Related Questions

A man sells chocolates which are in the boxes. Only either full box or half a box of chocolates can be purchased from him. A customer comes and buys half the number of boxes which the seller had plus half box more. A second customer comes and purchases half the remaining number of boxes plus half a box. After this the seller is left with no chocolate boxes. How many chocolate boxes the seller had initially?
ক 2
খ 3
গ 4
ঘ 3.5
ঙ None of these
In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed
ক 10 mm
খ 15 mm
গ 20 mm
ঘ 25 mm
In a single phase power factor meter the phase difference between the currents in the two pressure coils is
ক exactly 0°
খ approximately 0°
গ exactly 90°
ঘ approximately 90°
The no-load current drawn by transformer is usually what per cent of the full-load current?
ক 0.2 to 0.5 per cent
খ 2 to 5 per cent
গ 12 to 15 per cent
ঘ 20 to 30 per cent
An ideal transformer will have maximum efficiency at a load such that
ক copper loss = iron loss
খ copper loss
গ copper loss > iron loss
ঘ none of the above
For a transformer, operating at constant load current, maximum efficiency will occur at
ক 0.8 leading power factor
খ 0.8 lagging power factor
গ zero power factor
ঘ unity power factor
The power factor of a single phase load can be calculated if the instruments available are
ক one voltmeter and one ammeter
খ one voltmeter, one ammeter and one wattmeter
গ one voltmeter, one ammeter and one energy meter
ঘ any of the above
The output transformer used in a power amplifier is a ___________ transformer
ক 1:1 ratio
খ Step-up
গ Step-down
ঘ None of the above
Power amplifiers generally use transformer coupling because transformer per-mits
ক Cooling of the circuit
খ Impedance matching
গ Distortionless output
ঘ Good frequency response
M, N and P were each paid the same hourly rate rate to rate to paint a building.M worked for a full day, N worked for half a day and P worked half as long as N worked. Together they earned BDT 560. How much money did N receive?
ক 240
খ 160
গ 100
ঘ 320

Next steps