PHY301 Final Term Complete Solved Paper by Waseem

FINALTERM EXAMINATION

Fall 2009

PHY301- Circuit Theory (Session - 2) Time: 120 min Marks: 70

Q1. Charge of 2c and 5c will (1 marks)

1. attract each other
2. repel each other
3. no effect
4. cancel each other

Correct answer: repel each other

Q2. Which battery applies a greater potential difference? (1 marks)

1. 12v
2. 1.5v
3. 10v
4. 0.5v

Correct answer: 12v

Q3. When one resistance in a series string is open (1 marks)

1. The current is maximum in the normal resistances.
2. The current is zero in all resistances
3. The voltage is zero across the open resistance
4. The current increases in voltage source

Correct answer: The current is zero in all resistances

Q4. Addition of impurities in semiconductor material to produce more current is called (1 marks)

1. dopping
2. bonding
3. excitation
4. intrinsic

Correct answer: dopping

Q5. For a P-N junction under farward bias (1 marks)

1. more farward current flows
2. no farward current flows
3. more reverse current flows
4. infinite reverse current flows

Correct answer: more farward current flows

Q6. A diode is a (1 marks)

1. one way conductor
2. two way conductor
3. three way conductor
4. insulator

Correct answer: one way conductor

Q7. In farward biased Characteristics of junction diode, current value is (1 marks)

1. i=ISe^V/V
2. Is=ie^V/VT
3. i=Ise^VT/V
4. i=Ise^V/VT

Correct answer: Is=ie^V/VT

Q8. The primary and secondary winding of transformer are (1 marks)

1. physically touched
2. physically isolated
3. touched with conductor
4. largely separated

Correct answer: physically isolated

Q9. A certain transformer has 500 turns in the primary winding and 2500 turns in the secondary winding. The turn ratio is (1 marks)

1. 0.5
2. 25
3. 25v
4. 2500

Correct answer: 25

Q10. A transformer will be out of phase when (1 marks)

1. output voltage is 0 degree out of phase with input voltage
2. output voltage is 180 degree out of phase with input voltage
3. output voltage is 360 degree out of phase with input voltage
4. output voltage is same as input voltage

Correct answer: output voltage is 180 degree out of phase with input voltage

Q11. If N denotes the total number of nodes, then number of nodal equations in nodal analysis will be (1 marks)

1. Number of equations=N-1
2. Number of equations=N-1/2
3. Number of equations=N
4. Number of equations=N-2

Correct answer: Number of equations=N-1

Q12. Using superposition theorem, for a circuit containing independent sources, any remaining current source is (1 marks)

1. replaced by capacitor
2. replaced by short circuit
3. made zero by replacing them by open circuit
4. replaced by close circuit

Correct answer: made zero by replacing them by open circuit