Electrical Engineering Mcqs

The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?

• (A)  3-Jan
• (B)  3
• (C)  1
• (D)  6

Answer

Submitted By :Ali Uppal

Magnetic compass needle will be deflecting if it is kept near________________?

• (A)  Static charge
• (B)  Soft iron
• (C)  Semi-conductor
• (D)  Accelerating charge

Answer

Submitted By :Ali Uppal

A.C can not be used for_______________?

• (A)  producing heat
• (B)  producing light
• (C)  Magnetizing iron
• (D)  Producing magnetic field

Answer

Submitted By :Ali Uppal

A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?

• (A)  A torque about horizontal axis
• (B)  A torque about vertical axis
• (C)  An upward force along the axis
• (D)  No resultant force

Answer

Submitted By :Ali Uppal

The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to_____________?

• (A)  Magnetic flux density
• (B)  Torque
• (C)  Mutual induction
• (D)  Motional emf

Answer

Submitted By :Ali Uppal

The emf induced in a coil by a changing magnetic flux may have unit as______________?

• (A)  ms-1A
• (B)  ms-2A-1
• (C)  kgms2A-1
• (D)  kgm2s-1A-1

Answer

Submitted By :Ali Uppal

Power loss in actual transformer is due to_________________?

• (A)  Small output
• (B)  Eddy currents and magnetic hysterias
• (C)  Soft iron core
• (D)  Back emf

Answer

Submitted By :Ali Uppal

A.C and D.C have the same______________?

• (A)  effect in charging a capacitor
• (B)  effect in charging a battery
• (C)  effect while passing through an inductance
• (D)  heating effect through a resistance

Answer

Submitted By :Ali Uppal

If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?

• (A)  Vs/Vp = Np/Ns
• (B)  Vs/Vp = Ns/Np
• (C)  Vp/Vs = Ns/Np
• (D)  Vp/Vs = Np/Ns

Answer

Submitted By :Ali Uppal

A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?

• (A)  0 volt
• (B)  3.125 volt
• (C)  31.25 volt
• (D)  0.03125 volt

Answer

Submitted By :Ali Uppal