Electrical Engineering Quiz 40
1 / 50
For which of the following protection from negative sequence currents is provided ?
2 / 50
Voltage Series feedback also called series-shunt feedback) results in__________?
3 / 50
The rupture of co-valent bonds will occur when the electric field is__________________?
4 / 50
When a transistor is driven to cut off, ideally the output is _______________?
5 / 50
The ac voltage controller can be used for ___________?
6 / 50
An amplifier without feedback has a voltage gain of 50,input resistance os 1 K? & Output resistance of 2.5K?.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
7 / 50
The lead-acid cell should never be discharged beyond____________?
8 / 50
Magnetic field in a D.C. generator is produced by_______________?
9 / 50
In CE arrangement, the value of input impedance is approximately equal to ______________?
10 / 50
The delay fuses are used for the protection of ___________?
11 / 50
For an overhead line, the surge impedance is taken as________________?
12 / 50
A fuse is never inserted in____________?
13 / 50
Electric current passing through the circuit produces_____________?
14 / 50
When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?
15 / 50
The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
16 / 50
Capacitive susceptance is a measure of__________?
17 / 50
Dynamic equalising circuit is useful____________?
18 / 50
The motor used on small lathes is usually_________?
19 / 50
The input resistance of a VTVM is about ______________?
20 / 50
On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
21 / 50
The power demand can be estimated approximately by____________?
22 / 50
The term ?cogging? is associated with___________?
23 / 50
A current amplification of 2000 is a gain of_________________?
24 / 50
Effect of moisture on the insulating materials is to________________?
25 / 50
The most suited gate pulses given to the AC regulator with R ? L load can be in the form of____________?
26 / 50
An emitter follower has ______________input impedance?
27 / 50
Fleming?s right-hand rule regarding direction of induced e.m.f., correlates__________?
28 / 50
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
29 / 50
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
30 / 50
The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?
31 / 50
A switch has ______________?
32 / 50
Conductance : mho :: ____________?
33 / 50
A Weston frequency meter is_____________?
34 / 50
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
35 / 50
The surge resistance of cable is__________?
36 / 50
1 db corresponds to_____________change in voltage or current level?
37 / 50
In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
38 / 50
Basically a potentiometer is a device for________________?
39 / 50
In a transistor if ? = 100 and collector current is 10 mA, then IE is___________?
40 / 50
need frequent starting and stopping of electric motors ?
41 / 50
In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?
42 / 50
method has leading power factor____________?
43 / 50
The series field of a short-shunt D.C. generator is excited by_______________?
44 / 50
A series resonant band-pass filter consists of a 2 mH coil, a 0.005 ?F capacitor, and a 120 ? resistor. The winding resistance of the coil is 12 ?. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?
45 / 50
Which of the following can be measured by the use of a tachogenerator ?
46 / 50
In a pure resistive circuit__________?
47 / 50
Dielectric strength of medium____________?
48 / 50
Power amplifiers generally use transformer coupling because transformer permits______________?
49 / 50
Murray loop test can be used for location of________________?
50 / 50
Very large values of modulation index (greater than 3.24) lead to___________?
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