
EE PB2
Quiz by Pablo Escobar
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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