Q.56 The maximum efficiency occurs in a separately excited DC generator when the terminal voltage is 110 V and the induced emf is 120 V, the stray losses, if the armature resistance is 0.5 ohm, will be:Ans A. ...

Q.62 Three single-phase transformers, each with 50 kVA ratings are connected in delta. If one of the transformers is taken out of service, the capacity of the system will be:Ans A. 100 kVAB. 57.7 kVAC. 173.2 kVAD. 86.6 ...

Q.84 The word ‘diode’ is used to indicate that the device has _______.Ans A. two cathodesB. two electrodesC. two anodesD. two junctionsCorrect Ans Provided: B

Q.63 Compared to glass insulators the mechanical strength of porcelain insulators is ______.Ans A. very lowB. halfC. very highD. the sameCorrect Ans Provided: C

Q.71 The number system having the largest base is the ______ number system.Ans A. binaryB. decimalC. hexadecimalD. octalCorrect Ans Provided: C

Q.85 Which of the following defines the unit of electric power?Ans A. Volt-ampereB. Joule/meterC. Watt-secondD. Newton-meterCorrect Ans Provided: A

Q.9 What is the volt drop allowed for all brushes of each polarity for carbon or graphite brushes in the DC machine?Ans A. 3 VB. 2 VC. 4 VD. 1 VCorrect Ans Provided: B

Q.47 The product of normal system voltage and short circuit current of the fault is called ______.Ans A. open circuit KVAB. short circuit powerC. open circuit powerD. shot circuit KVACorrect Ans Provided: D

Q.73 In germanium diode, the ratio of reverse to forward resistance is _______.Ans A. 40000 : 1B. 400 : 1C. 400000 : 1D. 4000 : 1Correct Ans Provided: A

Q.61 A dielectric gas is also known as ______.Ans A. low resistivity gasB. insulating gasC. ionized gasD. charge gasCorrect Ans Provided: B