76. In induction heating which of the following is high
a.) Current✔
b.) Voltage
c.) Frequency
d.) Power

Q.77. The electrodes used for direct resistance heating are made of
a.) Mild steel✔
b.) Copper
c.) Carbon
d.) None of the above

Q.78. In which type of welding current is passed through the metal piece to be joint
a.) Arc
b.) TIG
c.) Resistance✔
d.) MIG

Q.79. In transmission line sag depends upon
a.) Conductor material
b.) Length of span
c.) The tension in conductor
d.) All of the above✔

Q.80. Electroplating is the process of
a.) Removing 1 metal from the other
b.) Coverings superior metal over the inferior metal✔
c.) Refining of metals
d.) All of the above

Q.81. Which of the following motor is used in household refrigerator?
a.) AC series motor
b.) DC shunt motor
c.) Reluctance motor
d.) Single phase induction motor✔

Q.82. Voltage regulator are used to _________the voltage
a.) Increase
b.) Stabilize✔
c.) Decrease
d.) None of the above

Q.83. The direct current system employed for tramways operates on
a.) 3000 V
b.) 1500 V
c.) 750 V✔
d.) 440 V

Q.84. Low frequency operation of overhead line in traction system
a.) Reduce the spacing between substation
b.) Increase the spacing between substation✔
c.) All of the above
d.) None of the above

Q.85. In electrolytic process the electrical energy is converted into
a.) Mechanical energy
b.) Heat energy
c.) Chemical energy✔
d.) None of the above

Q.86. Ajax Wyatt furnace is started when
a.) Field below core level
b.) Fully filled
c.) Field above core level✔
d.) All of the above

Q.87. The output of full wave rectifier contains
a.) Only even harmonics
b.) Only odd harmonics✔
c.) Both odd and even harmonics
d.) No harmonics

Q.88. Which of the following has negative temperature co-efficient
a.) Electrolyte✔
b.) Brass
c.) Silver
d.) Mercury

Q.89. A wire of resistance R has its length and area of cross section doubled heat resistance becomes
a.) R✔
b.) R/4
c.) 2R
d.) 4R

Q.90. The unit of retentivity is
a.) Ampere return
b.) Weber
c.) Ampere turn/metre
d.) Weber/metersquare✔

Q.91. Which material has least specific resistance
a.) Mercury✔
b.) Zinc
c.) Copper
d.) Lead

Q.92. In an a.c. circuit M.I. metres measure
a.) Mean value
b.) Peak value
c.) R.M.S. value✔
d.) Average value

Q.93. Economisers are used to heat
a.) Air
b.) Steam
c.) Feedwater✔
d.) None

Q.94. A coil has 1000 turns and current of 8 ampere causes a flux of 5 milli-weber to it .The inductance of coil will be
a.) 1.0 H
b.) 2.15 H
c.) 1.5 H✔
d.) 2.0 H

Q.95. Internal resistance of dry cell is
a.) 1-15 ohm
b.) 2-5 ohm
c.) 1-1.5 ohm
d.) 0.2-0.4 ohm✔

Q.96. Bronze is an alloy of
a.) Copper and Zinc
b.) Copper zinc and Tin
c.) Copper and Tin✔
d.) None

Q.97. Suitable turbine used for harnessing tidal power is
a.) Francis turbine
b.) Pelton wheel
c.) Kaplan turbine✔
d.) None

Q.98. Advantage of hydropower over Thermal Power is
a.) Low initial cost
b.) Low operatinng cost✔
c.) Continuous power
d.) None

Q.99. Impedance relay can be used for
a.) Earth fault
b.) Phase fault only
c.) Both Earth and phase fault✔
d.) None

Q.100. For energy efficient Motors which of the following is correct
a.) Use more power
b.) Used low quality material
c.) High reliability✔
d.) Less cost

Solved preview paper 3 (1to50)

Q.1. Pelton wheel is which type of turbine?
a.) Reaction turbine
b.) Impulse turbine✔
c.) Both A and B
d.) None of these

Q.2. Hey generating station has a maximum demand of 35,500 kW and has connected load of 6500 kW. The number of units generates are annually 25.6 into 10^7 the demand factor is
a.)0.646
b.)0.746
c.)0.546✔
d.)0.436

Q.3. The principle of dynamically induced EMF is utilised in:
a.) Transformer
b.) Choke
c.) Generator✔
d.)Thermocouple

Q.4. Which of the following is not a part of the dc machine
a.) Armature
b.) Commutator
c.) Field winding
d.) Damping winding✔

Q.5. 8 Ball Pool generator with 16 coils has a two layer lap winding the pole pitch is
a.)32
b.)16
c.)8✔
d.)4

Q.6. The current drawn by a 120 V DC motor with back EMF of 110 V and armature resistance of 0.04 ohms is
a.)5A
b.)25A✔
c.)275A
d.)300A

Q.7. The output indicate on the name plate of any motor is always the
a.) Gross power
b.) Power drawn in KVA
c.) Power drawn in KW
d.) Output power at the shaft✔

Q.8. When voltage in transformer from primary to secondary then it is______.
a.) Multiplied by k^2
b.) Multiplied by K✔
c.) Divided by K^2
d.) Divided by K

Q.9. A 50 Hz operation a single phase transformer has hysteresis loss 200W and Eddy current loss of 100W its core loss at 60 Hz frequency operation will be
a.)432W
b.)408W
c.)384W✔
d.)360W

Q.10. A three phase induction motor with rotor circuit open will
a.) Not run✔
b.) Run normally
c.) Get overheated
d.) Make  noise

Q.11. A 3 Phase 6 pole 50 Hz induction motor is running at 5% slip what is the speed of the motor
a.)850 rpm
b.)900 rpm
c.)950 rpm✔
d.)1000 rpm

Q.12. The starting torque of an induction motor varies as:
a.) f
b)1/f^2✔
c.)1/f
d.)f^2

Q.13. The two bright and one dark lamp method is used for
a.) Determination of phase sequence
b.) Synchronising of 3 phase alternator✔
c.) Synchronising of single phase alternator
d.) Transfer of load

Q.14. Capacitor start capacitor run motor are used in
a.) Hlists
b.) Rolling Mills✔
c.) Mining
d.) Refrigerator

Q.15. Which part of transformer is subjected to maximum heating?
a.) Frame
b.) Core
c.) Winding✔
d.) Oil

Q.16. Open circuit test in a transformer is performed with
a.) Rating Transformer voltage✔
b.) Rated Transformer current
c.) Direct current
d.) High frequency supply

Q.17. The current from the stator of an alternator is taken out to the external load circuit through
a.) Slip ring
b.) Commutator segment
c.) Solid connection✔
d.) Carbon brushes

Q.18. In rotor resistance control methods______with the increase in speed
a.) Torque increase
b.) Torque decreases✔
c.) Slip increased
d.) Losses increase

Q.19. The stator winding of a single phase induction motor is split it into two parts in order to
a.) Improve efficiency
b.) Improve power factor
c.) Develop starting torque✔
d.) Increase speed

Q.20. The cheapest system of in interval wiring is ______wiring
a.)Cleat✔
b.)Casing capping
c.)CTS or TRS
d.)Conduit

Q.21. The rating of fuse wire is always expressed in
a.)Volts
b.)Amperes✔
c.)Ampere-volt
d.) Ampere hour

Q.22. The earth potential is taken as
a.) Zero✔
b.) That of supply
c.) Infinite
d.) None of these

Q.23. Which of the following will be served as a Donor impurity in Silicon ?
a.) Boron
b.) Indium
c.) Germanium
d.) Antimony✔

Q.24. Without a DC source a clipper act like as
a.) Clamper
b.) Chopper
c.) Rectifier
d.) Demodulator✔

Q.25. For germanium P-N junction the maximum value of barrier potential is
a.) 0.3 V
b.) 0.7 V✔
c.) 1.3 V
d.) 1.7 V

Q.26. 2'S complement of the number of 1010101 is
a.) 01010 10
b.) 01010 11✔
c.) 1 10 10 10
d.) 11100 11

Q.27. An XOR  gate produces output only when two inputs are
a.) High
b.) Low
c.) Different✔
d.) Equal

Q.28. The number of flip-flop required in a decade counter
a.) 2
b.) 3
c.) 4✔
d.) 10

Q.29. A 1 mA ammeter has a resistance as 100Ω.  It is to be converted to a 1 A ammeter. The value of shunt resistance is
a.) 0.001 Ω✔
b.) 0.1001 Ω
c.) 100001 Ω
d.) 100 Ω

Q.30. The difference between the indicating value and the true value of a quantity is
a.) Gross error
b.) Absolute error✔
c.) Dynamic error
d.) Relative error

Q.31. Which one of the following metres in a integrating type instruments
a.) Ammeter
b.) Voltmeter
c.) Wattmeter
d.) Energymeter✔

Q.32. A Thermocouple Ammeter give full scale deflection at 10A .  When the ammeter read one fifth of the scale the current will be
a.) 2A
b.) 4A
c.) 4.47A✔
d.) 5.78

Q.33. Which bridge is used to determine frequency
a.) Anderson bridge
b.) De-sauty bridge
c.) Wein bridge✔
d.) Campbell bridge

Q.34. A digital voltmeter has a read out range from 0 to 9999 . When full scale reading is 9.999 V , the resolution of the full scale reading is
a.) 0.001
b) 1000
c.) 3 digit
d.) 1mV✔

Q35. In a rotating electrical machine , the insulation temperature limit for class B type is
a.)105°
b.)130°✔
c.)150°
d.)180°

Q.36. For Arc heating the electrode used are made up of :
a.) Copper
b.) Graphite✔
c.) Tungsten
d.) Aluminium

Q.37. In electric welding major personal hazards are
a.) Welding spatter
b.) Flying Sparks
c.) Harmful infrared and ultraviolet rays from arc✔
d.) All of the above

Q.38. Which of the following need the highest level of illumination
a.) Living room
b.) Kitchen✔
c.) Proof reading
d.) Hospital wards

Q.39. Long distance Railway operated on
a.) 600V dc
b.) 25 kV single phase ac✔
c.) 25 kV 3 phase ac
d.) 15 kV 3 phase ac

Q.40.The speed time curve for urban service has no
a.) Coasting time
b.) Free running period✔
c.) Breaking period
d.) Acceleration period

Q.41. Total flux required in any lighting scheme depends inversely on
a.) Surface area
b.) Illumination
c.) Coefficient of utilisation
d.) Space height ratio✔

Q.42. The least expensive drive is
a.) Belt drive✔
b.) Rope drive
c.) Chain drive
d.) Gear drive

Q.43. The ratio of the primary to secondary voltage of a transformer is 2:1 . The savings in terms of weight of copper required if an auto transformer is used instead of two winding Transformer
a.) 50%✔
b.) 33.33%
c.) 66.66%
d.) 97%

Q.44 cooling of transformer is necessary to
a.) Increase the efficiency
b.) Dissipate the heat generated in the winding✔
c.) Reduce the losses
d.) Reduce humming

Q.45. The all day efficiency of transformer is the ratio of
a.) kWh output and kWh input per day
b.) kWh output and input in a day✔
c.) Output power and input power
d.) Input power and output power

Q.46. For satisfactory parallel operation of two single phase Transformers a number  of conditions are to be fulfilled. A number of conditions are written below. Indicate which of these is not required to be fulfilled
a.) KVA rating of the two Transformers should be equal✔
b.) Transformers should be properly connected with regard to their polarity
c.) Voltage rating of the primary winding should be suitable for supply system voltage and frequency. The turn ratio of the transformer should be equal
d.) The percentage impedance of the 2 Transformer should be equal

Q.47. A 400 V 50 Hz 3 phase induction motor rotate at 1440 RPM on full load. The motor is wound for
a.) 2-poles
b.) 4-poles✔
c.) 6-poles
d.) 8-poles

Q.48. The relation between synchronous speed,  stator  supply frequency and stator number of poles of a three phase induction motor is given by
a.)Ns=P/120f
b.)f=120Ns/P
c.)f=P.Ns/120✔
d.)Ns=120P/f

Q.49. Torque developed by a three phase,  400 V induction motor is 100 N-m . If the supply voltage is reduced to 200 V that developed will be
a.) 50 N-m
b.) 25 N-m✔
c.) 200 N-m
d.) 62.5 N-m

Q.50. For a three phase induction motor having rotor circuit resistance of 6 ohm,  maximum torque occur at a slip of 0.6.  The value of stand still rotor circuit reactance is
a.) 4.44 ohm
b.) 0.36 ohm
c.) 1 ohm
d.) 10 ohm✔