## Guess Paper 1: Electric Machines Fall – 2020 Past Papers

Time Allowed: __3 hours__

Total Marks: __70, Passing Marks (35)__

Q.1 Define the following;

a) Gravitational Energy

b) Mechanical Energy

c) Electric Power

d) Resistance

e) Doping

f) Kinetic Energy

g) Ammeter

Q.2 What do you understand by torque and angular momentum for system of particles.Explain with an example.

Q. 3 Define Electric forces. If two charges of 30 micro-coulomb and 40 micro-coulomb are placed at a distance of 1 cm. Find the repulsive force between these charges.

Q. 4 Discuss the B-H loop and hysteresis in detail .

Q.5 What are semiconductors devices ? How a diode is biased? Explain both the forward and

reverse biasing.

Q.6 (a) Define work.

(b) A force of 10 N is applied on a mass of 100 Kg and displaces it at a distance of 5 meters in the direction of force making an angle of 30o. What amount of work has been done on the mass?

Q.7 Explain the Lenz’sLaw in detail.

Q.8 Write short note on any TWO of the following.

i. Mutual inductance

ii. Guass’s Law

iii. EM waves

## Guess Paper 2: Electric Machines Spring- 2020 Past Papers

Time Allowed: __3 hours__

Total Marks: __70, Passing Marks (35)__

Q.1 Define the following;

a) Periodic Motion

b) Hertz

c) Voltage

e) Biasing

f) Intrinsic

g) Dipole

Q.2 What do you understand by transverse and longitudinal waves? Explain with an example.

Q. 3 Define Electric Flux. If two charges of 20 micro-coulomb and 40 micro-coulomb are placed at a distance of 2 cm. Find the repulsive force between these charges.

Q. 4 Discuss the Lenz’s law and derive its equation.

Q.5 What is PN junction? How a diode is biased? Explain both the forward and reverse biasing.

Q.6 (a) Define work-energy theorem.

(b) A force of 10 N is applied on a mass of 10 Kg and displaces it at a distance of 20 meters in the direction of force making an angle of 30o. What amount of work has been done on the mass?

Q.7 Explain the Newton’s 2ndLaw of rotation in detail.

Q.8 Write short note on any TWO of the following.

i. Hook’s Law

ii. BiotSavert Law

iii. Youngs double slit experiment

**[OBJECTIVE]**

**Subject:** Physics-III (Electricity & Magnetism)

**Time Allowed: **10 Minutes

**Maximum Marks**: 10

**NOTE:** Attempt this Paper on this Question Sheet only. Please encircle the correct option. Division of marks is given in front of each question. This Paper will be collected back after expiry of time limit mentioned above.

__Part-I Encircle the right answer, cutting and overwriting is not allowed. (10)__

1. Electric field inside a uniform shell of charge is

(a) infinity (b) negative

(c) positive (d) zero

2. If both the plate area and the plate separation of a parallel-plate capacitor are doubled, the capacitance is

(a) unchanged (b) doubled

(c) halved (d) tripled

3. The statement that magnetic field lines form closed loops is a direct consequence of

(a) Gauss’ law for electricity (b) Gauss’ law for magnetism

(c) Faraday’s law (d} Ampere’s law

4. Applications of Gauss’ law are typically used to calculate

(a) charge (b) current

(c) potential (d)electric field

5. Lenz’s law deals with the

(a) Magnetic field of EMF (b) direction of EMF

(c) Both the direction and magnitude of EMF (d) direction of induced current

6. A current carrying loop lying in a magnetic field behaves like a

(a) magnetic dipole (b) magnetic pole

(c) magnetic material (d) non-magnetic material

7. Which of the following laws was modified by Maxwell? :

(a) Gauss’s law (b) Biot-Savart’s law

(c) Faraday’s law (d) Ampere’s law

8. Electromagnetic waves are produced by.

(a) an accelerating charge (b) a stationary charge

(c) charge less particles (d) a moving charge

9. Displacement current exists wherever there is

(a) a magnetic field (b) moving charge

(c) a changing magnetic field (d) a changing electric field

10. Mathematical expression for energy density uK is,

**[SUBJECTIVE]**

**Subject:** Physics-III (Electricity & Magnetism)

**Time Allowed: **2 Hours 45 Minutes

**Maximum Marks**: 50

**NOTE:** ATTEMPT THIS (SUBJECTIVE) ON THE SEPARATE ANSWER SHEET PROVIDED.

__Part-II Give short answers, each answer carries equal marks. (20)__

**Q#**1: What is meant by an electric field of continuous charge distribution?

**Q#**2: In the median plane of an electric dipole, is the electric field parallel or antiparallel to the electric dipole moment p?

**Q#**3: State Gauss law for electrostatics.

**Q#**4: Show that the capacitance with dielectric is given by C’ = K_{2}C

**Q#**5: What do you mean by motional EMF?

**Q#**6: State Faraday’s law for magnetism and write down its integral form.

**Q#**7: What is meant by the terms Bohr magneton and magnetization.

**Q#**8: Write down mathematical forms of any two Maxwell’s equations.

**Q#**9: How do you relate ¢, and 44, with velocity of electromagnetic waves in free space?

**Q#**10: Why a pn junction is sometimes called a nonlinear circuit element?

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