1) Consider the below diagram of jet of water striking flat stationary plate normal to jet. What will be the phase of workdone on the plate?
a. negative
b. positive
c. zero
d. unpredictable
Answer
Explanation

ANSWER: zero
Explanation: No explanation is available for this question!


2) The radial force in rotodynamic machine, which is developed by rate of change of momentum in radial velocity, is taken care by__________.
a. journal bearing
b. radial thrust bearing
c. both a. and b.
d. none of the above
Answer
Explanation

ANSWER: journal bearing
Explanation: No explanation is available for this question!


3) The product of force (F) and time (t) is called as________.
a. momentum
b. work done
c. impulse
d. pressure
Answer
Explanation

ANSWER: impulse
Explanation: No explanation is available for this question!


4) What is the formula for forces exerted by fluid on a body?
a. (Rate of momentum in) x (Rate of momentum out)
b. (Rate of momentum in) – (Rate of momentum out)
c. (Rate of momentum in) + (Rate of momentum out)
d. None of the above
Answer
Explanation

ANSWER: (Rate of momentum in) – (Rate of momentum out)
Explanation: No explanation is available for this question!


5) Meridonial velocity is the resultant of _____________ components of fluid velocity.
a. radial and tangential
b. tangential and axial
c. radial and axial
d. unpredictable
Answer
Explanation

ANSWER: radial and axial
Explanation: No explanation is available for this question!


6) _______________ components of fluid velocity have the responsibility of the transportation of fluid through the machine.
a. Radial and tangential
b. Tangential and axial
c. Radial and axial
d. None of the existing
Answer
Explanation

ANSWER: Radial and axial
Explanation: No explanation is available for this question!


7) Which component of fluid velocity is responsible for transmission of power through rotodynamic machine?
a. Radial
b. Axial
c. Tangential
d. None of the above
Answer
Explanation

ANSWER: Tangential
Explanation: No explanation is available for this question!


8) What is the general energy equation for transfer of energy between the fluid and machine?
Where, V_{w1} = Tangential component of the velocity of fluid at the entry of the rotor V_{w2} = Tangential component of the velocity of fluid at the exit of the rotor u_{1} = Peripheral velocity of fluid at the entry of the rotor u_{2} = Peripheral velocity of fluid at the exit of the rotor ṁ = Flow rate of fluid
a. E = ṁ (V _{w1} – V _{w2}) x (u _{1} – u _{2})
b. E = ṁ (V _{w1} – V _{w2}) / (u _{1} – u _{2})
c. E = ṁ (V _{w1} u _{1} – V _{w2} u _{2})
d. E = ṁ (V _{w1} u _{1} – V _{w2} u _{2}) ^{2}
Answer
Explanation

ANSWER: E = ṁ (V_{w1} u_{1} – V_{w2} u_{2})
Explanation: No explanation is available for this question!


9) If (V_{w1} u_{1} – V_{w2} u_{2}), then machine is called as________.
a. compressor
b. turbine
c. pump
d. all of the above
Answer
Explanation

ANSWER: turbine
Explanation: No explanation is available for this question!


10) Consider the following diagram of jet of water striking flat stationary plate inclined at an angle θ. What will be the phase of workdone on the plate?
a. negative
b. positive
c. zero
d. unpredictable
Answer
Explanation

ANSWER: zero
Explanation: No explanation is available for this question!

