Electrical Engineering Quiz 40
1 / 50
The lead-acid cell should never be discharged beyond____________?
2 / 50
For which of the following protection from negative sequence currents is provided ?
3 / 50
Murray loop test can be used for location of________________?
4 / 50
Effect of moisture on the insulating materials is to________________?
5 / 50
When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?
6 / 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 ?
7 / 50
A switch has ______________?
8 / 50
When a transistor is driven to cut off, ideally the output is _______________?
9 / 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___________?
10 / 50
In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
11 / 50
The rupture of co-valent bonds will occur when the electric field is__________________?
12 / 50
The power demand can be estimated approximately by____________?
13 / 50
Very large values of modulation index (greater than 3.24) lead to___________?
14 / 50
The input resistance of a VTVM is about ______________?
15 / 50
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
16 / 50
In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?
17 / 50
On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
18 / 50
For an overhead line, the surge impedance is taken as________________?
19 / 50
The motor used on small lathes is usually_________?
20 / 50
In a pure resistive circuit__________?
21 / 50
The surge resistance of cable is__________?
22 / 50
Conductance : mho :: ____________?
23 / 50
Which of the following can be measured by the use of a tachogenerator ?
24 / 50
Dielectric strength of medium____________?
25 / 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)?
26 / 50
Voltage Series feedback also called series-shunt feedback) results in__________?
27 / 50
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
28 / 50
In CE arrangement, the value of input impedance is approximately equal to ______________?
29 / 50
Capacitive susceptance is a measure of__________?
30 / 50
A fuse is never inserted in____________?
31 / 50
Basically a potentiometer is a device for________________?
32 / 50
method has leading power factor____________?
33 / 50
A Weston frequency meter is_____________?
34 / 50
In a transistor if ? = 100 and collector current is 10 mA, then IE is___________?
35 / 50
The series field of a short-shunt D.C. generator is excited by_______________?
36 / 50
1 db corresponds to_____________change in voltage or current level?
37 / 50
A current amplification of 2000 is a gain of_________________?
38 / 50
The term ?cogging? is associated with___________?
39 / 50
Power amplifiers generally use transformer coupling because transformer permits______________?
40 / 50
The ac voltage controller can be used for ___________?
41 / 50
need frequent starting and stopping of electric motors ?
42 / 50
Electric current passing through the circuit produces_____________?
43 / 50
The most suited gate pulses given to the AC regulator with R ? L load can be in the form of____________?
44 / 50
An emitter follower has ______________input impedance?
45 / 50
Magnetic field in a D.C. generator is produced by_______________?
46 / 50
Dynamic equalising circuit is useful____________?
47 / 50
Fleming?s right-hand rule regarding direction of induced e.m.f., correlates__________?
48 / 50
The delay fuses are used for the protection of ___________?
49 / 50
The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?
50 / 50
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
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