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