Descriptive Type Paper II RBISB RO DEPR 2011 Question Paper

Reserve Bank of India
RBISB (RO DEPR)
Descriptive Type Paper II
2011 Question Paper

R. B. S. B. (R.O.—DEPR)

Panel Year 2011

PAPER II (DESCRIPTIVE TYPE)

[TIME : 09-30 A.M. TO 12-30 P.M.]

(Maximum Marks—100)

Instructions.—(1) Attempt any five questions.

(2) All questions carry equal marks.

(3) Credit will be given for orderly, effective and exact expression.

(4) Marks will not be alloted for superficial knowledge.

1. (a) Discuss in brief the objectives of India’s current foreign trade policy (2009-14).
(b) Discuss in brief the causes and consequences of recent world economic depression.

2. (a) The 2011 census has brought out the fact of rapid urbanization in India. Discuss the possible consequences.
(b) What has been the significance of the services sector as a driver for economic growth in India since 1990’s ?

3. Examine in detail the nature and causes of the recent inflation experience in India and suggest an appropriate policy response.

4. (a) What is the significance of agriculture to the Indian economy today ?
(b) Discuss the trade-off between environment and economic development in the light of India’s experience of economic development since 1990.

5. What according to you should be the major thrust of policy in order to achieve high economic growth along with significant employment generation ?

6. What are the arguments for and against full capital account convertibility for India ?

7. Outline the major reforms in the Indian financial sector since 1990.

8. (a) Discuss the following concepts in the context of poverty—
(i) Head count ratio
(ii) Poverty gap ratio
(b) Discuss the debate relating to measurement of poverty in India in recent years.

9. (a) Discuss the Basel III framework and challenges faced by Indian banks in this contex.
(b) Discuss the concept of Financial inclusion and its possible impact on economic development.

10. Write short notes on any four :—
(a) Declining sex-ratio at birth in India.
(b) The Harris-todoro model of migration.
(c) Financial repression.
(d) Labour market reforms in India.
(e) W. T. O. and developing countries.
(f) R. B. I’s response to recent inflation.

RBISB Manager Grade B Electrical Descriptive Type Paper II

Reserve Bank of India
RBISB (Manager Grade B Electrical)
Descriptive Type Paper II
2010 Question Paper

1. (a) An LC parallel circuit has an applied voltage  = 50 Cos (3000t+450) volts and
a total current iT = 2 cos (3000t – 450) amperes. It is also known that the current in the L branch is five times greater than the current in the C branch. Find L and C of this circuit.

(b) The Circuit constants R and L of a coil are to be determined by connecting the coil in series with a resistor of 25 and applying a 120 V, 60 Hz source and then reading the voltages across the resistor and the coil. Find R and L if VR  = 70. 8 Volts and VCoil = 86 Volts.

2. (a) Explain the principle of transformer action and derive an expression for the emf induced in a transformer winding. Show that the emf per turn in primary is equal to emf per turn in the secondary.
(b) Develop a phasor diagram of a single phase transformer under load for a lagging power factor.

3. (a) Find an expression for the magnetic force developed in a doubly excited translational magnetic system.
(b) Two air-cored coils have their magnetic axes coincident. Their parameters are :—
L1  =0.4 H L2 = 0.2H
M12 = M21 = 0.1e– 4x H, and where x is the distance between the two Coils.
For steady state current of I1 = 10A and I2 = 5A, calculate the magnetic force developed. Calculate the magnitude of force for x = 2.5 cm.

4. (a) Discuss the effect of pitch and distribution factors is an alternator.
(b) A 3-ph. Star connected alternator has a rating of 810 kVA at 2.5 kV and has 12 poles. Rated speed is 500 r.p.m. There are three slots per pole per phase and the number of conductors per slot are 5. For a full pitched winding, compute the flux per pole to give the rated terminal voltage at no load.

5. (a) What is the effect of excitation, speed and load on the losses of a d.c. machine ?
(b) A 230 V d.c. shunt motor is taking 5A when running at no load. The armature
resistance including brushes is 0.2 and field circuit resistance is 115 . For and input current of 72A, calculate the shaft output and efficiency. Also calculate the armature current at which the efficiency is maximum.

6. A 6 pole, 50 Hz, 3-phase induction motor has a rotor resistance of 0.2 per phase and a maximum torque of 160 Nm at 875 r.p.m. Calculate the following :—
(a) The torque for full load slip of 4%.
(b) The resistance to be added to the rotor to obtain 80% of full load torque at starting.

7. (a) A synchronous motor is operating at 0.6 pf lag at half-full load. With Ef , Vt,  Xs remaining constant, explain whether its power factor will be worsened or improved when it is made to operate at full load.
(b) A 433 – V, 3-phase, star-connected synchronous motor has a synchronous reactance of 5 per phase. For a power output of 15 kW, find its minimum armature current, excitation voltage and the power-angle. Armature resistance is negligible.

8. (a) Derive expressions for the inductance per phase of a 3 phase line with equilateral and unsymmetrical spacings, both, separately.
(b) The 3 conductors of a 3-phase line are arranged in a horizontal plane and are 4 meters apart. The diameter of each conductor is 2 cm. Calculate the capacitance between conductors.

9. (a) Discuss the advantages and disadvantages of transmitting large amounts of power over long distances using high voltage dc as compared to 3 phase ac transmission.
(b) What is the percentage saving in feeder conductor if the line voltage in a dc 2 wire system is raised from 220 volts to 500 volts for the same power to be transmitted.

10. Derive an expression for the resistance to be provided across circuit breaker contacts for critical damping when :—
(a) Circuit breaker is located at the sub-station and followed by a transmission line.
(b) The circuit breaker is located at the end of a long transmission line and with fault occuring on it.
————

Note:  = Pie Symbol

Reserve Bank of India Descriptive Type Paper II 2012 Question Paper

Reserve Bank of India
RBISB (Manager Grade B Electrical)
Descriptive Type Paper II
2012 Question Paper

R. B. S. B. (MANAGER — Grade ‘ B ’ — ELECTRICAL) 2012
PAPER II—(DESCRIPTIVE TYPE)
[Time : 2-30 P.M. to 5-30 P.M.]
(Maximum Marks—100)
AFTERNOON
TEST CODE : O

Instructions:-

(1) Attempt any five questions. All questions carry equal marks. 

(2) Answers must be written in English or Hindi. However all the answers should be in one language only. 

(3) Parts of the same question, if any, must be answered together without answers to other questions intervening. 

(4) Each question must be started on fresh page. 

(5) Marks will be deducted if handwriting is not easily legible. 

(6) Answers will be evaluated on the basis of logic, brevity and clarity in exposition. 

(7) Use of ordinary calculators with six functions and twelve digits / log tables is permitted. 

1. A series R-L circuit with R = 50 and L = 10 H has a constant voltage V= 100 Volts applied at t=0 by closing a switch. Find—

(a) equation for i,VR and VL

(b) current at t = 0.5 sec

(c) time at which VR  = VL

2. A 25kVA transformer supplies a load of 12 kW at power factor of 0.6 lagging. Find the % of full load, the transformer is carrying. If additional unity power factor loads are to be served with the same transformer, how many kW may be added before the transformer is at full load ?

3. (a) Define infinite bus-bar. Discuss the effect of variation of excitation of a synchronous machine connected to such a system.

(b) Discuss the division of load ( active and reactive components) between two alternators when they are running in parallel ?

4. A 5000 kVA, 10000 V, 1500 rpm, 50Hz alternator runs on parallel with other machine, its synchronous reactance is 0.20 per unit. Find for no load and full load at 0.8 pf lagging, the synchronizing power per unit mechanical angle of phase displacement and calculate the synchronizing torque if the mechanical displacement is 0.5 ?

5. (a) A single phase overhead line consist of a pair of conductors 10 mm in  diameter spaced uniformly 2 meters apart in air. Find the capacitance per km.

(b) If the line is 30 km long and its one end is connected to 50 kV, 50Hz system, what is the charging current with the other end open circuited ?

6. (a) What is meant by capacitance grading of cable ?

(b) Write a short note on pressure cable.

(c) What is the purpose of inter-sheath in cable ?

7. A 3-wire DC system with 400 V between outers supplies lighting loads of 1200 amp and 1040 amp on the positive and negative side and the motor load of 400 kW across the outers. Calculate the load on the main generators and on each of the balancer machines assuming that at this load each balancer machine has a loss of 6 kW ?

8. (a) Discuss the methods of improving the state stability and transient stability of a system.

(b) A power system has a maximum steady state stability limit equal to 100 MW. If it is supplying a load of 50 MW, what is the sudden increase in load permissible if the transient stability of the system is to be maintained ?

9. Assume that a generator with constant internal voltage is subjected to different types of faults and that all the resistances are negligible. Also, assume that the absolute values of fault currents for the different types of faults are as follows :-

(a) 3 (Pie Symbol here), 1000 amp

(b) line to line, 1400 amp

(c) line to ground, 2220 amps.

If the positive sequence voltage to neutral is 2000 volts, what are the positive, negative and zero sequence impedances ?

10. 10 Electrical power is to be supplied to a 3- , 25 Hz system from a 3- , 50 Hz system through a motor-generator set consisting of two directly coupled synchronous machines.

(a) What is the minimum number of poles which the motor may have ?

(b) What is the minimum number of poles which the generator may have ?

(c) At what speed in rpm will the set specified in (a) and (b) operate ?

Note:  = Pie Symbol