Practice Power Plant Engineering In EE Multiple Choice Questions Quiz-3 - MCQGeeks.com

Q.1

Solar thermal power generation can be achieved by

using focusing collector or heliostates
using flat plate collectors
using a solar pond
any of the above system

Q.2

The capacity of large turbo-generators varies from

20 to 100 MW
50 to 300 MW
70 to 400 MW
100 to 650 MW

Q.3

The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation

pvls=C
pv1126 = C
pv1A = C
pv = C

Q.4

In a surface condenser if air is removed, there is

fall in absolute pressure maintained in condenser
rise in absolute pressure maintained in condenser
no change in absolute pressure in the condenser
rise in temperature of condensed steam

Q.5

Economiser is used to heat

air
feed water
flue gases
all above

Q.6

Steam turbines are governed by the following methods

Throttle governing
Nozzle control governing
By-pass governing
all of the above

Q.7

The cooling section in the surface condenser

increases the quantity of vapour extracted along with air
reduces the quantity of vapour extracted along with air
does not affect vapour quantity extracted but reduces pump capacity of air extraction pump
none of the above

Q.8

The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is

Higher
Lower
Same as long as initial pressure and temperature is unchanged
None of the above

Q.9

In steam turbines the reheat factor

increases with the increase in number of stages
decreases with the increase in number of stages
remains same irrespective of number of stages
none of the above

Q.10

The maximum percentage gain in Regenerative feed heating cycle thermal efficiency

increases with number of feed heaters increasing
decreases with number of feed heaters increasing
remains same unaffected by number of feed heaters
none of the above

Q.11

Rateau steam turbine is

reaction steam turbine
velocity compounded impulse steam turbine
pressure compounded impulse steam turbine
pressure velocity compounded steam turbine

Q.12

Caking coals are those which

burn completely
burn freely
do not form ash
form lumps or masses of coke

Q.13

TravelUng grate stoker can burn coals at the rates of

50 - 75 kg/m per hour
75 - 100 kg/m per hour
100— - kg/m per hour
150 - 200 kg/m² per hour

Q.14

In case of impulse steam turbine

there is enthalpy drop in fixed and moving blades
there is enthalpy drop only in moving blades
there is enthalpy drop in nozzles
none of the above

Q.15

Load center in a power station is

Center of coal fields
Center of maximum load of equipments
Center of gravity of electrical system
None of the above

Q.16

The efficiency of chimney is approximately

80%
40%
20%
0.25%

Q.17

Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is

underfeed stoker
overfeed stoker
any
none of the above

Q.18

The pressure on the two sides of the impulse wheel of a steam turbine

is same
is different
increases from one side to the other side
decreases from one side to the other side

Q.19

The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is

0.555
0.578
0.5457
0.6

Q.20

The draught in locomotive boilers is produced by

forced fan
chimney
steam jet
only motion of locomotive

0 h : 0 m : 1 s