2670 + Mcqs in NTPC (Technical Ability) Page 6 McqOptions

251.	Newton's law of viscosity depends upon the:
A.	Stress and strain in a fluid
B.	Shear stress, pressure and velocity
C.	Shear stress and rate of strain
D.	Viscosity and shear stress
Answer» D. Viscosity and shear stress

Discussion

252.	Consider the following mechanisms: 1. Geneva gearing 2. Rack and pinion 3. Ratchet and pawl Which of these mechanisms are used to index the work table or a transfer machine?
A.	1 and 2
B.	2 and 3
C.	1 and 3
D.	1, 2 and 3
Answer» E.

Discussion

253.	Consider the following features: 1. All spindles operate simultaneously 2. One piece is complete each time the tools are withdrawn and the spindles are indexed 3. The tool slide indexes or revolves with the spindle carrier. Which of these features are characteristics of a multi-spindle automatic machine used for bar work?
A.	1, 2 and 3
B.	1 and 2
C.	2 and 3
D.	1 and 3
Answer» B. 1 and 2

Discussion

254.	Machining centre is:
A.	An automatic tool changing unit
B.	A group of automatic machine tools
C.	A next logical step beyond NC machine
D.	AN NC machine tool
Answer» C. A next logical step beyond NC machine

Discussion

255.	Stability of a freely floating object is assured if its centre of:
A.	Buoyancy lies below its Centre of gravity
B.	Gravity coincides with its Centre of buoyancy
C.	Gravity lies below its metacenter
D.	Buoyancy lies below its metacenter
Answer» D. Buoyancy lies below its metacenter

Discussion

256.	Efficiency of nozzle governed turbines is affected mainly by losses due to:
A.	Partial admission
B.	Throttling
C.	Interstage pressure drop
D.	Condensation in last stages.
Answer» B. Throttling

Discussion

257.	A shaft was initially subjected to bending moment and then was subjected to torsion. If the magnitude of bending moment is found to be the same as that of the torque, then the ratio of maximum bending stress to shear stress would be:
A.	0.25
B.	0.5
C.	2.0
D.	4
Answer» E.

Discussion

258.	A horizontal beam with square cross-section is simply supported with sides of the square horizontal and vertical and carries a distributed loading that produces maximum bending stress \[\sigma \] in the beam. When the beam is placed with one of the diagonals horizontal the maximum bending stress will be:
A.	\[\frac{1}{\sqrt{2}}\sigma \]
B.	\[\sigma \]
C.	\[\sqrt{2\sigma }\]
D.	\[2\sigma \]
Answer» D. \[2\sigma \]

Discussion

259.	In the centrifugal air compressor design practice, the value of polytropic exponent of compression is generally taken as:
A.	1.2
B.	1.3
C.	1.4
D.	1.5
Answer» D. 1.5

Discussion

260.	The turb machine used to circulate refrigerant in large refrigeration plant is:
A.	A centrifugal compressor
B.	A radial turbine
C.	An axial compressor
D.	An axial turbine
Answer» D. An axial turbine

Discussion

261.	Swiss type screw machines have:
A.	Turrets
B.	Radial slides
C.	Spindle carriers
D.	Tool DOMS
Answer» D. Tool DOMS

Discussion

262.	Consider the following statements related to Turret lathe: 1. Turret is mounted directly on the saddle 2. Turret is mounted on an auxiliary slide 3. Much heavier and larger jobs than Capstan lathe can be produced Which of the above statements is/are correct?
A.	1 and 3
B.	2 and 3
C.	1 only
D.	2 only
Answer» D. 2 only

Discussion

263.	In a multi-spindle automatic machine, on which one of the following factors does the cycle time for each operation depend?
A.	Shortest single-operation
B.	Shortest multi-operations
C.	Longest single-operation
D.	Longest multi-operations
Answer» D. Longest multi-operations

Discussion

264.	Match List-I with List-II and select the correct answer using the codes given below the Lists: List-I List-II A. Quadric cycle chain 1. Rapson's slide B. Single slider crank chain 2. Oscillating cylinder engine mechanism C. Double slider crank chain 3. Ackermann steering mechanism D. Crossed slider crank chain 4. Oldham coupling Codes:
A.	A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3
B.	A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1
C.	A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2
D.	A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1
Answer» E.

Discussion

265.	The effective temperature is a measure of the combined effects of:
A.	Dry bulb temperature and relative humidity
B.	Dry bulb temperature and air motion
C.	Wet bulb temperature and air motion
D.	Dry bulb temperature, relative humidity and air motion.
Answer» E.

Discussion

266.	The expression \[\frac{0.622{{p}_{v}}}{{{p}_{r}}-{{p}_{v}}}\] is used to determine:
A.	Relative humidity
B.	Specific humidity
C.	Degree of saturation
D.	Partial pressure
Answer» C. Degree of saturation

Discussion

267.	Match List-I (positioning of two shafts) with List-II (possible connection) and select the correct answer using the codes given below the Lists: List-I List-II A. Parallel shafts with slight offset 1. Hooke's joint B. Parallel shafts at a reasonable distance 2. Worm and wheel C. Perpendicular shafts 3. Oldham coupling D. Intersecting shafts 4. Belt and pulley Codes:
A.	A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1
B.	A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2
C.	A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2
D.	A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1
Answer» B. A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2

Discussion

268.	Consider the following methods: 1. Energy method 2. Equilibrium method 3. Rayleigh's method. Which of these methods can be used for determining the natural frequency of the free vibrations?
A.	1 and 2
B.	1, 2 and 3
C.	1 and 3
D.	2 and 3
Answer» C. 1 and 3

Discussion

269.	In a simple spring mass vibrating system, the natural frequency \[{{\omega }_{n}}\] of the system is (k is spring stiffness m is mass and \[{{m}_{s}}\] is spring mass):
A.	\[\sqrt{\frac{k}{m-\frac{{{m}_{s}}}{3}}}\]
B.	\[\sqrt{\frac{k}{m+\frac{{{m}_{s}}}{3}}}\]
C.	\[\sqrt{\frac{k}{m+3{{m}_{s}}}}\]
D.	\[\sqrt{\frac{k}{m-3{{m}_{s}}}}\]
Answer» C. \[\sqrt{\frac{k}{m+3{{m}_{s}}}}\]

Discussion

270.	Consider the following statements regarding power screws: 1. The efficiency of a self-locking screw cannot be more than 50% 2. If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50% 3. The efficiency of ACME (trapezoidal) thread is less than that of square thread. Of these statements:
A.	1, 2 and 3-are correct
B.	2 and 3 are correct
C.	1 and 3 are correct
D.	1 and 2 are correct
Answer» B. 2 and 3 are correct

Discussion

271.	Which one of the following is the effect of blade shape on performance of centrifugal compressor?
A.	Backward curved blade has poor efficiency
B.	Forward curved blades has higher efficiency
C.	Backward curved blades lead to stable performance
D.	Forward curved blades produce lower pressure ratio.
Answer» D. Forward curved blades produce lower pressure ratio.

Discussion

272.	Surging basically implies:
A.	Unsteady, periodic and reversed flow
B.	Forward motion of air at a speed above sonic velocity
C.	The surging action due to the blast of blade shap on in a compressor.
D.	Forward movement of aircraft.
Answer» B. Forward motion of air at a speed above sonic velocity

Discussion

273.	Consider the following alignment tests on machine tools: 1. Straightness 2. Flatness 3. Run out 4. Parallelism Which of the above alignment tests on machine tools are common to both lathe and shaper?
A.	1 and 2
B.	2 and 3
C.	3 and 4
D.	1 and 4
Answer» C. 3 and 4

Discussion

274.	Properties of substances like pressure, temperature and density in thermodynamic co-ordinates are:
A.	Path function
B.	Point function
C.	Cyclic function.
D.	Real function
Answer» C. Cyclic function.

Discussion

275.	Hoop stress and longitudinal stress in a boiler shell under internal pressure are \[100\,\text{MN/}{{\text{m}}^{\text{2}}}\] and \[50\,MN/{{m}^{2}}\] respectively. Young's modulus of elasticity and Poisson's ratio of the shell material are \[200\,\text{GN/}{{\text{m}}^{\text{2}}}\] and 0.3 respectively. The hoop strain in boiler shell is:
A.	\[0.425\times {{10}^{-\,3}}\]
B.	\[0.5\times {{10}^{-\,3}}\]
C.	\[0.585\times {{10}^{-\,3}}\]
D.	\[0.75\times {{10}^{-\,3}}\]
Answer» B. \[0.5\times {{10}^{-\,3}}\]

Discussion

276.	The stretch in a steel rod of circular section, having a length ?l' subjected to a tensile load 'P' and tapering uniformly from a diameter \[{{d}_{1}}\] at one end to a diameter \[{{d}_{2}}\] at the other end, is given:
A.	\[\text{Pl/4}\,E{{d}_{1}}{{d}_{2}}\]
B.	\[\text{Pl}\,\pi \,E{{d}_{1}}{{d}_{2}}\]
C.	\[\text{Pl/4}E({{d}_{1}}.{{d}_{2}})\]
D.	\[\text{4P}\text{.l/}\pi \text{.}E.{{d}_{1}}.{{d}_{2}}\]
Answer» E.

Discussion

277.	In a single spindle automatic lathe two tools are mounted on the turret one form tool on the front slide and the other, a parting tool, on the rear slide. The parting tool operation is much longer than form tool operation and they operate simultaneously (overlap) The number of cams required for this job is:
A.	One
B.	two
C.	Three
D.	four
Answer» B. two

Discussion

278.	A diamond locating pin is used in jigs and fixtures because:
A.	Diamond is very hard and wear-resistant
B.	It occupies very little space
C.	It helps-assembly with tolerance on centre
D.	Is has along life
Answer» D. Is has along life

Discussion

279.	Which of the following hydraulic turbines are reaction turbines? 1. Francis 2. Kaplan 3. Propeller
A.	1, 2 and 3
B.	1 and 2 only
C.	2 and 3 only
D.	1 and 3 only
Answer» B. 1 and 2 only

Discussion

280.	A Kaplan turbine is a:
A.	Outward flow reaction turbine
B.	Inward flow impulse turbine
C.	Low head axial flow turbine
D.	High head mixed flow turbine
Answer» D. High head mixed flow turbine

Discussion

281.	Which of the following methods can be used to determine the damping of machine element? 1. Logarithmic method 2. Band-width method 3. Rayleigh method 4. Holzer method, Select the correct answer using the codes given below: Codes:
A.	1 and 3
B.	1 and 2
C.	3 and 4
D.	1, 3 and 4
Answer» C. 3 and 4

Discussion

282.	An electric power generating station produces 400 MW. If the coal releases \[36\,\times \,{{10}^{8}}\] kJ/h of energy, the rate of rejection of heat from the power plant is:
A.	200 MW
B.	400 MW
C.	600 MW
D.	800 MW
Answer» D. 800 MW

Discussion

283.	An ideal gas with initial volume, pressure and temperature of \[0.1\,\,{{m}^{3}},\] 1 bar and \[27{}^\circ C\] respectively is compressed in a cylinder by a piston such that its final volume and pressure are \[0.04\,\,{{m}^{3}}\] and 5 bar respectively, then its final temperature will be:
A.	\[-\,\,123{}^\circ C\]
B.	\[54{}^\circ C\]
C.	\[327{}^\circ C\]
D.	\[600{}^\circ C\]
Answer» D. \[600{}^\circ C\]

Discussion

284.	The diamond riveting is utilized for:
A.	structural work
B.	boiler work
C.	both structural and boiler work
D.	None of these
Answer» B. boiler work

Discussion

285.	The amount of energy returned to the line during regeneration depends on
A.	the initial and final speeds during regenerative braking
B.	efficiency of the system
C.	the train resistance and gradient of track also in case the train is moving down the gradient
D.	all of the above
Answer» C. the train resistance and gradient of track also in case the train is moving down the gradient

Discussion

286.	Change in the internal energy of small temperature change\[\Delta T\]for ideal gas is expressed by the relation
A.	\[\Delta U={{C}_{v}}\times \Delta T\]
B.	\[\Delta \,U={{C}_{P}}\times \Delta T\]
C.	\[\Delta \,U=\frac{{{C}_{p}}}{{{C}_{v}}}\Delta T\]
D.	\[\Delta U=({{C}_{p}}-{{C}_{v}})\,\Delta T\]
Answer» B. \[\Delta \,U={{C}_{P}}\times \Delta T\]

Discussion

287.	In an axial flow gas turbine, the hot gases approach the rotor inlet with an absolute velocity of 600 m/s in a direction \[30{}^\circ \] from the wheel tangent. The gases leave the rotor axially. If the blade speed is 300 m/s, then the theoretical power output per kg/s of gas flow will be approximately:
A.	132 kW
B.	156 kW
C.	172 kW
D.	205 kW.
Answer» E.

Discussion

288.	Match List-I with List-II and select the correct answer using the codes given below the lists: List-I List-II A. Quadric cycle chain 1. Elliptic trammel B. Single slider crank chain 2. Rapsons slide C. Double slider crank chain 3. Ackerman steering D. Crossed slider crank chain 4. Eccentric mechanism 5. Pendulum pump Codes:
A.	A\[\to \]5, B\[\to \]4, C\[\to \]2, D\[\to \]1
B.	A\[\to \]3, B\[\to \]1, C\[\to \]5, D\[\to \]4
C.	A\[\to \]5, B\[\to \]3, C\[\to \]4, D\[\to \]2
D.	A\[\to \]3, B\[\to \]5, C\[\to \]1, D\[\to \]2
Answer» D. A\[\to \]3, B\[\to \]5, C\[\to \]1, D\[\to \]2

Discussion

289.	If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose radius is half the mean radius of the farmer, energy stored in the latter at the same speed will be
A.	Four times the first one
B.	Same as the first one
C.	One-fourth of the first one
D.	One and a half times the first one
Answer» E.

Discussion

290.	A flywheel is fitted to the crankshaft of an engine having 'E' amount of indicated work per revolution and permissible limits of coefficients of fluctuation of energy and speed as \[{{K}_{e}}\] and \[{{K}_{s}}\] respectively. The kinetic energy of the flywheel is then given by:
A.	\[\frac{2{{K}_{e}}E}{{{K}_{s}}}\]
B.	\[\frac{{{K}_{e}}E}{2{{K}_{s}}}\]
C.	\[\frac{{{K}_{e}}E}{{{K}_{s}}}\]
D.	\[\frac{{{K}_{s}}E}{2{{K}_{e}}}\]
Answer» C. \[\frac{{{K}_{e}}E}{{{K}_{s}}}\]

Discussion

291.	The average time between two arrivals of customers at a counter in a ready-made store is 4 min. The average time of the counter clerk to serve the customer is 3 min. The arrivals are distributed as per Poisson distribution and the services art exponential distribution. The probability that a customer arriving at the counter to wait, is:
A.	Zero
B.	0.25
C.	2 and 3
D.	0.75
Answer» E.

Discussion

292.	Time estimates of an activity in a PERT network are: Optimistic time \[{{t}_{0}}\] = 9 days pessimistic time \[{{t}_{p}}\] = 21 days and most likely time tg = days. The time approximates probability of completion of this activity in 13 days is:
A.	16%
B.	0.34
C.	50%
D.	0.84
Answer» B. 0.34

Discussion

293.	Auto-frettage is the method of:
A.	Joining thick cylinders
B.	Calculating stresses in thick cylinders
C.	Prestressing thick cylinders
D.	Increasing the life of thick cylinders
Answer» D. Increasing the life of thick cylinders

Discussion

294.	Given that d = diameter of spring. R = mean radius of coils. n = number of coils, and G = modulus of rigidity. The stiffness of the close-coiled helical spring subject to an axial load W is equal to:
A.	\[\frac{G{{d}^{4}}}{64{{R}^{3}}n}\]
B.	\[\frac{G{{d}^{3}}}{64{{R}^{3}}n}\]
C.	\[\frac{G{{d}^{4}}}{32{{R}^{3}}n}\]
D.	\[\frac{G{{d}^{4}}}{64{{R}^{3}}n}\]
Answer» B. \[\frac{G{{d}^{3}}}{64{{R}^{3}}n}\]

Discussion

295.	If a gas obeys Van-der Waals equation at the critical point, then what does \[\frac{R{{T}_{c}}}{{{P}_{c}}{{V}_{c}}}\] equal to?
A.	Zero
B.	unity
C.	1.50
D.	2.67
Answer» E.

Discussion

296.	For a gas, pressure p, volume v and temperature T are dependent on each other. Then which one of the following \[p\,-\,v\,-T\] relationships will be obeyed?
A.	\[{{\left( \frac{\partial p}{\partial T} \right)}_{v}}\,{{\left( \frac{\partial v}{\partial T} \right)}_{p}}\,{{\left( \frac{\partial v}{\partial p} \right)}_{T}}\,=-\,\,1\]
B.	\[{{\left( \frac{\partial p}{\partial T} \right)}_{v}}\,{{\left( \frac{\partial T}{\partial v} \right)}_{p}}\,{{\left( \frac{\partial v}{\partial p} \right)}_{T}}=-\,\,1\]
C.	\[{{\left( \frac{\partial p}{\partial T} \right)}_{v}}\,{{\left( \frac{\partial v}{\partial T} \right)}_{p}}\,{{\left( \frac{\partial p}{\partial v} \right)}_{T}}=-\,\,1\]
D.	\[{{\left( \frac{\partial p}{\partial T} \right)}_{v}}={{\left( \frac{\partial T}{\partial v} \right)}_{p}}\,{{\left( \frac{\partial p}{\partial v} \right)}_{T}}\]
Answer» C. \[{{\left( \frac{\partial p}{\partial T} \right)}_{v}}\,{{\left( \frac{\partial v}{\partial T} \right)}_{p}}\,{{\left( \frac{\partial p}{\partial v} \right)}_{T}}=-\,\,1\]

Discussion

297.	Which one of the following expressions for Tds is true for a simple compressible substance? (Notations have the usual meaning)
A.	\[dh-vdp\]
B.	\[dh+vdp\]
C.	\[dh-pdv\]
D.	\[dh+pdv\]
Answer» B. \[dh+vdp\]

Discussion

298.	Match List-I with List-II (pertaining to blower performance) and select the correct answer using the codes given below the lists: List-I List-II A. Slip 1. Reduction of whirl velocity B. Stall 2. Fixed mass flow rate regardless of pressure ratio C. Choking 3. Flow separation 4. Flow area separation Codes:
A.	A\[\to \]4, B\[\to \]3, C\[\to \]2
B.	A\[\to \]1, B\[\to \]3, C\[\to \]2
C.	A\[\to \]4, B\[\to \]1, C\[\to \]3
D.	A\[\to \]2, B\[\to \]3, C\[\to \]4
Answer» C. A\[\to \]4, B\[\to \]1, C\[\to \]3

Discussion

299.	Given: \[{{v}_{w\,2}}=\] velocity of whirl at outlet \[{{u}_{2}}=\]Peripheral velocity of the blade tips The degree of reaction in a centrifugal compressor equal to:
A.	\[1-\frac{{{v}_{w\,2}}}{2{{u}_{2}}}\]
B.	\[1-\frac{{{u}_{2}}}{2{{v}_{w\,2}}}\]
C.	\[1-\frac{2{{v}_{w\,2}}}{{{u}_{2}}}\]
D.	\[1-\frac{{{v}_{w\,2}}}{{{u}_{2}}}\]
Answer» C. \[1-\frac{2{{v}_{w\,2}}}{{{u}_{2}}}\]

Discussion

300.	In a gas turbine cycle, the turbine output is 600 kJ/kg, the compressor work is 400 kJ/kg and the heat supplied is 1000 k/kg. The thermal efficiency of this cycle is:
A.	80%
B.	60%
C.	40%
D.	20%
Answer» E.

Discussion

Explore topic-wise MCQs in Railways.

Newton's law of viscosity depends upon the:

Consider the following mechanisms: 1. Geneva gearing 2. Rack and pinion 3. Ratchet and pawl Which of these mechanisms are used to index the work table or a transfer machine?

Machining centre is:

Stability of a freely floating object is assured if its centre of:

Efficiency of nozzle governed turbines is affected mainly by losses due to:

A shaft was initially subjected to bending moment and then was subjected to torsion. If the magnitude of bending moment is found to be the same as that of the torque, then the ratio of maximum bending stress to shear stress would be:

In the centrifugal air compressor design practice, the value of polytropic exponent of compression is generally taken as:

The turb machine used to circulate refrigerant in large refrigeration plant is:

Swiss type screw machines have:

Consider the following statements related to Turret lathe: 1. Turret is mounted directly on the saddle 2. Turret is mounted on an auxiliary slide 3. Much heavier and larger jobs than Capstan lathe can be produced Which of the above statements is/are correct?

In a multi-spindle automatic machine, on which one of the following factors does the cycle time for each operation depend?

The effective temperature is a measure of the combined effects of:

The expression \[\frac{0.622{{p}_{v}}}{{{p}_{r}}-{{p}_{v}}}\] is used to determine:

Consider the following methods: 1. Energy method 2. Equilibrium method 3. Rayleigh's method. Which of these methods can be used for determining the natural frequency of the free vibrations?

In a simple spring mass vibrating system, the natural frequency \[{{\omega }_{n}}\] of the system is (k is spring stiffness m is mass and \[{{m}_{s}}\] is spring mass):

Which one of the following is the effect of blade shape on performance of centrifugal compressor?

Surging basically implies:

Consider the following alignment tests on machine tools: 1. Straightness 2. Flatness 3. Run out 4. Parallelism Which of the above alignment tests on machine tools are common to both lathe and shaper?

Properties of substances like pressure, temperature and density in thermodynamic co-ordinates are:

The stretch in a steel rod of circular section, having a length ?l' subjected to a tensile load 'P' and tapering uniformly from a diameter \[{{d}_{1}}\] at one end to a diameter \[{{d}_{2}}\] at the other end, is given:

A diamond locating pin is used in jigs and fixtures because:

Which of the following hydraulic turbines are reaction turbines? 1. Francis 2. Kaplan 3. Propeller

A Kaplan turbine is a:

Which of the following methods can be used to determine the damping of machine element? 1. Logarithmic method 2. Band-width method 3. Rayleigh method 4. Holzer method, Select the correct answer using the codes given below: Codes:

An electric power generating station produces 400 MW. If the coal releases \[36\,\times \,{{10}^{8}}\] kJ/h of energy, the rate of rejection of heat from the power plant is:

An ideal gas with initial volume, pressure and temperature of \[0.1\,\,{{m}^{3}},\] 1 bar and \[27{}^\circ C\] respectively is compressed in a cylinder by a piston such that its final volume and pressure are \[0.04\,\,{{m}^{3}}\] and 5 bar respectively, then its final temperature will be:

The diamond riveting is utilized for:

The amount of energy returned to the line during regeneration depends on

Change in the internal energy of small temperature change\[\Delta T\]for ideal gas is expressed by the relation

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose radius is half the mean radius of the farmer, energy stored in the latter at the same speed will be

A flywheel is fitted to the crankshaft of an engine having 'E' amount of indicated work per revolution and permissible limits of coefficients of fluctuation of energy and speed as \[{{K}_{e}}\] and \[{{K}_{s}}\] respectively. The kinetic energy of the flywheel is then given by:

Time estimates of an activity in a PERT network are: Optimistic time \[{{t}_{0}}\] = 9 days pessimistic time \[{{t}_{p}}\] = 21 days and most likely time tg = days. The time approximates probability of completion of this activity in 13 days is:

Auto-frettage is the method of:

Given that d = diameter of spring. R = mean radius of coils. n = number of coils, and G = modulus of rigidity. The stiffness of the close-coiled helical spring subject to an axial load W is equal to:

If a gas obeys Van-der Waals equation at the critical point, then what does \[\frac{R{{T}_{c}}}{{{P}_{c}}{{V}_{c}}}\] equal to?

For a gas, pressure p, volume v and temperature T are dependent on each other. Then which one of the following \[p\,-\,v\,-T\] relationships will be obeyed?

Which one of the following expressions for Tds is true for a simple compressible substance? (Notations have the usual meaning)

Given: \[{{v}_{w\,2}}=\] velocity of whirl at outlet \[{{u}_{2}}=\]Peripheral velocity of the blade tips The degree of reaction in a centrifugal compressor equal to:

In a gas turbine cycle, the turbine output is 600 kJ/kg, the compressor work is 400 kJ/kg and the heat supplied is 1000 k/kg. The thermal efficiency of this cycle is: