# JNTU Kakinada B-Tech 2-1 R1621025 THERMAL AND HYDRO PRIME MOVERS R16 May 2018 Question Paper

Code No: R1621025
II B. Tech I Semester Supplementary Examinations, May – 2018
THERMAL AND HYDRO PRIME MOVERS (Electrical and Electronics Engineering)Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answer ALL the question in Part-A
3. Answer any Four Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1. a)Explain the importance of cooling and lubrication in IC engine.
c)Discuss about regeneration system used in gas turbine plant.
d)Differentiate between reciprocating and centrifugal pumps.
e)What is governing? Why it is required for hydraulic turbines?
PART -B
2. a)Explain in detail the valve timing diagram of four stroke SI engine.
b) What is the necessity of a carburetor in a petrol engine? With a neat sketch explain the
working of a simple carburetor and write its limitations.

3. a)Explain the working of steam power plant with reheating system.
b) The nozzles of a Delaval steam turbine are supplied with dry saturated steam at a
pressure of 9 bar. The pressure at the outlet is 1 bar. The turbine has two nozzles with
a throat diameter of 2.5 mm. Assuming nozzle efficiency as 90% and that of turbine
rotor 35%, find the quality of steam used per hour and the power developed.

4. a)With a neat sketch explain the working of closed cycle gas turbine plant.
b) The air enters the compressor of an open cycle constant pressure gas turbine at a
pressure of 1 bar and temperature of 20?C. The pressure of the air after compression is
4 bar. The isentropic efficiencies of compressor and turbine are 80% and 85%
respectively. The air-fuel ratio used is 90 : 1. If flow rate of air is 3.0 kg/s, find :(i)Power developed.(ii) Thermal efficiency of the cycle.Assume C
P
= 1.0 kJ/kg K and ?
= 1.4 for air and gases.Calorific value of fuel = 41800 kJ/kg.

5. a) A jet of water of 75 mm diameter strikes a curved vane at its center with a velocity of
20 m/s. The curved vane is moving with a velocity of 8 m/s in the direction of jet.Find
the force exerted on the plate in the direction of the jet, power and efficiency of the
jet. Assume the plate to be smooth.
b) Explain the working of a centrifugal pump with a neat diagram showing all the
components.
1 of 2
SET – 1
R16

Code No: R1621025
II B. Tech I Semester Supplementary Examinations, May – 2018
THERMAL AND HYDRO PRIME MOVERS (Electrical and Electronics Engineering)Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answer ALL the question in Part-A
3. Answer any Four Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1. a)Explain the importance of cooling and lubrication in IC engine.
c)Discuss about regeneration system used in gas turbine plant.
d)Differentiate between reciprocating and centrifugal pumps.
e)What is governing? Why it is required for hydraulic turbines?
PART -B
2. a)Explain in detail the valve timing diagram of four stroke SI engine.
b) What is the necessity of a carburetor in a petrol engine? With a neat sketch explain the
working of a simple carburetor and write its limitations.

3. a)Explain the working of steam power plant with reheating system.
b) The nozzles of a Delaval steam turbine are supplied with dry saturated steam at a
pressure of 9 bar. The pressure at the outlet is 1 bar. The turbine has two nozzles with
a throat diameter of 2.5 mm. Assuming nozzle efficiency as 90% and that of turbine
rotor 35%, find the quality of steam used per hour and the power developed.

4. a)With a neat sketch explain the working of closed cycle gas turbine plant.
b) The air enters the compressor of an open cycle constant pressure gas turbine at a
pressure of 1 bar and temperature of 20?C. The pressure of the air after compression is
4 bar. The isentropic efficiencies of compressor and turbine are 80% and 85%
respectively. The air-fuel ratio used is 90 : 1. If flow rate of air is 3.0 kg/s, find :(i)Power developed.(ii) Thermal efficiency of the cycle.Assume C
P
= 1.0 kJ/kg K and ?
= 1.4 for air and gases.Calorific value of fuel = 41800 kJ/kg.

5. a) A jet of water of 75 mm diameter strikes a curved vane at its center with a velocity of
20 m/s. The curved vane is moving with a velocity of 8 m/s in the direction of jet.Find
the force exerted on the plate in the direction of the jet, power and efficiency of the
jet. Assume the plate to be smooth.
b) Explain the working of a centrifugal pump with a neat diagram showing all the
components.
1 of 2
SET – 1
R16

Code No: R1621025

6. a)Explain the construction and working of Pelton wheel.
b) A Pelton wheel is to be designed for the following specifications:
Shaft Power of the wheel = 115 kW, Head = 72 meters, speed = 240 rpm, overall
efficiency = 85%, Determine the following: i) The wheel diameter, ii) Diameter of
the jet, iii) size of the bucket, iv) number of buckets on the wheel. Take C
V
= 0.98,
speed ratio = 0.45.

7. a) Draw the general layout of a hydro electric power plant and explain its construction
and working.
b) The annual peak load of 30 MW power plant is 25 MW. The loads having maximum
demands of 10 MW, 8.5 MW, 5 MW and 4.5 MW are connected to the power plant.
The annual load factor is 45%. Find i) Average load on the power plant, ii) Energy
supplied per year, iii) Demand factor, iv) Diversity factor.

2 of 2
SET – 1
R16

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