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EE PB2

Quiz by Pablo Escobar

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100 questions
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  • Q1

    A 15 hp, 230-V, 1800 rpm shunt motor has an efficiency of 90% at full load. The resistance of the field is 440 ohms. What is the full-load armature current?

    56.02 A

    54.75 A

    53.54 A

    51.26 A

    30s
  • Q2

    A 15 hp, 1200 rpm, 230 volts dc shunt motor has an armature and field resistances of 0.25 and 100 ohms respectively. The full-load efficiency is85%. What would be the starting resistance if the armature current will be limited to 200 A at full-load load value? (Troubleshoot: 200%)

    1.75

    2.04

    1.66

    1.84

    30s
  • Q3

    The primary disadvantage of FM in AM is

    greater capture effect

    FM has a greater bandwidth than AM

    Excessive use of spectrum space

    Noise immunity

    30s
  • Q4

    As a loop of wire with a resistance of 10 Ω moves in a constant non-uniform magnetic field, it loses kinetic energy at a uniform rate of 4.0 mJ/s. The induced current in the loop:

    10 mA

    20 mA

    cannot be calculated from the given data

    30 mA

    30s
  • Q5

    The boundary of the protection system is determined by the location of

    current transformers

    circuit breakers

    voltage transformers

    Protective relays

    30s
  • Q6

    The illumination of a surface 3.40 m directly below a light source is 25 lux. Find the intensity of the light source.

    347 cd

    289 cd

    393 cd

    231 cd

    30s
  • Q7

    A certain voltmeter has an internal resistance of 10k-o and a range from 0 to 100 V. To give it a range from 0 to 1000 V, one should connect:

    100k-o in series

    90k-o in series

    90k-o in parallel

    100k-o in parallel

    30s
  • Q8

    Zero-sequence current will flow in a transmission line when there is

    an overvoltage in the line due to switching

    a line to line fault

    a fault across all three phases

    double line to ground fault

    30s
  • Q9

    A uniform magnetic field makes an angle of 30◦ with the z axis. If the magnetic flux through a 1-m2 portion of the xy plane is 5 Wb then the magnetic flux through a 2-m2 of the same plane is __ Wb.

    8

    5

    4

    10

    30s
  • Q10

    The changes in volume of transformer cooling oil due to variation of atmospheric temperature delay during day and night is taken care by which part of the transformer?

    breather

    buchholz relay

    conservator

    bushing

    30s
  • Q11

    Which of the following will you connect to make a galvanometer into an ammeter?

    a low resistance in series

    a high resistance in parallel

    a low resistance in parallel

    a high resistance in series

    30s
  • Q12

    Which of the following will you connect to make a galvanometer into an voltmeter?

    a high resistance in series

    a low resistance in series

    a high resistance in parallel

    a low resistance in parallel

    30s
  • Q13

    A charged capacitor and an inductor are connected in series. At time t = 0 the current is zero, but the capacitor is charged. If T is the period of the resulting oscillations, the next time after t = 0 that the charge on the capacitor is a maximum is:

    T

    T/2

    2T

    T/4

    30s
  • Q14

    A charged capacitor and an inductor are connected in series. At time t = 0 the current is zero, but the capacitor is charged. If T is the period of the resulting oscillations, the next time after t = 0 that the charge on the inductor is a maximum is:

    2T

    T/2

    T/4

    T

    30s
  • Q15

    Three 100 KVA single phase transformers are connected in closed delta to supply a three-phase load and the total output power is 300 KVA. If one of these transformers is to be removed and the transformer bank is operated as an open-delta connection, what will be the new output of this new connection in kVA?

    50

    200

    57.7

    100

    30s

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