Electrical Engineering Mcqs

There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is______________?

• (A)  490 mA
• (B)  800 mA
• (C)  310 mA
• (D)  0 A

Answer

Submitted By :Ali Uppal

The signal generator generally used in the laboratories is___________oscillator?

• (A)  Wien-bridge
• (B)  Hartely
• (C)  Crystal
• (D)  Phase shift

Answer

Submitted By :Ali Uppal

If one of the resistors in a parallel circuit is removed, the total resistance_____________?

• (A)  decreases
• (B)  increases
• (C)  remains the same
• (D)  doubles

Answer

Submitted By :Ali Uppal

The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is____________?

• (A)  200 mA
• (B)  540 mA
• (C)  1.24 A
• (D)  900 mA

Answer

Submitted By :Ali Uppal

In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is __________?

• (A)  Increased 2 times
• (B)  Decreased 4 times
• (C)  Increased 4 times
• (D)  Decreased 2 times

Answer

Submitted By :Ali Uppal

Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is______________?

• (A)  60 mA
• (B)  15 mA
• (C)  135 mA
• (D)  31.25 mA

Answer

Submitted By :Ali Uppal

In a certain oscillator Av = 50. The attention of the feedback circuit must be___________?

• (A)  1
• (B)  01
• (C)  10
• (D)  02

Answer

Submitted By :Ali Uppal

____________is a fixed frequency oscillator?

• (A)  Phase-shift oscillator
• (B)  Hartely-oscillator
• (C)  Colpitt’s oscillator
• (D)  Crystal oscillator

Answer

Submitted By :Ali Uppal

An important limitation of a crystal oscillator is____________?

• (A)  Its low output
• (B)  Its high Q
• (C)  Less availability of quartz crystal
• (D)  Its high output

Answer

Submitted By :Ali Uppal

The value of negative feedback fraction is always _______________?

• (A)  Less than 1
• (B)  More than 1
• (C)  Equal to 1
• (D)  None of the above

Answer

Submitted By :Ali Uppal