Electrical Engineering Quiz 56
1 / 50
A 3-phase synchronous motor is running clockwise. If the direction of its field current is reversed
2 / 50
Hot rolled sheets have ___________ value of permeability?
3 / 50
Following will occur if level of electrolyte falls below plates____________?
4 / 50
The oscillations in a synchronous motor can be damped out by_______________?
5 / 50
The armature current of the synchronous motor
6 / 50
A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly_______________?
7 / 50
Centrifugal switch disconnects the auxiliary winding of the motor at about ______ percent of synchronous speed?
8 / 50
For a power plant which of the following constitutes running cost?
9 / 50
The potential drop in the arc, in a mercury arc rectifier, varies_____________?
10 / 50
A relay is ___________switch?
11 / 50
In a separately excited generator supplying rated load the armature reaction.
12 / 50
The SiO2 layer in an IC acts as ________________?
13 / 50
In ________ system the charging current is intermittently controlled at either a maximum or minimum value
14 / 50
TRIAC is a semiconductor power electronic device which contains____________?
15 / 50
In case of OR gate, no matter what the number of inputs, a____________________?
16 / 50
A closed surface contains two equal and opposite charges. The net electric flux from the surface will be________________?
17 / 50
What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero ?
18 / 50
The percentage O2 by Weight in atmospheric air is____________?
19 / 50
In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that____________?
20 / 50
Battery operated scooter for braking uses________________?
21 / 50
The conductivity of a metal is determined by____________?
22 / 50
Electric locomotives in India are manufactured at______________?
23 / 50
With feedback __________ increases?
24 / 50
The gain of an amplifier is expressed in db because_____________?
25 / 50
Circuit breakers are essentially______________?
26 / 50
The internal efficiency of a mercury arc rectifier depends on___________?
27 / 50
The conductivity of an extrinsic semiconductor with temperature________________?
28 / 50
Which of the following is the advantage of electric braking ?
29 / 50
The artificial draught normally is designed to produce____________?
30 / 50
For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by___________?
31 / 50
The size of the earth or ground wire is based on the______________?
32 / 50
The disc of an instrument using eddy current damping should be of________________?
33 / 50
If a high degree of selectivity is desired, then double-tuned circuit should have ___________ coupling?
34 / 50
With gate open, the maximum anode current at which SCR is turned off from ON condition is called____________?
35 / 50
The critical pressure ratio of a convergent nozzle is defined as_____________?
36 / 50
An oscillator produces___________oscillations?
37 / 50
The ratio of starting torque to running torque in a synchronous motor is____________?
38 / 50
In a A.C. series motor armature coils are usually connected to commutator____________?
39 / 50
The purpose of providing dummy coils in a generator is____________?
40 / 50
The armature core of a D.C. generator is usually made of__________________?
41 / 50
In a push ? pull converter, the filter capacitor can be obtained as____________?
42 / 50
Mercury, in arc rectifiers, is chosen for cathode because________________?
43 / 50
An LC oscillator cannot be used to produce ____________frequencies?
44 / 50
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be______________?
45 / 50
Speed control of a universal motor is achieved by__________?
46 / 50
If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?
47 / 50
Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is__________________?
48 / 50
In an unregulated power supply, if load current increases, the output voltage _____________?
49 / 50
A PNPN device having two gates is ___________?
50 / 50
Which of the following materials has the highest value of dielectric constant___________?
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