nptel.ac.in · 2018-11-09 · 160 n-m, when the rotor emf makes 120 complete cycles per minute. the...
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Quiz :Assignment0
Due on 2018-07-31, 23:59 IST.
1) 1 point
2) 1 point
Assignment0The due date for submitting this assignment has passed.
As per our records you have not submitted this
assignment.
At a certain dc current, the energy stored in an iron cored coil is 1000J and its copper loss
is 2000W. The time constant (in seconds ) of the coil is
0.25
0.5
1.0
2.0
No, the answer is incorrect.
Score: 0
Accepted Answers:
1.0
Current through and voltage across a device are given in figure. Energy (approximate)
absorbed by
the device
(in J) in the
interval 0≤t≤ 2 sec is
8.5-8.7
9.9-10.1
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3) 1 point
4) 1 point
5) 1 point
6) 1 point
8.5-8.7
Find V0 (in V) in the circuit shown in the figure.
2.5-3.0
3.0-3.5
3.5-4.0
4.0-4.5
No, the
answer is
incorrect.
Score: 0
Accepted
Answers:
3.5-4.0
In the figure shown, the initial capacitor voltage is zero. The switch is closed at t=0, the final
steady-state voltage (in V) across the capacitor is
0
5
20
10
No, the answer is
incorrect.
Score: 0
Accepted Answers:
10
An abc-sequence set of voltages feeds a balanced three-phase star-star connected
system. The line and load impedances are (0.5+j0.75) ohms and (20-j24) ohms respectively. If the
load voltage of the a-phase is VAN = (172.34+j30.39) Vrms . Find out the magnitude of the line voltages
( in V) of the source.
181-200
201-220
221-230
231-240
No, the answer is incorrect.
Score: 0
Accepted Answers:
201-220
A 50 ohms resistor is connected in series with an inductor having internal resistance, a
capacitor and 100V variable frequency supply as shown in the figure. At a frequency of 200 Hz, a
maximum current of 0.7 A flows through the circuit and voltage across the capacitor is 200V. Determine
the inductance (in mH) of the inductor.
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7) 1 point
8) 1 point
222-232
407-417
148-158
583-593
No, the answer is incorrect.
Score: 0
Accepted Answers:
222-232
In the network shown in the given figure, if the voltage V at the time considered is 20V, then
dV/dt (in V/s) at that time will be
1
2
-2
0
No, the
answer is
incorrect.
Score: 0
Accepted
Answers:
2
The impedance (in ohms) seen by the source in the circuit in the figure shown is given by
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9) 1 point
10) 1 point
(0.54+j0.313)
(4-j2)
(4.54-j1.69)
(4+j2)
No, the answer is incorrect.
Score: 0
Accepted Answers:
(4.54-j1.69)
A 6-pole 50Hz, 3-phase induction motor running on full load develops a useful torque of
160 N-m, when the rotor emf makes 120 complete cycles per minute. The power output (in kW) is
17.8-18.2
16.8-17.2
18.8-19.2
15.8-16.2
No, the answer is incorrect.
Score: 0
Accepted Answers:
15.8-16.2
A single phase transformer has a maximum efficiency of 90% at full load and unity power
factor. Efficiency (in % ) at half load and 0.8 lagging power factor is
85.0-85.5
85.5-86.0
86.0-86.5
86.5-87.0
No, the answer is incorrect.
Score: 0
Accepted Answers:
85.0-85.5
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