Q.70 Which of the following circuit is used to obtain pulse gate triggering?Ans 1. Resistance-capacitance triggering circuit2. UJT based relaxation oscillator circuit3. Diac-Triac circuit4. Resistive triggering circuitCorrect Ans Provided: 2
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Q.61 For a 3-phase semiconverter, if the firing angle for thyristor is 90°, the free-wheeling diode will conduct for a period of _____________.Ans 1. 0°2. 90°3. 30°4. 120°Correct Ans Provided: 3
Q.75 The critical point (-1, j0) is mapped to ________ on the Nichols chart.Ans 1. (1 dB, 0°)2. (0 dB, – 180°)3. (0 dB, 0°)4. (1 dB, 180°)Correct Ans Provided: 2
Q.69 A 3-phase 4 pole induction motor is supplied from a 50 Hz source. Find the rotor frequency when the rotor runs at 600 rpm.Ans 1. 25 Hz2. 50 Hz3. 30 Hz4. 20 HzCorrect Ans Provided: 3
Q.66 With reference to fault analysis, L-L fault is ____________ fault and the L-L-L-G fault is _________ fault.Ans 1. Symmetrical, Unsymmetrical2. Unsymmetrical, Unsymmetrical3. Unsymmetrical, Symmetrical4. Symmetrical, SymmetricalCorrect Ans Provided: 3
Q.84 An alternator has a per unit impedance of 0.9 p.u. to a base of 20 MVA, 33 kV, Then the p.u. impedance to the base of 60 MVA and 11 kV will be _____________.Ans 1. 24.32. 32.43. ...
Q.46 Which of the following statement is WRONG when underground cables are compared with overhead lines?Ans 1. The conductor in overhead lines are less expensive2. Underground cables give greater safety to the public3. For long distance transmission, overhead ...
Q.42Ans 1.2.3.4.Correct Ans Provided: 4
Q.44 Amplitude of antisymmetric signal is ____________ at the origin.Ans 1. Always positive2. Always negative3. Always zero4. Either positive or negative but not zeroCorrect Ans Provided: 3
Q.49 Which of the following condition must be satisfied to measure the power delivered to a 3-phase load, using only 2 wattmeters?Ans 1. Load must be unbalanced2. Load must be balanced3. Load must be connected to the source ...
