Electrical Engineering Mcqs

A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?

• (A)  0.01 s
• (B)  0.1 s
• (C)  0.5 s
• (D)  5 s

Answer

Submitted By :Ali Uppal

A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is_____________?

• (A)  50 ohms
• (B)  500 ohms
• (C)  1000 ohms
• (D)  5000 ohms

Answer

Submitted By :Ali Uppal

A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?

• (A)  50 N
• (B)  120 N
• (C)  240 N
• (D)  480 N

Answer

Submitted By :Ali Uppal

A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?

• (A)  10 V
• (B)  15 V
• (C)  25V
• (D)  50V

Answer

Submitted By :Ali Uppal

Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?

• (A)  6 H
• (B)  8 H
• (C)  12 H
• (D)  24 H

Answer

Submitted By :Ali Uppal

Lenz’s law is a consequence of the law of conservation of__________?

• (A)  induced current
• (B)  charge
• (C)  energy
• (D)  induced
• (E)  m.f.

Answer

Submitted By :Ali Uppal

In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?

• (A)  2.0
• (B)  1.0
• (C)  0.5
• (D)  zero

Answer

Submitted By :Ali Uppal

A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?

• (A)  6 mH
• (B)  14 mH
• (C)  24 mH
• (D)  48 mH

Answer

Submitted By :Ali Uppal

The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?

• (A)  4 mH
• (B)  5 mH
• (C)  6 mH
• (D)  12 mH

Answer

Submitted By :Ali Uppal

Which circuit element(s) will oppose the change in circuit current ?

• (A)  Resistance only
• (B)  Inductance only
• (C)  Capacitance only
• (D)  Inductance and capacitance

Answer

Submitted By :Ali Uppal