# Recent questions and answers in Electrical Engineering

Equivalent π model is quite suitable for analyzing the performance of transmission line of  A) 50 km length B) 150 km length C) 250 km length D) All of the above lengths
Last Answer : 150km because nominal π and T method are used in medium transmission lines . and these lines ranges from 80-240 km...

If a 220 V heater is used on 110 V supply, the heat produced by it will be nearly (a) one half (b) twice (c) one-fourth (d) four times

Varley loop tests are preferred over Murray loop tests because  (1) Valley loop test can locate open circuit fault (2) Varley loop test gives higher accuracy (3) in Varley loop test provision is made for ... of obtaining it from the relation R = pl/a (4) Valley loop test can locate the earth fault

A 1mA D' Arsonval movement has resistance of 100 Ω. It is to be converted to a 10 V voltmeter. The value of multiplier resistance is  (A) 999 Ω (B) 9999 Ω (C) 9900 Ω (D) 990 Ω
Last Answer : C) Rs = (10/1x10^-3) - 100 Rs = 9900...

Minimum distance of underground cable from the foundation of building should be   (a) 100 cm (b) 50 cm (c) 10 cm (d) 5 cm

Define reluctance and give its unit.
Last Answer : Reluctance is the resistance offered the material to the passage of magnetic flux through it and corresponds to resistance in the electric circuit it is denoted by (s) And it's unit is amper per weber (A/Wb)...

In a CRO, the quantity to be measured is applied across  (1) focusing electrodes (2) cathode (3) Y-plates (4) X-plates

A. active power B. reactive power C. apparent power D. A & C E. B & C

CRO is used to measure ________. A. Amplitude B. Phase difference C. Frequency D. All of these

Short-circuit kVA is obtained by multiplying the base kVA by (1) 10% X (2) 20% X (3) 50% X (4) 100% X

Consider the following statements : If a high Q parallel resonant circuit is loaded with a resistance  1. The circuit impedance reduces.  2. The resonant frequency remains the same.  3. The bandwidth reduces.  Which of the above statements is/are correct ?

The voltage of a circuit is measured by a voltmeter having input impedance comparable with the output impedance of the circuit thereby causing error in voltage measurement. This error may be called as_________.
Last Answer : error caused by misuse of instrument...

Define Electrolyte. Write its types.
Last Answer : A substance that dissociates into ions in solution and acquires the capacity to conduct electricity. Sodium, potassium, chloride, calcium, and phosphate are examples of electrolytes, informally known as lytes....

Arc welding uses following electric supply (A) ac (B) dc (C) both ac and dc (D) spiral waveform
Last Answer : both ac and dc...

Which of the following is true with an auto transformer? A) It has only one winding  B) It has two separate windings namely primary winding and secondary winding C) It has two primary windings and one single secondary winding D) None of these
Last Answer : A it has only one winding....