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1. When four resistances of 2W 1W; 5W 2W; 10W 5W and 15W 10 W are connected in parallel, the greatest power is absorbed by • • • •
2 W, 1 W 5 W, 2 W 10 W, 5W 15 W, 10 W
2. A moving coil instrument has a resistance of 10 W and gives full scale deflection when carrying a current of 50 mA. o measure current upto 100 A, we will have to connect • • • •
10 W resistance in series 10 W resistance in parallel 10!1""" W resistance in series 10!1""" W resistance in parallel
#. he ripple voltage in the output of a single phase half wave rectifier with 10 $ rectified dc voltage with resistive load and without filter will be • • • •
12.1 volt 1.21 volt 0.%&2 volt %.&2 volt
%. he transformer connection which has gained considerable popularity to serve #'phase e(uipment and single phase lighting load is • • • •
)tar!)tar *elta!*elta *elta!)tar )tar!*elta
5. ransformer oil tester is used to +now • • • •
ermittivity ermeability *ielectric strength -esistance of the oil
. late separation of a parallel plate air capacitor is reduced +eeping the voltage constant. he energy stored in the capacitor shall • • • •
/ncrease *ecrease -emain constant -emain ero
. 1 Ampere of current is defined as • • • •
1 volt!sec 1 coulomb!sec 1 ohm!second 1 coulomb
&. he synchronous motor can be used as a capacitor • •
y increasing e3citation y decreasing e3citation
• •
y increasing speed y decreasing speed
". he actual speed of an induction motor is always • • • •
4ess than synchronous speed ore than synchronous speed 6(ual to synchronous speed 7one of the above.
10. he purpose of connecting a capacitor in flourescent tube circuit is • • • •
o increase switching on time o decrease switching off time o increase power factor o decrease power consumption
11. he condition for parallel operation of two inverters is • • • •
Amplitude of voltages should be same. 8re(uency of voltages should be same. oth the voltages should be in same phase. All the three above.
12. A 0 9, 2 pole alternator should run at • •
a. #000 r.p.m. b. #00 r.p.m.
c. d.
1500 r.p.m. 1&00 r.p.m.
1#. he purpose of a governer in a *: set is • • • •
1%.
o regulate the speed. o regulate the voltage o regulate the power o regulate the current. A ) - can conduct
• • • •
/n one direction only. /n both directions.
15. he cut'in voltage of a silicon diode is appro3. • • • •
0. volt 0.# volt 1.% volt 7one of the above.
1. he step -ecovery *iode is used as • • • •
8re(uency adder 8re(uency subtractor 8re(uency multiplier 7one of the above.
1. he isolation between input and output in case of opto coupler is of the order of •
10
• • •
1010 ohms 10# ohms 7one of the above.
1&. he transistor configuration to connect % W spea+er with 00 W output impedance audio amplifier is • • • •
ommon 6mitter ommon ase ommon ollector 7one of the above.
1". eta cut'off fre(uency of a transistor is the fre(uency at which the eta is • • • •
0.0 of low fre(uency value =ero 6(ual to low fre(uency value 7one of the above.
20. Which of the following amplifier has the least distortion. • • • •
lass 6 lass * lass lass A
21. inch off voltage of a > 86 is the drain to source voltage above which drain current. • • • •
/ncreases *ecreases -emains constant ecomes ero
22. *ecimal e(uivalent of binary 1111 1111 1111 1111 is • • • •
1,#&% 5,5# 1000000 7one of the above.
2#. A l!2 dipole aerial is used for • • • •
W )W icrowave 7one of the above.
2%. ?< is preferred over 4 oscillator because • • • •
?< is more stable. ?< gives more power ?< is linear. 7one of the above.
25. he angular velocity of geo'stationary satellite is • • •
6(ual to the angular velocity of earth. 4ess than the angular velocity of earth. ore than the angular velocity of earth
•
7one of the above.
2. he battery operated pre'amplifier with a consumption of 10 Watts can wor+ on battery of 12 volt, 100 A9 having efficiency of 50@ for • • • •
120 hrs. 0 hrs. 100 hrs. 10 hrs.
2. 4ow pass filter with cut off fre(uency of 100 +9 and high pass filter with cut off fre(uency of 50 +9 are connected in tandem, the resultant filter is • • • •
4ow pass filter with cut off fre(uency of 100 +9 9igh pass filter with cut off fre(uency of 50 +9 and pass filter with pass band from 50 +9 to 100 +9. 7one of the above.
2&. /n case of oil fire, the fire e3tinguisher used is • • • •
