Question

Roll No :
Name:
1. Which of the following cannot determined by the no load test?
(a) Winding resistance and reactance, (b) shunt branch parameter, (c) no load p.f.(d) no load loss
2. Determine the rms value of the current wave form represented by
i(t) = 10 + 100sinwt+20 cos(3wt+n/6)+ 10cos(5wt +27/13)
3. The output of a transformer at full load and unity p.f. is 400kW. What is the output at 0.8p.f and
half load?
(a) 200W , (b) 320W, (c) 160W, (d) none of these
4. If the core loss and copper loss of transformer are 4W each. The efficiency of transformer
(a)100%, (b) 97.57%, (c) 96.97%, (d) 95.24%
5. In a 3 phase induction motor, the rotor field rotates at synchronous speed with respect to
(A) Stator,(B)rotor,(C) stator flux ,(D) none of the above
6. A zero watt lamp consumes
(A) no power, (B) about 5 to 7 W power, (C) about 15 to W power ,(D) about 25 to 30 W power.
7. If R=XFX=10ohm and the applied voltage is equal to the current flowing in the circuit is
8. When a resistance is connected across an AC voltage source, the frequency of the power wave is
(a)equal to frequency of voltage wave, (b) equal to frequency of current wave,(c) twice that of
voltage and current wave,(d) none of these
9. A 415 V star connected system is connected to delta connected balanced load of 83 ohm. The line
current is 1 (a) 5A, (b)0A, (c)8.66A, (d) 10A.
10.In the two wattmeter method of measuring power in a three phase circuit, the two wattmeter will
show equal reading when the power factor angle 0 is equal to
(a) 90degree, (b) 60 degree , (c) 30 degree, (d) 0 degree​

Answer 1

Answer:

1 Ka winding resistance and rectance

Answer 2

Answer:

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