Q.1
Find the rate of conduction heat transfer through a 1.5 cm thick board(k = 0.W/m K), with a temperature difference of 20°C between the two sides.
  • a) 113 W/m2
  • b) 413 W/m2
  • c) 313 W/m2
  • d) 213 W/m2
Q.2
A radiant heating lamp has a temperature ofK with ε = 0.What should be the surface area to provideW of radiation heat transfer?
  • a) 0.0035 m2
  • b) 0.0055 m2
  • c) 0.0075 m2
  • d) 0.0095 m2
Q.3
A piston of mass 2 kg is lowered by 0.5 m. Find the work involved in the process.
  • a) 7.805 J
  • b) 8.805 J
  • c) 9.805 J
  • d) 10.805 J
Q.4
An escalator raises akg bucket of waterm inseconds. Determine the amount of work done during the process.
  • a) 9807 J
  • b) 9307 J
  • c) 9507 J
  • d) 9107 J
Q.5
A hydraulic cylinder has a piston(cross sectional area 25cmand a fluid pressure of 2 MPa. If piston moves by 0.25m, how much work is done?
  • a) 0.25 kJ
  • b) 1.25 kJ
  • c) 2.25 kJ
  • d) 3.25 kJ
Q.6
In a thermally insulated kitchen, a refrigerator with 2 kW motor for running the compressor provideskJ of cooling to the refrigerated space duringmin operation. If the condenser coil placed behind the refrigerator rejectskJ of heat to the kitchen during the same period, calculate the change in internal energy of the kitchen.
  • a) 3600 kJ
  • b) 2400 kJ
  • c) 4800 kJ
  • d) none of the mentioned
Q.7
An escalator raises akg bucket of sandm in a minute. Determine the rate of work done during the process.
  • a) 143 W
  • b) 153 W
  • c) 163 W
  • d) 173 W
Q.8
A crane lifts a bucket of cement with a mass ofkg vertically up with a constant velocity of 2 m/s. Find the rate of work.
  • a) 8.83 kW
  • b) 8.33 kW
  • c) 8.53 kW
  • d) 8.63 kW
Q.9
A battery is well insulated while being charged by 12.3 V at a current of 6 A. Take the battery as a control mass and find the instantaneous rate of work.
  • a) 63.8 W
  • b) 73.8 W
  • c) 83.8 W
  • d) 93.8 W
Q.10
A current ofamp runs through a resistor with resistance ofohms. Find the rate of work that heats the resistor up.
  • a) 1200 W
  • b) 1300 W
  • c) 1400 W
  • d) 1500 W
Q.11
A pressure ofkPa pushes a piston of radius 0.m with V = 5 m/s. What is the transmitted power?
  • a) 139.5 kW
  • b) 149.5 kW
  • c) 159.5 kW
  • d) 169.5 kW
Q.12
A torque ofNm rotates a shaft of radius 0.m with ω =rad/s. What is the transmitted power?
  • a) 22.5 kW
  • b) 32.5 kW
  • c) 42.5 kW
  • d) 52.5 kW
0 h : 0 m : 1 s