Category: Mechanical Engineering

Latest multiple choice questions with answers for mechanical engineering students.

Mechanical Engineering MCQs [Quiz 33]

Q1. Film boling occurs at
(a) very low pressure
(b) atmospheric pressures
(c) medium pressures
(d) very high pressures
(e) none of the above.

Q2. Fire tube boilers are limited to a maximum design working pressure of
(a) 1 kg/cm
(b) 6 kg/cm
(c) 17 kg/cm2
(d) 100 kg/cm2
(e) 250 kg/cm2.

Q3. For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has
(a) more heating surface
(b) less heating surface
(c) equal heating surface
(d) heating surface depends on other parameters
(e) none of the above.

Q4. In water wall furnace, the heat is transferred to the water-walls by
(a) convection
(b) radiation
(c) conduction
(d) radiation and conducton
(e) radiation and convection.

Q5. Relative percentage of heat absorbed through the heat transfer of
(i) furnace water wall,
(ii) boiler bank,
(Hi) superheater,
(iv) economiser,
(v) airheater of a typical boiler of 200 MW capacity would be of the order of
(a) 48:20:15:7:10
(b) 10:7:15:20:48
(c) 20:48:7:15:10
(d) 7:15:20:10:48
(e) 48:15:10:7:20.

Q6. The feed check valve is used in order to
(a) regulate flow of boiler water
(b) check level of water in boiler drum
(c) recirculate unwanted feed water
(d) allow high pressure feed water to flow to drum and not allow reverse flow to take place
(e) none of the above.

Q7. The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase
(a) increases
(b) decreases
(c) remains unchanged
(d) increases/decreases depending on steam temperature requirements
(e) unpredictable.

Q8. Feed water conditioning in thermal power plants in done to
(a) reduce hardness and for removal of solids
(b) increase efficiency-of thermal power plant
(c) increase *heat transfer rate
(d) increase steam parameters
(e) all of the above.

Q9. The basic job of feed water treatment in boilers is to overcome the problem of
(a) corrosion
(b) scale
(c) carryover
(d) embrittlement
(e) all of the above

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