1. Using stress-strain diagrams, show the difference in deformation response between elastic and linear viscous (newtonian) materials. Label your diagrams

31. List three types of material objects that may be used to delineate strain in the geologic environment. What is the basic assumption in using deformed material objects to determine the amount of strain?

2. Discuss the effect temperature has on the rheology and style of deformation that rocks will experience.

With drawings, differentiate between the stress ellipse and the strain ellipse. How are the two interelated?

A 4-pole, separately excited, wave wound DC machine with negligible armature resistance is rated for 230 V and 5 kW at a speed of 1200 rpm. If the same armature coils are reconnected to forms a lap winding, what is the rated voltage (in volt s) and power (in kW) respectively at 1200 rpm of the reconnected machine if the field circuit is left unchanged ?

Question 3:

The synchronous generator supplying active power to an infinite bus via two short, lossless transmission lines, and is initially in steady state. The mechanical power input to the generator and the voltage magnitude E are constant. If one line is tripped at time t1by opening the circuit breakers at the two ends (although there is no fault), then it is seen that the generator undergoes a stable transient. Which one of the following waveforms of the rotor angle shows the transient correctly?

Question 4:

A separately excited DC generator has an armature resist ance of 0.1 and negligible armature inductance. At rated field current and rated rotor speed its open-circuit voltage is 200V. When this generator is operated at half the rated speed, with half the rated field current, an un-charged 1000F capacitor is suddenly connected across the armature terminals. Assume that the speed remains unchanged during the transient. At what time (in microsecond) after the capacitor is connected will the voltage across it reach 25V ?

Question 5:

The rotor of a three phase, 5 kW, 400 V, 50Hz, slip ring induction motor is wound for 6 poles while its startor is wound for 4 poles. The approximate average no load steady state speed when this motor is connected to 400 V, 50 Hz supply is?

Question 6:

If starting current of a 3 induction motor is 5 times the rated current, while rated slip is 4%, then ratio of starting torque to full-load torque is A 3-phase slip-ring induction motor is wound for 4 poles on startor and 6 poles on rotor. When 3- phase balanced voltage source at 50 Hz is applied to motor, it will run at?

Question 7:

A single phase 440 V, 60 Hz induction motor is to be operated at 25 Hz. Voltage that should be applied to the machine if air gap flux density is to be maintained at its normal value, is In a properly designed d.c generator of 10 kW capacity, total losses may be of the order of?

Question 8:

A 240 V, d.c shunt motor with an armature resistance of 05 has a full load current of 40 A. The ratio stalling torque to the full load torque when a resistance of 1 is connected in series with the armature, will be A D.C shunt motor is running at 1200 rpm, when excited with 220 V D.C. neglecting losses and saturation, speed of the motor when connected 175V D.C. supply will be?

Question 9:

A dc shunt motor having unsaturated magnetic circuit runs at 1000 rpm with rated voltage. If applied voltage is half of the rated voltage, then motor will run at A DC shunt motor is running at 1200 rpm, when excited with 220 V DC. Neglecting the losses and saturation, the speed of the motor when connected to a 175 V DC supply is?

Question 10:

A permanent magnet dc commutator motor has a no load speed of 6000 rpm when connected to a 120 V dc supply. The armature resistance is 2.5 ohms and other losses may be neglected. The speed of the motor with supply voltage of 60 V developing a torque 0.5 Nm, isA 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is?r

34. What is the difference between Mode I extension fractures and Mode I tension fractures?

Draw a diagram for each showing the fractures in relation to sigma 1 and sigma 3. Include the sign and orientation of the stress fields with respect to the mode I fractures.

35. Draw a diagram showing the relative orientation of sigma 1 and sigma 3 to a set of conjugate shear fractures. Show the angle at which the conjugate shears form, and place the sign (+ or -) on each showing the sense of shear