Q2.A simply supported beam PQ is loaded by a moment of 1kN-m at the mid-span of
the beam as shown in the figure. The reaction forces RP and RQ at supports P
and Q respectively are
Answer : Option AExplaination / Solution:
Take moments about ‘Q’
Q3.The contents of a well-insulated tank are heated by a resistor of 23Ω in which
10A current is flowing. Consider the tank along with its contents as a
thermodynamic system. The work done by the system and the heat transfer to
the system are positive. The rates of heat (Q), work (W) and change in internal
energy (∆U) during the process in kW are
Q5.Figure shows the schematic for the measurement of velocity of air (density =
1.2kg /m3 ) through a constant–area duct using a pitot tube and a water-tube
manometer. The differential head of water (density = 1000 kg /m3) in the two
columns of the manometer is 10mm. Take acceleration due to gravity as 9.8m / s2. The velocity of air in m/s is
Answer : Option CExplaination / Solution:
From Bernoulli’s equation
Q7.The values of enthalpy of steam at the inlet and outlet of a steam turbine in a
Rankine cycle are 2800kJ/kg and 1800kJ/kg respectively. Neglecting pump work,
the specific steam consumption in kg/kW-hour is
Answer : Option AExplaination / Solution:
Work done by the turbine
W = 2800 – 1800 = 1000 kJ/kg = 1000 kW-s/kg
Specific fuel consumption = (1/1000)×3600 = 3.6 kg / kw-hr
Q10.The ratios of the laminar hydrodynamic boundary layer thickness to thermal
boundary layer thickness of flows of two fluids P and Q on a flat plate are 1/2
and
2 respectively. The Reynolds number based on the plate length for both the flows
is 104. The Prandtl and Nusselt numbers for P are 1/8
and 35 respectively. The
Prandtl and Nusselt numbers for Q are respectively
Answer : Option AExplaination / Solution:
Total Question/Mark :
Scored Mark :
Mark for Correct Answer : 1
Mark for Wrong Answer : -0.5
Mark for Left Answer : 0