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Here we provide practice questions in form MCQ of all different subjects of electical engg.
1. Which of the following matching is incorrect:a)Ampere’s circuital law → ∇× H = J + ∂D / ∂tb) Displacement current density → J = ∂D / ∂ tc) Poisson’s equation → ∇ 2V = 0d) Continuity equation → ∇ ⋅ J = − ∂ρ/ ∂ t Ans: c 2.A loop is rotating about y-axis … Read more
1. If residual magnetism of a shunt generator is destroyed accidentally, it may be restored by connecting its shunt field (a) To earth(b) to an alternator(c) in reverse(d) to a battery Ans: d2.The sole purpose of commutator in a dc generator is to (a) Increase output voltage(b) reduce sparking at brushes(c) provide smoother output(d) convert the induced … Read more
1. The no-load current drawn by the transformer is usually what percent of the full-load current?(a) 0.2 to 0.5 percent(b) 2 to 5 percent(c) 12 to 15 percent(d) 20 to 30 percent Ans: b2. Sumpner’s test is conducted on transformers to determine(a) temperature(b) stray losses(c) all-day efficiency(d) none of the above Ans: a 3.In a … Read more
1. A thermal protection switch provides protection against what? (a)a. Overloadb. Temperaturec. Short circuitd. Overvoltage Ans: a 2. What is/are the main disadvantage of using oil as the quenchingmedium in the circuit breakers? a. Need periodical replacement.b. Risk of formation of an explosive mixture with air.c. Possibility of causing fire hazards.d. All of the above. Ans: … Read more
31.What will happen if a voltmeter is connected like an ammeter in series of the load?(a) The meter will burn out.(b) The measurement will be too high.(c) The same current will flow as would have been with an ammeter in circuit.(d) There will be almost no current in the circuit Ans: d 32. The pressure … Read more
1. Hot wire ammeters are used for measuring:(a) Only a.c.(b) Only d.c(c) Neither a.c nor d.c(d) Both a.c. and d.c. Ans: d 2. Rectifier type instrument can be used in-(a) a.c.(b) d.c.(c) Both (a) and (d)(d) Pulsating Ans: a 3.An electrodynamometer type of instruments finds its major use as(a) Standard instrument only(b) Transfer instrument only(c) … Read more
1. The unit of solid angle isa)Solid Angleb)Radianc)Steradiand)Candela Ans: c2. Candela is the unit ofa)Luminous fluxb)Luminous intensityc)Wavelengthd)None of the above Ans: b 3. The practical luminous efficiency of the sodium vapour lamp is of the order ofa) 25 to 40 lumens per wattb) 40 to 45 lumens per wattc) 45 to 50 lumens per wattd) … Read more
1. In electrical resistance welding, material of electrode should havea)higher electrical conductivitiesb) higher thermal conductivitiesc) sufficient strength to sustain high pressure at elevated temperaturesd) all of the above Ans: d 2. Induction heating takes place ina)conducting and magnetic materialsb)insulating materialsc)conducting materials which may be either magnetic or non-magentic materialsd) conducting but non-magnetic materials Ans: c … Read more
1. When a high voltage overhead line passes over or adjacent to any buildingthe vertical clearance between the highest part of the building immediatelyunder such liner, recommended in IE rules is of not less thana) 1.2mb) 2.8mc) 6md) 3.7m Ans: d 2. What is the minimum clearance of HV lines from the ground across streets?a) … Read more