Equation

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Critical Clearing angle

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Content


(



)

= ∫















sin δ d δ
=



cos



] +








Now substituting






(



)




















(



)

(



)









)



(



)














Now from the curves,
















(

)
or



(

)
or



(




)










1.In shunt dc motor the direction of rotation of the motor will reversed. When
A.either field terminals are reversed or armature terminals are reversed

B. only armature terminals are reversed

C. only field terminals are changed

D. none of above
2. transformer having voltage ratio of 3000/300 V takes a current of 0.7 Amp from the primary at a
power factor of 0.6 under open circuit condition. Calculate the magnetizing current of the
transformer.
A.0.73Amp B.0.58Amp

C. 0.60 Amp

D. 0.56 Amp
3 The crawling in an induction motor is caused by
(a) Improper design of the machine
(b) Low voltage supply
(c) High loads
(d) Harmonics developed in the motor

4.In a synchronous motor, damper winding is provided to
A. Stabilize rotor motion
B. Suppress rotor oscillations
C. Develop necessary starting torque
D. Both B and C
5] The main disadvantages of using short pitch winding in alternators is that it
(a) Reduces harmonics in the generated voltage
(b) Reduces the total voltage around the armature coils
(c) Produces asymmetry in the three phase windings
(d) Increases Cu of end connections









1. Why crystal is being preferred as a clock source?
a. high stability, large Q
b. high stability, low Q
c. high speed, large Q
d. Frequency does drift
2. Mention RST for the TRAP?
a. RST 4
b. RST 3.5
c. RST 4.5
d. RST 5
3. BHE of 8086 microprocessor signal is used to interface the
a. Even bank memory
b. Odd bank memory
c. I/O
d. DMA

4. In which T-state does the CPU sends the address to memory or I/O and the ALE signal
for demultiplexing
a. T1.
b. T2.
c. T3.
d. T4.

5. If the crystal oscillator is operating at 15 MHz, the PCLK output of 8284 is
a. 10 MHz.
b. 5 MHz.
c. 7.5 MHz
d. 2.5 MHz.

6. Number of the times the instruction sequence below will loop before coming out of
loop is
MOV AL, 00h
A1: INC AL
JNZ A1
a. 00
b. 01
c. 256
d. 255

7. The Pentium microprocessor has______execution units.
a. 1
b. 2
c. 3
d. 4

8. Signal voltage ranges for a logic high and for a logic low in RS-232C standard are
a. Low = 0 volt to 1.8 volt, high = 2.0 volt to 5 volt
b. Low =-15 volt to –3 vol, high = +3 volt to +15 volt
c. Low = +3 volt to +15 volt, high = -3 volt to -15 volt
d. Low = 2 volt to 5.0 volt, high = 0 volt to 1.8 volt

9. What will be the contents of register AL after the following has been executed
MOV BL, 8C
MOV AL, 7E
ADD AL, BL
a. 0A and carry flag is set
b. 0A and carry flag is reset
c. 6A and carry flag is set
d. 6A and carry flag is reset
10. Direction flag is used with
a. String instructions.
b. Stack instructions.
c. Arithmetic instructions.
d. Branch instructions.


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