236 + Mcqs in Transistors Page 4 McqOptions

151.	_ In a transistor amplifier circuit VCE = VCB + ___________$?
A.	VBE
B.	2 VBE
C.	5 VBE
D.	None of the above
Answer» B. 2 VBE

Discussion

152.	_ In voltage divider bias, operating point is 3 V, 2 mA. If VCC = 9 V, RC = 2.2 k≈í¬©, what is the value of RE ?$?
A.	2000 ‚Äö√ë¬∂
B.	1400 ‚Äö√ë¬∂
C.	800 ‚Äö√ë¬∂
D.	1600 ‚Äö√ë¬∂
Answer» D. 1600 ‚Äö√ë¬∂

Discussion

153.	_ The phase difference between the input and output voltages in a common base arrangement is ___________$?
A.	180¬¨‚àû
B.	90¬¨‚àû
C.	270¬¨‚àû
D.	0¬¨‚àû
Answer» E.

Discussion

154.	_ Tuned class C amplifiers are used for RF signals of ___________$?
A.	Low power
B.	High power
C.	Very high power
D.	None of the above
Answer» E.

Discussion

155.	_ In a pnp transistor, the current carriers are ___________$?
A.	acceptor ions
B.	donor ions
C.	free electrons
D.	holes
Answer» E.

Discussion

156.	__In the double tuned circuit, if the mutual inductance between the two tuned circuits is decreased, the level of resonance curve _____________
A.	Remains the same
B.	Is lowered
C.	Is raised
D.	None of the above
Answer» D. None of the above

Discussion

157.	__At series or parallel resonance, the circuit power factor is _____________
A.	0%
B.	5%
C.	10%
D.	8%
Answer» D. 8%

Discussion

158.	__If a high degree of selectivity is desired, then double-tuned circuit should have ___________ coupling__
A.	Loose
B.	Tight
C.	Critical
D.	None of the above
Answer» B. Tight

Discussion

159.	__A tuned amplifier is used in ___________ applications__
A.	Radio frequency
B.	Low frequency
C.	Audio frequency
D.	None of the above
Answer» B. Low frequency

Discussion

160.	__Transistor biasing is generally provided by a _____________
A.	Biasing circuit
B.	Bias battery
C.	Diode
D.	None of the above
Answer» B. Bias battery

Discussion

161.	__IC = [a / (1 - a )] IB + [ / (1 - a )]__
A.	ICBO
B.	ICEO
C.	IC
D.	IE
Answer» B. ICEO

Discussion

162.	__Double tuned circuits are used in ___________ stages of a radio receiver__
A.	IF
B.	Audio
C.	Output
D.	None of the above
Answer» B. Audio

Discussion

163.	__For proper operation of the transistor, its collector should have _____________
A.	Proper forward bias
B.	Proper reverse bias
C.	Very small size
D.	None of the above
Answer» C. Very small size

Discussion

164.	__The value of ‚àö√º for a transistor is generally _____________
A.	1
B.	less than 1
C.	between 20 and 500
D.	above 500
Answer» D. above 500

Discussion

165.	_At parallel resonance, the line current is ___________$?
A.	Minimum
B.	Maximum
C.	Quite large
D.	None of the above
Answer» B. Maximum

Discussion

166.	_The circuit that provides the best stabilization of operating point is ___________$?
A.	Base resistor bias
B.	Collector feedback bias
C.	Potential divider bias
D.	None of the above
Answer» D. None of the above

Discussion

167.	_As the temperature of a transistor goes up, the base emitter resistance ___________$?
A.	decreases
B.	increases
C.	remains the same
D.	none of the above
Answer» B. increases

Discussion

168.	_For frequencies above the resonant frequency, a parallel LC circuit behaves as a ___________ load$?
A.	Capacitive
B.	Resistive
C.	Inductive
D.	None of the above
Answer» B. Resistive

Discussion

169.	_The value of a of a transistor is ___________$?
A.	more than 1
B.	less than 1
C.	1
D.	none of the above
Answer» C. 1

Discussion

170.	_In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then ___________$?
A.	XL increases and XC decreases
B.	XL decreases and XC increases
C.	Both XL and XC increase
D.	Both XL and XC decrease
Answer» B. XL decreases and XC increases

Discussion

171.	_In a base resistor method, if the value of ‚àö√º changes by 50, then collector current will change by a factor$?
A.	25
B.	50
C.	100
D.	200
Answer» C. 100

Discussion

172.	_The voltage gain of a tuned amplifier is ___________ at resonant frequency$?
A.	Minimum
B.	Maximum
C.	Half-way between maximum and minimum
D.	Zero
Answer» C. Half-way between maximum and minimum

Discussion

173.	_IC = aIE + ___________$?
A.	IB
B.	ICEO
C.	ICBO
D.	‚àö√ºIB
Answer» D. ‚àö√ºIB

Discussion

174.	_The base resistor method is generally used in$?
A.	Amplifier circuits
B.	Switching circuits
C.	Rectifier circuits
D.	None of the above
Answer» C. Rectifier circuits

Discussion

175.	_Frequencies above ___________ kHz are called radio frequencies$?
A.	2
B.	10
C.	50
D.	200
Answer» E.

Discussion

176.	_The Q of an LC circuit is given by ___________$?
A.	2pfr x R
B.	R / 2pfrL
C.	2pfrL / R
D.	R2/2pfrL
Answer» D. R2/2pfrL

Discussion

177.	_ICEO = () ICBO$?
A.	‚àö√º
B.	1 + a
C.	1 + ‚àö√º
D.	none of the above
Answer» D. none of the above

Discussion

178.	The leakage current in CE arrangement is ___________ that in CB arrangement$?
A.	more than
B.	less than
C.	the same as
D.	none of the above
Answer» B. less than

Discussion

179.	An ideal value of stability factor is ___________$?
A.	100
B.	200
C.	More than 200
D.	1
Answer» E.

Discussion

180.	A tuned amplifier is generally operated in ___________ operation$?
A.	Class A
B.	Class C
C.	Class B
D.	None of the above
Answer» C. Class B

Discussion

181.	Transistor biasing is done to keep ___________ in the circuit$?
A.	Proper direct current
B.	Proper alternating current
C.	The base current small
D.	Collector current small
Answer» B. Proper alternating current

Discussion

182.	In parallel resonance, the circuit impedance is ___________$?
A.	C/LR
B.	R/LC
C.	CR/L
D.	L/CR
Answer» E.

Discussion

183.	The dimensions of L/CR are that of ___________$?
A.	Farad
B.	Henry
C.	Ohm
D.	None of the above
Answer» D. None of the above

Discussion

184.	BC 147 transistor indicates that it is made of ___________$?
A.	germanium
B.	silicon
C.	carbon
D.	none of the above
Answer» C. carbon

Discussion

185.	The emitter of a transistor is ___________ doped$?
A.	lightly
B.	heavily
C.	moderately
D.	none of the above
Answer» C. moderately

Discussion

186.	The Q of a tuned circuit refers to the property of ___________$?
A.	Sensitivity
B.	Fidelity
C.	Selectivity
D.	None of the above
Answer» D. None of the above

Discussion

187.	At series resonance, the phase angle between applied voltage and circuit is ___________$?
A.	90¬¨‚àû
B.	180¬¨‚àû
C.	0¬¨‚àû
D.	None of the above
Answer» D. None of the above

Discussion

188.	At series or parallel resonance, the circuit behaves as a ___________ load$?
A.	Capacitive
B.	Resistive
C.	Inductive
D.	None of the above
Answer» C. Inductive

Discussion

189.	A tuned amplifier uses ___________ load$?
A.	Resistive
B.	Capacitive
C.	LC tank
D.	Inductive
Answer» D. Inductive

Discussion

190.	The zero signal IC is generally ___________ mA in the initial stages of a transistor amplifier$?
A.	4
B.	1
C.	3
D.	More than 10
Answer» C. 3

Discussion

191.	The input impedance of a transistor is ___________$?
A.	high
B.	low
C.	very high
D.	almost zero
Answer» C. very high

Discussion

192.	For germanium transistor amplifier, VCE should ___________ for faithful amplification$?
A.	Be zero
B.	Be 0.2 V
C.	Not fall below 0.7 V
D.	None of the above
Answer» D. None of the above

Discussion

193.	The operating point ___________ on the a.c. load line$?
A.	Also line
B.	Does not lie
C.	May or may not lie
D.	Data insufficient
Answer» B. Does not lie

Discussion

194.	The disadvantage of voltage divider bias is that it has ___________$?
A.	High stability factor
B.	Low base current
C.	Many resistors
D.	None of the above
Answer» D. None of the above

Discussion

195.	The Q of a tuned amplifier is generally ___________$?
A.	Less than 5
B.	Less than 10
C.	More than 10
D.	None of the above
Answer» D. None of the above

Discussion

196.	At series resonance, the phase angle between applied voltage and circuit is ___________?
A.	90¬¨‚àû
B.	180¬¨‚àû
C.	0¬¨‚àû
D.	None of the above
Answer» D. None of the above

Discussion

197.	The Q of a tuned circuit refers to the property of ___________?
A.	Sensitivity
B.	Fidelity
C.	Selectivity
D.	None of the above
Answer» D. None of the above

Discussion

198.	A tuned amplifier uses ___________ load?
A.	Resistive
B.	Capacitive
C.	LC tank
D.	Inductive
Answer» D. Inductive

Discussion

199.	At series or parallel resonance, the circuit behaves as a ___________ load?
A.	Capacitive
B.	Resistive
C.	Inductive
D.	None of the above
Answer» C. Inductive

Discussion

200.	The input impedance of a transistor is ___________?
A.	high
B.	low
C.	very high
D.	almost zero
Answer» C. very high

Discussion

Explore topic-wise MCQs in Electrical Engineering.

_ In a transistor amplifier circuit VCE = VCB + ___________$?

_ In voltage divider bias, operating point is 3 V, 2 mA. If VCC = 9 V, RC = 2.2 k≈í¬©, what is the value of RE ?$?

_ The phase difference between the input and output voltages in a common base arrangement is ___________$?

_ Tuned class C amplifiers are used for RF signals of ___________$?

_ In a pnp transistor, the current carriers are ___________$?

__In the double tuned circuit, if the mutual inductance between the two tuned circuits is decreased, the level of resonance curve _____________

__At series or parallel resonance, the circuit power factor is _____________

__If a high degree of selectivity is desired, then double-tuned circuit should have ___________ coupling__

__A tuned amplifier is used in ___________ applications__

__Transistor biasing is generally provided by a _____________

__IC = [a / (1 - a )] IB + [ / (1 - a )]__

__Double tuned circuits are used in ___________ stages of a radio receiver__

__For proper operation of the transistor, its collector should have _____________

__The value of ‚àö√º for a transistor is generally _____________

_At parallel resonance, the line current is ___________$?

_The circuit that provides the best stabilization of operating point is ___________$?

_As the temperature of a transistor goes up, the base emitter resistance ___________$?

_For frequencies above the resonant frequency, a parallel LC circuit behaves as a ___________ load$?

_The value of a of a transistor is ___________$?

_In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then ___________$?

_In a base resistor method, if the value of ‚àö√º changes by 50, then collector current will change by a factor$?

_The voltage gain of a tuned amplifier is ___________ at resonant frequency$?

_IC = aIE + ___________$?

_The base resistor method is generally used in$?

_Frequencies above ___________ kHz are called radio frequencies$?

_The Q of an LC circuit is given by ___________$?

_ICEO = () ICBO$?

The leakage current in CE arrangement is ___________ that in CB arrangement$?

An ideal value of stability factor is ___________$?

A tuned amplifier is generally operated in ___________ operation$?

Transistor biasing is done to keep ___________ in the circuit$?

In parallel resonance, the circuit impedance is ___________$?

The dimensions of L/CR are that of ___________$?

BC 147 transistor indicates that it is made of ___________$?

The emitter of a transistor is ___________ doped$?

The Q of a tuned circuit refers to the property of ___________$?

At series resonance, the phase angle between applied voltage and circuit is ___________$?

At series or parallel resonance, the circuit behaves as a ___________ load$?

A tuned amplifier uses ___________ load$?

The zero signal IC is generally ___________ mA in the initial stages of a transistor amplifier$?

The input impedance of a transistor is ___________$?

For germanium transistor amplifier, VCE should ___________ for faithful amplification$?

The operating point ___________ on the a.c. load line$?

The disadvantage of voltage divider bias is that it has ___________$?

The Q of a tuned amplifier is generally ___________$?

At series resonance, the phase angle between applied voltage and circuit is ___________?

The Q of a tuned circuit refers to the property of ___________?

A tuned amplifier uses ___________ load?

At series or parallel resonance, the circuit behaves as a ___________ load?

The input impedance of a transistor is ___________?

In the double tuned circuit, if the mutual inductance between the two tuned circuits is decreased, the level of resonance curve ___________

At series or parallel resonance, the circuit power factor is ___________

If a high degree of selectivity is desired, then double-tuned circuit should have _______ coupling

A tuned amplifier is used in _______ applications

Transistor biasing is generally provided by a ___________

IC = [a / (1 - a )] IB + [ / (1 - a )]

Double tuned circuits are used in _______ stages of a radio receiver

For proper operation of the transistor, its collector should have ___________

The value of ‚àö√º for a transistor is generally ___________