A diode will be farward biased when

• A) anode is connected to +ve and cathode to -ve terminal of a battery
• B) anode is connected to -ve and cathode to +ve terminal of a battery
• C) Both anode and cathode are connected to +ve terminal
• D) Both anode and cathode are connected to -ve terminal

There is no voltage drop across diode when farward biased, in case of

• A) practical diode model
• B) ideal diode model
• C)
• D)

Leakage current of semiconductor diode is caused by

• A) barrier voltage
• B) chemical energy
• C) heat energy
• D) doping impurity

When electrons leave the N- material to fill holes in the P-material , the process is called

• A) doping
• B) depletion
• C) diffusion
• D) mixing

which relation is true for transformer primary and secondary power

• A) V1V2=I1I2
• B) V2I1=V1I2
• C) V2I2=V1I1
• D) I2I1=V2V1

which rectifier is used to get either positive or negative part of input at output

• A) negative half wave rectifier
• B) half wave rectifier
• C) full wave rectifier
• D) bridge rectifier

A certain transformer has 500 turns in the primary winding and 2500 turns in the secondary winding.The turn ratio of transformer is

• A) 25:1
• B) 1:5
• C) 0.5
• D) 5:2

AC or dynamic resistance of diode is due to

• A) fixed value VD and ID of diode by applying DC voltage
• B) changing value VD and ID of diode by applying DC voltage
• C) changing value VD and ID of diode by applying varying input signal
• D) fixed resistance of diode by applying AC voltage

To which of the winding of transformer alternating voltage is applied

• A) primary winding
• B) secondary winding
• C)
• D)

For a P-N junction under farward bias

• A) more farward current flows
• B) more reverse current flows
• C) no farward current flows
• D) infinite reverse current flows

Depletion region of P-N junction is wider when it is

• A) Farward bias
• B) reverse bias
• C)
• D)

When the turn ratio of a transformer is 10 and primary ac voltage is 6v, the secondary voltage is

• A) 36v
• B) 6v
• C) 0.6v
• D) 60v

Semiconductors have ............... bonds

• A) mutual
• B) Ionic
• C) metallic
• D) covalent

Turn ratio of transformer is the

• A) ratio of number of turns in primary to secondary voltage
• B) ratio of number of turns in secondary to number of turns in primary
• C) ratio of number of turns in primary to number of turns in secondary
• D) ratio of number of turns in secondary to primary voltage

An ideal diode acts as a close switch when it is

• A) farward biased
• B) in saturation
• C) in cut off
• D) reverse biased

In semiconductor production, the process of intentional introduction of impurities into an intrinsic semiconductor for the purpose of improving its electrical, optical properties, is called

• A) Overlapping
• B) Mixing
• C) Modulating
• D) Doping

Thermal ionization in semicondutor results creating of

• A) only free electrons
• B) nothing
• C) only holes
• D) both free electrons and holes

An ideal diode acts as an open switch when it is

• A) farward biased
• B) reverse biased
• C)
• D)

Depletion region of P-N junction is narrow when it is

• A) Reverse bias
• B) Farward bias
• C)
• D)

A diode is a

• A) one way conductor
• B) three way conductor
• C) two way conductor
• D) insulator