Q.17 Critical speed of a shunt generator is the speed for which:Ans A. the given armature resistance represents the critical resistanceB. the given shunt field resistance represents the load resistanceC. the given shunt field resistance represents the critical ...
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Q.20 IGBT is a ______ terminal device and ______ layer device.Ans A. 4, 3B. 3, 3C. 3, 4D. 4, 4Correct Ans Provided: C
Q.43 The generation and transmission of electrical power are more efficient in three-phase systems employing three voltages of:Ans A. different magnitude and frequency and 120° phase difference from each otherB. the same magnitude and frequency and 120° phase ...
Q.15 A vector field A is said to be solenoidal or divergence-less if ∇∙A is equal to:Ans A. −1B. 1C. 0D. InfinityCorrect Ans Provided: C
Q.44 Which of the following conditions is correct for a system to be stable?Ans A. No poles in the left half of s-planeB. No poles in the right half of s-planeC. No zeros in the right half of ...
Q.14 If a shunt generator is excited in open circuit condition, its shunt field resistance should be:Ans A. less than the critical resistanceB. twice the critical resistanceC. equal to the critical resistanceD. slightly more than the critical resistanceCorrect ...
Q.61 What will be the VA output of a CT having a ratio of 100 : 5 and secondary resistance of 0.1 Ω? The resistance of the connecting lead is given as 0.1 Ω and the relay burden ...
Q.57 Which of the following orders is true with respect to the maximum switching frequency of the given power semiconductor devices?Ans A. MOSFET > IGBT > BJTB. IGBT > MOSFET > BJTC. BJT > IGBT > MOSFETD. IGBT ...
Q.38 The output of an AC filter is said to be down 3 dB or –3 dB at the cutoff frequencies. Actually at this frequency, the output voltage of the circuit is:Ans A. 70.7% of the maximum input ...
Q.55 Which of the following properties is NOT true for ferromagnetic materials?Ans A. They retain a considerable amount of their magnetisation when removed from the field.B. They are capable of being magnetised very strongly by a magnetic field.C. ...
