Electrical Engineering Quiz 9
1 / 50
Which of the following methods is used for air cooling of turbo-alternators ?
2 / 50
For derries and winches which of the following drives can be used ?
3 / 50
The conduction of electricity, in semiconductors, takes place due to movement of______________?
4 / 50
The parallel combination of a 6.8 k? resistor and a 10 k? resistor is in series with the parallel combination of a 2.2 k? resistor and a 1 k? resistor. A 100 V source is connected across the circuit. The resistor(s) with the greatest voltage drop is (are)___________?
5 / 50
A 25eV electron has a speed of______________?
6 / 50
increases the steady state accuracy?
7 / 50
Distribution transformers are generally designed for maximum efficiency around________________?
8 / 50
In rectifiers, load current flow is_________?
9 / 50
The maximum power developed in a synchronous motor occurs at a coupling angle of____________?
10 / 50
Due to non sinusoidal waveform of the input current, the power factor of the rectifier is____________?
11 / 50
No-load speed of which of the following motor will be highest ?
12 / 50
A single phase full bridge inverter can operated in load commutation mode in case load consist of______?
13 / 50
In a D.C. machine the current per brush arm should not be more than_____________?
14 / 50
During gate recovery time_____________?
15 / 50
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will__________
16 / 50
Which of the following applications always have some load whenever switched on ?
17 / 50
Which one is most suitable power device for high frequency (>100 KHz) switching application?
18 / 50
Which of the following motors is used in tape-recorders ____________?
19 / 50
Most efficient plants are normally used as____________?
20 / 50
The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?
21 / 50
Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
22 / 50
The bridge used for the measurement of the value of the capacitance is____________?
23 / 50
In D.C. shunt motors as load is reduced__________________?
24 / 50
The number of stages that can be directly coupled is limited because___________?
25 / 50
A tuned amplifier uses__________load?
26 / 50
If P is the power of a star connected system then what will be power of an equivalent delta connected system?
27 / 50
The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________?
28 / 50
In hydro power plant, the graph between discharge and time is known as___________?
29 / 50
The main disadvantage of a mechanical switch is that it_______________?
30 / 50
When load current is zero, the Zener current will be_____________?
31 / 50
Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?
32 / 50
With feed back __________ reduces?
33 / 50
There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 m The current through the fourth resistor is______________?
34 / 50
A semiconductor is formed by ______________bonds?
35 / 50
Four 8 ? speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers_____________?
36 / 50
The phosphors for which of the following pair are 180? out of phase for VL, VC and VR______?
37 / 50
A multirangq instrument has________________?
38 / 50
Which of the following drives is suitable for mines where explosive gas exists ?
39 / 50
The typical time of rising time lies between______________?
40 / 50
For which of the following power plants highly skilled engineers are required for running the plants?
41 / 50
In a Schering bridge the potential of the detector above earth potential is______________?
42 / 50
Which of the following is not a routine test on transformers ?
43 / 50
For a diesel generating station the useful life is expected to be around_________Years?
44 / 50
For the induced draught the fan is located_______________?
45 / 50
A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?
46 / 50
The d.c. resistance of a crystal diode is ______________ its a.c. resistance?
47 / 50
When one leg of parallel circuit is opened out the total current will______________?
48 / 50
As -the load is increased the speed of D.C. shunt motor will____________?
49 / 50
When a crystal diode is used as a rectifier, the most important consideration is ____________?
50 / 50
If the supply voltage for a D.C. motor is increased, which of the following will decrease ?
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