Electrical Engineering Quiz 7
1 / 50
Varistors are______________?
2 / 50
If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to______________?
3 / 50
Charging a sulphated battery at high rate results in___________?
4 / 50
Non-linear resistors______________?
5 / 50
The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following ?
6 / 50
For frequencies above the resonant frequency, a parallel LC circuit behaves as a ____________ load?
7 / 50
For heating element high resistivity material is chosen to______________?
8 / 50
In a mercury arc rectifier________ flow from anode to cathode
9 / 50
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 K The no. of parallel path are 6. The efficiency of the switch is______________________?
10 / 50
The thickness of the layer of insulation on the conductor, in cables, depends upon___________?
11 / 50
In the cables, the location of fault is usually found out by comparing____________?
12 / 50
Burden of a protective relay is the power______________?
13 / 50
For an Op-amp with negative feedback, the output is_________________?
14 / 50
Aluminium when adopted as a conductor material in __________ transformers, decreases the overall cost of the transformer?
15 / 50
Pressure cables are generally not used beyond__________?
16 / 50
If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be___________?
17 / 50
is that property of a capacitor which delays any change of voltage across it ?
18 / 50
A negative clipper removes the ______________half-cycles of the input voltage?
19 / 50
In induction heating ___________ is abnormally high?
20 / 50
The active materials on the positive and negative plates of a fully charged lead-acid battery are_______?
21 / 50
DIAC and TRIAC both are semiconductors devices and conduct in____________________?
22 / 50
The resistance of armature winding depends on
23 / 50
To measure and voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken_______________?
24 / 50
An ohmmeter is a____________?
25 / 50
The electrostatic stress in underground cables is_________?
26 / 50
D.C. servomotors are used in______________?
27 / 50
Air-core coils are practically free from______________?
28 / 50
In a power plant if the maximum demand on the plant is equal to the plant capacity, then
29 / 50
For power output higher than 15 kW, the suitable rectifier is________________?
30 / 50
Two generators are running in parallel. One of the generators may run as motor for which of the following reasons ?
31 / 50
On which of the following effects of electric current a fuse operates ?
32 / 50
The main source of production of biogas is__________________?
33 / 50
Transistor biasing is generally provided by a_______________?
34 / 50
Armature reaction of an unsaturated D.C. machine is_____________?
35 / 50
Brushes of D.C. machines are made of_________?
36 / 50
The positive clipper is that which removes the ____________half-cycles of the input voltage?
37 / 50
The power factor at resonance in R-L- C parallel circuit is________?
38 / 50
In a crystal, an atom vibrates at a frequency determined by_______________?
39 / 50
When two D.C. series motors are connected in parallel, the resultant speed is____________?
40 / 50
Resistance of a material always decreases if___________?
41 / 50
The doping level in a zener diode is______________ that of a crystal diode?
42 / 50
Thermocouples are mainly used for the measurement of_____________?
43 / 50
Practical way of obtaining static voltage equalization in series connected SCRs is by the use of____________?
44 / 50
A Zener diode is used as a _____________voltage regulating device?
45 / 50
A shaded pole motor does not possess___________?
46 / 50
In a synchronous motor, the magnitude of stator back e.m.f. Eb depends on___________?
47 / 50
An IC has _______________size?
48 / 50
If a shunt motor is started with its field winding open then___________?
49 / 50
________________ motor is a constant speed motor?
50 / 50
Which of the following generating station has minimum running cost ?
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