For a 1-ϕtransformer, open circuit test results are
(i) Voltage applied = 110 V
(ii) Current drawn = 0.6 A
(iii) Power consumed = 30 W
Power factor is _____________.
Question 2
Pyrometers are used of measuring very high temperatures. If ‘T’ is the absolute temperature of the hot body, the heat received by the detector of a pyrometer is proportional to:
Question 3
Effect of increment of temperature on diode parameters.
Question 4
A 3-phase moving coil type power factor meter has three fixed and symmetrically spaced current coils, inside of which are three other similarly placed moving potential coils. While in operation, rotating magnetic field is produced
Question 5
The ratio of (kVA)V-V to (kVA)Δ – Δ in transformer is
Question 6
An Op-Amp has a common mode gain of 0.01 and a differential mode gain of 105 . Its common mode rejection ratio would be:
Question 7
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I:
A. Improve power factor
B. Reduce the current ripples
C. Increase the power flow in line
D. Reduce the Ferranti effect
List-II:
1. Shunt reactor
2. Shunt capacitor
3. Series capacitor
4. Series reactor
The correct order of sequence of List-I (A B C D) is
Question 8
True RMS-reading voltmeter
1) Measures the RMS value of voltage accurately.
2) Eliminates the error due to waveform
3) Uses the thermocouple for heating.
Which of the above statements are correct?
Question 9
Minimum number of transmission lines are ________, if 150-bus system have YBus with 90% sparsity.
Question 10
Statement (I): Hysteresis and Eddy current losses cannot be obtained separately.
Statement (II):Core loss is addition of both hysteresis and eddy current losses.
