Preview Question paper (1) 81to 100

Q.81. The voltage of super tension cable is up to
a.) 132kV
b.) 66kV
c.) 33kV✔
d.) 220kV

Q.82. Which distribution scheme is employed in metropolitan areas
a.)Radial system
b.)Interconnected system✔
c.)Ring system
d.)None of these

Q.83. A line which connect between substation and distribution transformer
a.)Secondary feeder
b.)Primary feeder✔
c.)Sub transmission feeder
d.)None of these

Q.84. A ratio of average load to maximum load is called.
a.)Plant use factor✔
b.)Diversity factor
c )Load factor
d.)Operation factor

Q.85. In 3Φ Induction motor in order to eliminate cogging the number of stator slot must be
a.)Unequal to number of totor slot and skewed in shape✔
b.)Equal to number of rotor slot
c.)An integral multiple of number of rotor slots
d.)Either B or C

Q.86. A slipring motor run at 290 rpm at full load, when connected to 50Hz supplym Determine the number of pole and slip
a.)P=20, S=3.33%✔
b.)P=40, S=5.79%
c.)P=60, S=0.96%
d.)P=50, S=4.43

Q.87. The rotor of 3Φ induction motor has an impedance of 0.4+j4 ohm per phase at stand still the maximum torque occur at a slip of ______
a.) 10%✔
b.) 15%
c.) 25%
d.) 50%

Q.88. Select the wave that has the least value of form factor
a.)Square wave ✔
b.)Rectangular wave
c.)Triangular wave
d.)Sine wave

Q.89. In a commutation circuit employed to turn off the SCR , satisfactory turn off is obtained when
a.)Circuit turn off time < device turn off time
b.)Circuit turn off time > device turn off time✔
c.)Circuit time constant > device turn off time
d.) Circuit time constant < device turn off time

Q.90. Which of the flowing is true SCR ?
a.)It can block forward voltage and conduct in forward direction
b.)It can block both forward and reverse voltage but conduct in reverse
c.)It can block reverse voltage and conduct in both direction
d.)It can block both forward and reverse voltage but conduct in forward direction✔

Q.91. Holding current is
a.)The minimum current which must pass through the device to remain in th 'ON' stage ✔
b.)Maximum current below which anode current must fall for turning 'ON'
c.)Minimum anode current above which thyristor gets turn 'OFF'
d.)Minimum current below which anode current must fall for turning 'ON'

Q.92. The trapped energy of an inductive load can be feedback to the input supply through a diode known as
a.)Zener diode
b.)Free wheeling diode✔
c.)Power diode
d.)None of these

Q.93. Insulated cable are usually rated by their
a.)Operating Voltage
b.)Operating Voltage and Highest operating temperature✔
c.)Operating temperature
d.)Cost

Q.94.Synchronous machine
a.)Can operate at unity power factor
b.)Can operate at leading power factor
c.)Can operate at lagging  power factor
d.)Can operate at any power factor✔

Q.95. A winding having number of slots equal to number of poles then this winding is called
a.)Concentrated winding✔
b.)Short pitch winding
c.) Full winding
d.)distributed winding

Q.96 Which alternator are more suitable for high speed system
a.)Salient pole
b.) Non salient pole✔
c.)Both A and B
d.)None of these

Q.97.In a Δ connected generator , all of the phase voltage are
a.)Zero
b.)Equal in magnitude✔
c.)One third of total
d.)One sixth of total

Q.98. A ohmmeter is connected across an inductor and the pointer indicate zero ohms .The inductor is
a.)Good
b.)Open
c.)Shorted✔
d.)Partially shorted

Q.99.Moving iron instrument is used
a.)AC and DC both✔
b.)AC only
c.)DC only
d.)None of these

Q 100. For increasing the range of an ammeter, connect
a.)A high voltage resistance in series with the ammeter coil.
b.)A high valur resistance in parallel with the ammeter coil.
c.)A low value resistance in parallel with the ammeter coil.✔
d.)A low value resistance in series with the ammeter coil.