Electrical Engineering Mcqs

A half-wave rectifier has an input voltage of 240 V r.m.s. If the step-down transformer has a turns ratio of 8:1, what is the peak load voltage? Ignore diode drop?

• (A)  27.5 V
• (B)  86.5 V
• (C)  30 V
• (D)  42.5 V

Answer

Submitted By :Ali Uppal

IC = ß IB +__________?

• (A)  ICBO
• (B)  IC
• (C)  ICEO
• (D)  aIE

Answer

Submitted By :Ali Uppal

_____________ filter circuit results in the best voltage regulation?

• (A)  choke input
• (B)  capacitor input
• (C)  resistance input
• (D)  none of the above

Answer

Submitted By :Ali Uppal

The output impedance of a transistor connected in_____________arrangement is the highest?

• (A)  common emitter
• (B)  common collector
• (C)  common base
• (D)  none of the above

Answer

Submitted By :Ali Uppal

A 1,000 V power supply would use_____________ as a filter capacitor?

• (A)  paper capacitor
• (B)  air capacitor
• (C)  mica capacitor
• (D)  electrolytic capacitor

Answer

Submitted By :Ali Uppal

IC = aIE +____________?

• (A)  IB
• (B)  ICEO
• (C)  ICBO
• (D)  ßIB

Answer

Submitted By :Ali Uppal

A zener diode utilizes ______________ characteristics for its operation?

• (A)  forward
• (B)  reverse
• (C)  both forward and reverse
• (D)  none of the above

Answer

Submitted By :Ali Uppal

If the a.c. input to a half-wave rectifier is an r.m.s value of 400/√2 volts, then diode PIV rating is__________________?

• (A)  400/√2 V
• (B)  400 V
• (C)  400 x √2 V
• (D)  none of the above

Answer

Submitted By :Ali Uppal

There is a need of transformer for__________________?

• (A)  half-wave rectifier
• (B)  centre-tap full-wave rectifier
• (C)  bridge full-wave rectifier
• (D)  none of the above

Answer

Submitted By :Ali Uppal

The disadvantage of a half-wave rectifier is that the__________________?

• (A)  components are expensive
• (B)  diodes must have a higher power rating
• (C)  output is difficult to filter
• (D)  none of the above

Answer

Submitted By :Ali Uppal