Electrical Engineering Mcqs

Bulbs in street lighting are all connected in_____________?

• (A)  parallel
• (B)  series
• (C)  series-parallel
• (D)  end-to-end

Answer

Submitted By :Ali Uppal

In the case of direct current____________?

• (A)  magnitude and direction of current remains constant
• (B)  magnitude and direction of current changes with time
• (C)  magnitude of current changes with time
• (D)  magnitude of current remains constant

Answer

Submitted By :Ali Uppal

Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?

• (A)  100 W lamp will glow brighter
• (B)  40 W lamp will glow brighter
• (C)  Both lamps will glow equally bright
• (D)  40 W lamp will fuse

Answer

Submitted By :Ali Uppal

When current flows through heater coil it glows but supply wiring does not glow because______________?

• (A)  current through supply line flows at slower speed
• (B)  supply wiring is covered with insulation layer
• (C)  resistance of heater coil is more than the supply wires
• (D)  supply wires are made of superior material

Answer

Submitted By :Ali Uppal

Temperature co-efficient of resistance is expressed in terms of___________?

• (A)  ohms/°C
• (B)  mhos/ohm°C
• (C)  ohms/ohm°C
• (D)  mhos/°C

Answer

Submitted By :Ali Uppal

A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?

• (A)  80 m
• (B)  60 m
• (C)  40 m
• (D)  20 m

Answer

Submitted By :Ali Uppal

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?

• (A)  160 ohms
• (B)  80 ohms
• (C)  20 ohms
• (D)  10 ohms

Answer

Submitted By :Ali Uppal

Which method can be used for absolute measurement of resistances _______________?

• (A)  Lorentz method
• (B)  Releigh method
• (C)  Ohm’s law method
• (D)  Wheatstone bridge method

Answer

Submitted By :Ali Uppal

Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?

• (A)  3/2 Q
• (B)  6 Q
• (C)  4 Q
• (D)  8/3 Q

Answer

Submitted By :Ali Uppal

Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?

• (A)  9 times
• (B)  1/9 times
• (C)  1/3 times
• (D)  3 times

Answer

Submitted By :Ali Uppal