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This set of Thermal Engineering 2 Multiple Choice Questions & Answers (MCQs) focuses on Thermal Engineering II Set 15
Q1 | A nozzle used to send fluid in coherent stream is called as
- jet
- high velocity nozzle
- every nozzle sends fluid in coherent stream
- none of the mentioned
Q2 | In fountains the type of nozzle used is
- none of the mentioned
- turbulent jet
- high speed nozzle
- laminar jet
Q3 | If mach number is less than one then its flow is
- subsonic flow
- turbulent flow
- laminar flow
- none of the mentioned
Q4 | When mach number is greater than one the flow is
- subsonic
- supersonic
- laminar
- none of the mentioned
Q5 | In rocket engines the amount of expansion in Nozzle determines the
- exit temperature
- exit pressure
- exit temperature & pressure
- none of the mentioned
Q6 | De-Laval turbine is a
- multi rotor impulse turbine
- impulse reaction turbine
- single rotor impulse turbine
- none of the mentioned
Q7 | The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
- increases
- decreases
- is unpredictable
- remains same
Q8 | The Parsons’ reaction turbine has
- only moving blades
- only fixed blades
- fixed and moving blades of different shape
- identical fixed and moving blades
Q9 | What is the critical pressure ratio for initially wet steam?
- 0.582
- 0.546
- 0.577
- 0.601
Q10 | The ratio of the useful heat drop to the isentropic heat drop is called
- condenser efficiency
- nozzle efficiency
Q11 | Rateau turbine is
- pressure-velocity compounded turbine
- simple reaction turbine
- velocity compounded turbine
- pressure compounded turbine
Q12 | When the cross-section of a nozzle increases continuously from entrance to exit, it is called a
- convergent-divergent nozzle
- divergent nozzle
- convergent nozzle
- none of the mentioned
Q13 | Aeroderivative engines have pressure ratios
- greater than 30
- lesser than 30 and greater than 20
- greater than 50
- none of the mentioned
Q14 | Aeroderivative engines are larger.
- true
- false
Q15 | Aeroderivative engines release higher emissions.
- true
- false
Q16 | Critical pressure ratio is ratios of pressures at discharge.
- minimum
- none of the mentioned
- optimum
- maximum
Q17 | Ratio of critical pressure to inlet pressure in known as
- none of the mentioned
- pressure ratio
- critical pressure ratio
- isoentropic pressure ratio
Q18 | In De Laval Nozzle critical pressure ratio is given by (2/y+1)^(y/y-1).
- true
- false
Q19 | The exit velocity in the nozzle increases as per
- stagnation point
- continuity equation
- prandtl number
- newton’s law
Q20 | With the increase in pressure, the exit velocity
- decreases
- increases
- same
- independent
Q21 | The Prandtl Number approximates
- momentum diffusivity to thermal diffusivity
- thermal diffusivity to momentum diffusivity
- shear stress to thermal diffusivity
- thermal diffusivity to kinematic viscosity
Q22 | Pumps increase
- pressure
- velocity
- momentum
- heat
Q23 | Which among the following is the formula for volumetric flow rate?
- q = v/a
- q = av
- q = a+v
- q = a-v
Q24 | Which among the following is the formula for mass flow rate?
- q = m/p
- q = mp
- q = m + p
- q = m – p
Q25 | Compressible flow is a flow that deals with
- fluid temperature
- fluid pressure
- fluid density
- fluid geometry