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UPPCL JE 2017: Mini Mock 3
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Question 1
The network shown below is initially at rest. What is the Steady current I when the switch S is closed at t=0 ?
Question 2
Assuming that the junction diode is ideal in the circuit in Figure, the current through the diode is
Question 3
In a specimen of iron, the flux is alternating at 50 Hz such that maximum flux density is 1.5 T. If the hysteresis power loss/m3 is 93,000 W, the hysteresis coefficient of the specimen (assuming loss ) is
Question 4
AC Voltmeters use diodes with
Question 5
At starting, the winding of a 220 V, 50 Hz split-phase induction motor has the following values:
Main winding: R = 10 Ω; XL = 25 Ω
Starting winding: R = 25 Ω; XL = 15 Ω
Consider angle b/w starting winding current & main winding current = 37.7o.
What is the maximum starting torque if k = 0. 53?
Question 6
A circuit breaker is rated as 1500 A, 1000 MVA, 33 kV, 3-second, 3-phase oil circuit breaker, the rated symmetrical breaking current is
Question 7
Consider the following circuit.
What is the equivalent resistance between points A and B when
What is the equivalent resistance between points A and B when
Question 8
What will be the power dissipated in the switch shown at ON and OFF state?
Question 9
A string of suspension insulators has three discs. If the disc nearest to the conductor flashes over (i.e. breaks down), then,
Question 10
For a given load, the normal field excitation of synchronous motor is that which gives …………. power factor.
Question 11
Which is the appropriate sign convention used in case of velocity transducer?
Question 12
If the relative permittivity of the medium increases, the electric intensity at a point due to a given charge
Question 13
If in Fig., the ripple factor is 5% and the ripple voltage (r.m.s.) is 4 V, then d.c. voltage is
Question 14
In CRO, which section is responsible for stabilizing a repeating signal
i) Vertical system
ii) Horizontal system
iii) Trigger system
i) Vertical system
ii) Horizontal system
iii) Trigger system
Question 15
A cloud is at a potential of relative to the ground. A charge of 40 C is transferred in lightning stroke between the cloud and the ground. The energy dissipated is
Question 16
The conductance of the circuit shown in Fig. is ……………………
Question 17
The output of sweep generator is:
Question 18
The total secondary voltage in a centre-tapped full-wave rectifier is 125 V r.m.s. Neglecting the diode drop, the r.m.s. output voltage is
Question 19
The potential at a point due to a charge is 9 V. If the distance is increased three times, the potential at that point will be
Question 20
Which is correct for insulators in overhead lines?
i. low insulating resistance
ii. high relative permittivity
iii. low puncher strength
iv. partly filled impurities
i. low insulating resistance
ii. high relative permittivity
iii. low puncher strength
iv. partly filled impurities
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ESE & GATE EEGeneralDec 3ESE & GATE EE