Steam Boilers and Engines

1.The object of producing draught in a boiler is

to provide an adequate supply of air for the fuel combustion to exhaust the gases of combustion from the combustion chamber to discharge the gases of combustion to the atmosphere through the chimney all of the above

2.In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

water space also chimney steam space superheater

3.In water tube boilers

water passes through the tubes which are surrounded by flames and hot gases the flames and hot gases pass through the tubes which are surrounded by water forced circulation takes place none of these

4.Which of the following statement is wrong ?

Locomotive boiler is a water tube boiler. Water tube boilers are internally fired. La-mont boiler is a low pressure water tube boiler. all of the above

5.When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

slow speed engine medium speed steam engine high speed steam engine none of these

Fuels and Combustion

1.Higher efficiency in the combustion of solid fuel can not be achieved by

proper fuel preparation. keeping the flue gas exhaust temperature very high. adopting efficient-fuel firing technique & equipment. supplying correct quantity of combustion air.

2.A coal containing very high percentage of durain is called __________ coal.

bright splint non-banded boghead

3. During combustion of gaseous fuels, deficiency of air

engthens the flame. tends to shorten the flame. does not affect the flame length. increases the flame temperature.

4.Gross and net calorific value of a fuel will be the same

if its ash content is zero. ifits carbon content is very low. if its hydrogen/hydrogen compound content is zero. under no circumstances.

5.Low temperature carbonisation

is mainly for producing the smokeless domestic coke. is meant for the production of 'metallurgical coke'. produces higher quantity of gas than high temperature carbonisation. produces less quantity of tar than high temperature carbonisation.

Voltage, Current and Resistance

1.When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

increases decreases remains constant reaches zero

2.The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

1,000 V 2,000 V 31.25 V 3,125 V

3.For a given wirewound core, an increase in current through the coil

reverses the flux lines decreases the flux density increases the flux density causes no change in flux density

4.If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

increases decreases remains the same doubles

5.When the current through the coil of an electromagnet reverses, the

direction of the magnetic field reverses direction of the magnetic field remains unchanged magnetic field expands magnetic field collapses

Magnetism and Electromagnetism

1.When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

increases decreases remains constant reaches zero

2.The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

1,000 V 2,000 V 31.25 V 3,125 V

3.For a given wirewound core, an increase in current through the coil

reverses the flux lines decreases the flux density increases the flux density causes no change in flux density

4.If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

increases decreases remains the same doubles

5.When the current through the coil of an electromagnet reverses, the

direction of the magnetic field reverses direction of the magnetic field remains unchanged magnetic field expands magnetic field collapses

Transformers

1.What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

4 kVA 0.25 kVA 16 kVA 8 kVA

2. The turns ratio required to match an 80 source to a 320 ohm load is

80 20 4 2

3.When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

12V 120V 240V 2400 V

4.If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 ?

250 25 6250 62500

5.A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

0.2 0.4 5 25

Radio Receivers

1.The noise generated by a resistor depends upon

its resistance value its operating temperature both its resistance value and operating temperature none of the above

2.In a superheterodyne receiver

the IF stage has better selectivity than RF stage the RF stage has better selectivity than IF stage the RF stage has same selectivity than IF stage none of the above

3.The function of an AM detector circuit is to

rectify the input signal discard the carrier provide audio signal all of the above

4.Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?

Variable selectivity Variable sensitivity Double conversion Squelch

5.Most popular IF for receivers tuning to 540 to 1650 kHz is

433 kHz 455 kHz 545 kHz 555 kHz

Satellite Communication

1.The first geostationary satellite launched in 1965 was called

ANIK EARLY BIRD (Intelsat-I) WESTAR MOLNIYA

2.Rotation of a geosynchronous satellite means its

drift from stationary position wobbling three-axis stabilization three-dimensional stabilization

3.The present total cost per watt of power generation in geosynchronous orbit is nearly Rs.

20 50 100 5

4.Noise temperature of Sun is more than __________ °K.

1000 5000 100000 500

5.A 20 m antenna gives a certain uplink gain at frequencies of 4/6 GHz. For getting same gain in the 20/30 GHz band, antenna size required is metre.

100 4 1 10

Railways

1.Mr. W. Simms, the consulting Engineer to the Government of India recommended the gauge for Indian railways

1.435 m as adopted in England 1.800 m as per Indian conditions 1.676 m as a compromise gauge 1.000 m as a standard gauge

2.If absolute levels of rails at the consecutive axles A, B, and C separated by 1.8 metres are 100.505 m, 100.530 m, and 100.525 m respectively, the unevenness of rails, is

0.065 m 0.055 m 0.045 m 0.035 m

3.A CST-9 sleeper consists of

two inverted triangular pots on either side of rail seat a central plate with a projected key and box on the top of plate a single two way key provided on the gauge side to hold the rail to sleeper all the above

4.Charles Vignoles invented the flat footed rails in

1814 1836 1846 1873

5.To design a cross-over between parallel tracks, the required components are :

two switch, points, two acute angle crossings and two check rails two switch points, two acute angle crossings and four check rails two switch points, two acute angle crossings and six check rails none of these.

Banking - Latest Current Affairs

1.How many banks have been allowed to exit the PCA framework?

3 5 4 6

2.Ajai Kumar is appointed as the interim CEO of this bank, recently.

Yes Bank Axis Bank KVB Bank IDBI Bank

3.Which of the following bank will inject Rs 37,500 crore through OMO in February?

HDFC SBI RBI Axis

4.With which bank, Etihad Guest tie-up to launch premium card for international travel?

ICICI Card SBI Card Axis Card HDFC Card

5.Which bank recommended Unconditional Cash Transfer to farmers to alleviate the agrarian distress instead of Universal Basic Income (UBI) scheme?

NABARD SBI Punjab National Bank Corporation Bank